Tiny sesame sea slug species discovered in the waters of northern Taiwan

This tiny nudibranch, which measures less than three millimetres in length, was first spotted by lead author Ho-Yeung Chan during a recreational dive in 2019.

Translucent, speckled, and barely the size of a grain of rice, a new species of sea slug has been identified in the coastal waters of Keelung, Taiwan. Because of its minute size and distinctive black and yellow markings, researchers from National Taiwan Ocean University, National Museum of Natural Science and National Taipei University of Education have named the creature Thecacera sesama.

“Taiwanese divers call it ‘sesame’ in Chinese and it is also small like a sesame seed, hence the name,” the research team explained regarding their decision to honour the local nickname in the scientific nomenclature. This tiny nudibranch, which measures less than three millimetres in length, was first spotted by lead author Ho-Yeung Chan during a recreational dive in 2019.

Thecacera sesama sp. nov. Details of appearance and morphological features, hand-drawn on a tablet PC by Chen-Lu Lee. 

The discovery was a stroke of luck that began during Chan’s undergraduate studies:

“During a recreational dive in the summer during the undergraduate study of HY Chan in 2019, he accidentally discovered Thecacera sesama sp. nov. in northern Taiwan waters.”

The Research Team

Despite its unique appearance, the importance of the find was not immediately obvious. In a modern twist on traditional taxonomy, Chan “never realised Thecacera sesama was a new species until he consulted the sea slug expert ‘Hsini Lin teacher’ on Facebook.”

Living specimens of Thecacera sesama sp. nov. Image credit: Ho-Yeung Chan et al.

Documenting the species proved to be a significant logistical feat due to the volatile environment of the Keelung coast. The research team noted that the most challenging part of the study was the unique weather conditions of the region.

Taiwan experiences frequent typhoons in the summer and large waves during the winter monsoon season, with sea temperatures often dropping below 16 degrees Celsius. These factors mean that diving for nudibranch research is only possible for about four months of the year, making sightings of such tiny creatures entirely a matter of chance.

Living specimens of bryozoan with Thecacera species. Image credit: Ho-Yeung Chan et al.

The life of T. sesama is remarkably focused, as the researchers observed that the species exhibits only four primary behaviours: feeding, searching, mating, and laying eggs on bryozoans, which are tiny aquatic invertebrates often called “moss animals”. Interestingly, the specific bryozoan that T. sesama calls home may itself be a species new to science.

From a broader ecological perspective, these vibrant molluscs play a vital role in the marine environment:

“Nudibranchs are one of the key players in the marine food web. They are extremely colourful and can be spotted on coral reef ecosystems. However, many nudibranchs are very small in size and are extremely difficult to spot underwater with the naked eye.”

The Research Team

The researchers believe that the discovery of T. sesama is just the tip of the iceberg for Taiwanese marine biology. Because many species are so small, many more are likely awaiting discovery and formal study. The full research on Thecacera sesama was published in the open-access journal ZooKeys on 11 May 2026.

Original source:

Chan H-Y, Lee C-L, Chen W-C, Chang C-H, Shao Y-T, Pang K-L (2026) Thecacera sesama sp. nov. (Nudibranchia, Polyceridae) from Taiwan, evident from morphology and phylogenetic analyses of the 16S rDNA and cytochrome c oxidase I gene. ZooKeys 1279: 269-284. https://doi.org/10.3897/zookeys.1279.184298

Cover image:

Two individuals of Thecacera sesama sp. nov. feeding on a bryozoan. Image credit: Ho-Yeung Chan et al.

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Remote fieldwork and museum collections reveal hidden pit viper diversity in High Asia 

Published in ZooKeys, a recent study revises the Himalayan pit viper group using a combination of fresh and historical DNA, morphology, skeletal anatomy, and ecological observations.

The high mountain ranges of Asia remain among the least biologically explored regions of the continent. Now, an international team of researchers has shown that one of their most elusive venomous snakes, long treated a single species, is in fact a complex of five distinct species, three of which are new to science.

Published in the open-access journal ZooKeys, the study revises the Himalayan pit viper group using a combination of fresh and historical DNA, morphology, skeletal anatomy, and ecological observations. The data reveals that what scientists had long treated as a single widespread species, the Himalayan pit viper first described in 1864, actually consists of multiple deeply distinct evolutionary lineages.

The analyses identified five clearly distinct species-level lineages, i.e. the Himalayan pit viper in the strict sense, Gloydius chambensis described in 2022, and three previously unrecognised species from different parts of Pakistan and Nepal. Alongside genetic divergence, these lineages exhibit distinct morphological and skeletal variations.

Phylogeny and distribution of five pit viper species in the Himalaya and Hindu Kush. Image credit: Dr Daniel Jablonski

“These mountain systems still harbour overlooked vertebrate diversity and hold important clues to the biogeography of Asia,” says Daniel Jablonski of Comenius University Bratislava, who has been conducting extensive research in Pakistan and Afghanistan for many years.

“By combining modern field sampling with data from historical museum specimens, we uncovered evolutionary lineages that had remained hidden for more than a century after the original description of the Himalayan pit viper.”

Daniel Jablonski

A key element of the discovery was the integration of newly collected material with a powerful source of evidence: DNA extracted from museum specimens collected in the 19th and early 20th centuries. This included the original type specimen of the Himalayan pit viper, allowing the researchers to clarify the identity of the species in its strict scientific sense.

The study underscores the enduring scientific value of natural history collections. Indeed, specimens gathered by earlier generations of explorers and preserved in museums are still helping scientists solve modern biological puzzles, especially in regions where fieldwork remains difficult.

In fact, part of the discovery had been waiting in plain sight. “Museum specimens are not just records of the past. They are active research tools and essential infrastructure for future science,” says Sylvia Hofmann from the Museum Koenig as part of the Leibniz Institute for the Analysis of Biodiversity Change, who has comprehensively worked in the Himalaya and Tibetan Plateau during the past 20 years.

“Some of the key evidence had been sitting in museum collections for more than a hundred years. We just didn’t have the tools to recognise it. As analytical methods continue to improve, the scientific value of these collections will only grow and revealing biodiversity we didn’t even know was there.”

Sylvia Hofmann

Representatives of the herpetofauna play an important role in the ecosystem, particularly as ecological indicators, within the food chain, and as predators in pest control. A group of top predators in the region consist of pit vipers adapted to mountainous environments, which have so far been studied only very inadequately in the Himalayan region.

“Our work aims to close these gaps in knowledge and to lay the groundwork and provide inspiration for further, in-depth studies on this ecologically and medically relevant group.”

Frank Tillack of the Museum für Naturkunde Berlin, Leibniz Institute for Evolution and Biodiversity Research

Tillack maintains close ties with Nepalese colleagues and has been collaborating with them for 35 years on projects concerning the biodiversity of herpetofauna in the Himalaya.

An important part of the study is the osteology of these snakes, including the skull anatomy of the lectotype BMNH 1946.1.19.64 of Gloydius himalayanus, collected more than 160 years ago.
Image credit: Kristin Mahlow-Tillack.

The study also emphasises how much remains to be discovered in regions that have long been difficult to access for scientific research. “Pakistan’s high mountains are still full of biological surprises,” says Rafaqat Masroor of the Pakistan Museum of Natural History, the country’s leading herpetologists.

“This finding highlights how little we still know about a region long shaped by socio-political instability.”

Rafaqat Masroor

Beyond taxonomy, the findings also carry an important conservation message:

“Each of the newly recognised species seems to occupy a relatively restricted range in fragile mountain environments, highlighting new ecological and evolutionary questions.”

Daniel Jablonski

Without recognising such diversity, it would be impossible to assess it accurately or protect it effectively.

Original study:

Jablonski D, Tillack F, Mahlow-Tillack K, Petzold A, Wilzo M, Das A, Idrees M, Baniya CB, Masroor R, Hofmann S (2026) Integrative taxonomy reveals previously undescribed diversity within the Gloydius himalayanus complex (Squamata, Viperidae, Crotalinae) from the Himalaya and Hindu Kush. ZooKeys 1280: 83-153. https://doi.org/10.3897/zookeys.1280.182768

New “Happy-Face” Spider Species Discovered in the Indian Himalayas

For over a century, this cheerful-looking creature was thought to be a unique resident of the Hawaiian Islands.

Vibrant, tiny, and sporting a bright red grin on its back, the Happy-Face spider is one of the most famous and recognisable arachnids in the world. For over a century, this cheerful-looking creature was thought to be a unique resident of the Hawaiian Islands, a biological curiosity found nowhere else on Earth. 

When researchers from the Forest Research Institute and the Regional Museum of Natural History discovered a new species of spider with the same unmistakable smile in the montane mountains of Uttarakhand, India, they knew exactly what to call it: Theridion himalayana, the Himalayan Happy-Face Spider. 

Mature male (left) and female (right) of Theridion himalayana sp. nov. Photo credit: Devi Priyadarshini and Ashirwad Tripathy.

“The discovery was accidental because our survey was [originally] on ants. But my co-author [Ashirwad Tripathy] kept sending me spiders from high altitude regions for identification.

So, one fine day, when he shared this image from the underside of a Daphniphyllum leaf, I froze in shock because I had seen the Hawaiian spider during my master’s programme itself, and I knew instantly we had a jackpot because of its striking resemblance.

I asked him to send all morphs that he found, and that led to the discovery in the next few months, from October 2023 onwards.”

Devi Priyadarshini, Regional Museum of Natural History, Bhubaneswar

Priyadarshini added that she was always interested in exploring high-altitude spiders because the landscape and vegetation are so different there than in the plains:

“This almost came across as a gateway to look at other polymorphic species from this region.”

Ashirwad also said that we could find more variations in the species if the surveys could be done extensively.

Nest architecture of Theridion himalayana. Photo credit: Devi Priyadarshini and Ashirwad Tripathy.

The species name, himalayana, serves as a tribute to the mountain range where the spider was found at elevations of over 2,000 meters above sea level.

“The name Himalayana was decided as the species name because we both wanted to pay our respects to the mighty Himalaya mountain ranges, which have been standing tall not just guarding our country but also holding a plethora of biodiversity within them.

Since this spider was the first polymorphic from this region, we decided to make it an ode to the amazing mountain ranges.”

Ashirwad Tripathy, Forest Research Institute, Dehradun
Theridion himalayana sp. nov. Photo credit: Devi Priyadarshini and Ashirwad Tripathy.

The research, published in the open-access journal Evolutionary Systematics, identified 32 different colour variations, or “morphs”, of the species collected from three locations in Uttarakhand: Makku, Tala, and Mandal. DNA analysis revealed a genetic variation of approximately 8.5% from the Hawaiian happy-face spider, confirming it as a separate lineage that evolved independently in Asia. 

Different “morphs” of Theridion himalayana sp. nov. Photo credit: Devi Priyadarshini and Ashirwad Tripathy.

While the smiling patterns are striking, their exact purpose remains a mystery.

“The reason behind the expression of polymorphism is also very complex and unique.

These patterns definitely help them survive better in the wild, which is understood prima facie, but why do they resort to such patterns on their back, and what functional role in their life cycle does it exactly serve is yet to be deciphered. This is definitely indicative of a deeper genetic mystery.”

Priyadarshini

Ashirwad also mentioned that the spider species was surrounded by critters which had similar colour patterns on their body.

Subadult female with Psocid (booklice) prey. Photo credit: Devi Priyadarshini and Ashirwad Tripathy.

The study additionally noted that these spiders are frequently found on ginger plants (Hedychium species), mirroring the behaviour of their Hawaiian cousins. Since ginger is not native to Hawaii, the researchers are intrigued by the evolutionary connection.

“How did the spiders choose an invasive species and ginger exactly? If T. himalayana is an elder cousin of T. grallator, although discovered 125 years later!

Although this sounds like a tall claim now, it will be  our further scope of work to establish any missing links, if at all, through Hedychium sps.”

Priyadarshini
Showing the prey of T. himalayana sp. nov. Video credit: Devi Priyadarshini and Ashirwad Tripathy.

Original source:

Tripathy A, Priyadarshini D (2026) On the discovery of a new polymorphic Happy-Face Spider (Araneae, Theridiidae) from the Western Himalayas, India, with notes on its natural history. Evolutionary Systematics 10(1): 63-84. https://doi.org/10.3897/evolsyst.10.174338

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Celebrating Deep Day with Incredible Deep-Sea Research

Protecting the deep sea, the largest and least explored habitat on Earth, requires collaborative effort.

May 7th marks Deep Day, a global day of awareness and action dedicated to the deep sea. Founded by the Deep Sea Conservation Coalition, it aims to raise awareness of the deep sea’s immense ecological importance and call for its protection against threats like deep-sea mining and destructive fishing.

To celebrate the wonders of our oceans and raise awareness of the incredible biodiversity of the deep sea, we at Pensoft Publishers would like to highlight some of the remarkable marine studies that have recently been published in our scientific journals.

A Global Collaboration to Uncover Deep-Sea Amphipods

24 deep-sea amphipods
The 24 newly described deep-sea amphipod species. Image credit to: Eleanor Frost, National Oceanography Centre

Demonstrating the power of global teamwork, an international group of experts recently discovered 24 new deep-sea amphipod species in the central Pacific Ocean’s Clarion-Clipperton Zone (CCZ). Researchers from institutions worldwide, including the University of Lodz and the National Oceanography Centre, came together for a coordinated taxonomy workshop to achieve this. Their work revealed a completely new evolutionary branch with the discovery of a new superfamily, Mirabestioidea.

Crucially, their findings form part of the International Seabed Authority’s Sustainable Seabed Knowledge Initiative (SSKI) and its ‘One Thousand Reasons’ project, which aims to formally describe 1,000 new species by the end of the decade.

Highlighting the importance of this joint effort, Dr. Anna Jażdżewska from the University of Lodz shared:

This was a truly collaborative process that allowed us to achieve the ambitious goal of describing more than 20 species new to science within a year – something that would not have been possible if each of us worked independently. The team’s findings provide information that is crucial for future conservation and policy decisions.

Learn more in the Special Issue: New deep-sea Amphipoda from Clarion-Clipperton Zone

What lives 10 km below the surface?

@pensoft.publishers

😯Fascinating new #study recorded 108 morphotaxa from 4,500m down to the #hadal depths of 9,775m, revealing the hidden life of the NW Pacific trenches. 🎥They analyzed 460 hours of video from landers & submersibles across the Japan, Ryukyu, and Izu-Ogasawara trenches. 👇Full study here: https://doi.org/10.3897 /BDJ.14.e182172 📗You can read all about it on Pensoft’s blog 👇 https://blog.pensoft.net/2026/04/06/what-lives-10-km-below-the-surface-a-new-look-at-life-in-japans-deepest-ocean-trenches/ Research center: Minderoo-UWA Deep-Sea Research Centre. Main funders of the expedition: Inkfish, Caladan Oceanic #deepsea #sciencetok #research

♬ THE MOON – Camargguinho
Photo and video credit to Minderoo-UWA Deep-Sea Research Centre, Inkfish, Caladan Oceanic, Jamieson et al., 2026

Another recent expedition provided a profound look at life up to nearly 10 kilometers below the surface in the Japan, Ryukyu, and Izu-Ogasawara trenches, cataloging at least 108 distinct organism groups. The research captured rare footage of species interactions at extreme depths – and one baffling, unidentified animal that has left taxonomists worldwide perplexed.

Animalia incerta sedis
The unknown organism or Animalia incerta sedis. Credit to Jamieson et al., 2026, o Minderoo-UWA Deep-Sea Research Centre, Inkfish and Caladan Oceanic.

Rather than using traditional trawls that can damage fragile organisms, the team utilized crewed submersibles and free-fall baited landers. Explaining the value of this non-destructive method, the research team noted:

This combination enabled us to build the most comprehensive visual baseline yet for abyssal and hadal megafauna in the Northwest Pacific to date.

They added that the study aims to establish a foundation for the future, emphasizing that:

More than anything, the hadal zone remains one of Earth’s least-explored and most intriguing frontiers.

Learn more: Jamieson AJ, Swanborn DJB, Bond T, Cundy MC, Fujiwara Y, Lindsay D, Stott MS, Kitazato H (2026) Faunal biodiversity of the lower abyssal and hadal zones of the Japan, Ryukyu and Izu-Ogasawara trenches (NW Pacific Ocean; 4534-9775 m). Biodiversity Data Journal 14: e182172. https://doi.org/10.3897/BDJ.14.e182172

The Internet Names a New Deep-Sea Chiton

Ferreiraella populi
Ferreiraella populi on woodfall. Image credit to ©ChongChen/JAMSTEC

Finally, highlighting a unique way the public can engage with science and taxonomy, a recently found deep-sea chiton was named by the internet after science YouTuber Ze Frank featured it in an episode of his “True Facts” series. Originally discovered in 2024 within the Izu-Ogasawara Trench at a depth of 5,500 meters, this new species belongs to the genus Ferreiraella, a rare and specialized group of mollusks that live exclusively on sunken wood in the deep sea.

From over 8,000 suggestions submitted across social media, the research team selected the name Ferreiraella populi. The epithet populi is a Latin singular noun in the genitive case meaning “of the people”.

Prof. Dr. Julia Sigwart, co-chair of the Senckenberg Ocean Species Alliance (SOSA), emphasized the broader significance of this public discovery:

Ferreiraella populi exemplifies the overwhelming biodiversity of the oceans, the vast majority of which remains unexplored. Many species go extinct before we even know they exist – this is especially true for marine invertebrates.

Learn more: (SOSA) SOSA, Chen C, Frank H, Kraniotis L, Nakadera Y, Schwabe E, Sigwart JD, Trautwein B, Vončina K (2026) Ocean Species Discoveries 28–30 — new species of chitons (Mollusca, Polyplacophora) and a public naming competition. Biodiversity Data Journal 14: e180491. https://doi.org/10.3897/BDJ.14.e180491 

@pensoft.publishers

Happy #DeepDay ! Started by Deep Sea Conservation Coalition, this annual day is aimed at raising awareness to the incredible diversity in our deep seas. Today, we’re sharing with you three remarkable studies from our journals – each one a window into a fascinating world, hoping to raise awareness and inspire action to #DefendtheDeep . 👇𝐎𝐮𝐫 𝐛𝐥𝐨𝐠: https://blog.pensoft.net/…/celebrating-deep-day-with…/ 🔎By analysing 460 hours of video from landers and submersibles across the Japan, Ryukyu, and Izu-Ogasawara trenches, researchers found something extraordinary: a mysterious organism so unusual it was classified as Animalia incerta sedis! 📗𝐑𝐞𝐚𝐝 𝐭𝐡𝐞 𝐟𝐮𝐥𝐥 𝐬𝐭𝐮𝐝𝐲 𝐩𝐮𝐛𝐥𝐢𝐬𝐡𝐞𝐝 𝐢𝐧 Biodiversity Data Journal (𝐁𝐃𝐉) 𝐡𝐞𝐫𝐞: https://doi.org/10.3897/BDJ.14.e182172 Cc: Minderoo-UWA Deep-Sea Research Centre at The The University of Western Australia, JAMSTEC: Japan Agency for Marine-Earth Science and Technology, Inkfish, Caladan Oceanic LLC 🎥Footage credit: Minderoo-UWA Deep-Sea Research Centre, Inkfish, Caladan Oceanic, Jamieson et al., 2026 After thousands of name suggestions from the public, the “chiton of the people” has been officially described in Biodiversity Data Journal. 🙌A huge thank you to everyone who voted and participated! Cc: True Facts Senckenberg Senckenberg Ocean Species Alliance – SOSA 🎥Footage credit: ©ChongChen/JAMSTEC 𝐅𝐮𝐥𝐥 𝐚𝐫𝐭𝐢𝐜𝐥𝐞 𝐢𝐧 𝐁𝐃𝐉: https://doi.org/10.3897/BDJ.14.e180491 🦐24 new deep-sea amphipods discovered in the Clarion Clipperton Zone. Through an international collaboration – with key momentum from a 2024 taxonomic workshop at Uniwersytet Łódzki – researchers described 24 new species of amphipods from the central Pacific abyss. 𝐀𝐜𝐜𝐞𝐬𝐬 𝐚𝐥𝐥 𝐭𝐡𝐞 𝐩𝐮𝐛𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬 𝐢𝐧 ZooKeys: https://zookeys.pensoft.net/issue/4856/ See less #deepsea #deepocean #sciencetok

♬ Fantasy in an Immersive World – Ernesto P. Neto

These studies highlight the vastness of the unexplored frontier that our deep seas and oceans offer. Revealing this hidden life – from entirely new evolutionary branches of amphipods to records of unknown organisms – requires global collaboration, cutting-edge exploration technologies, and the involvement of the general public.

Ultimately, this shared pursuit of discovery provides the fundamental knowledge crucial for conservation and policy decisions. As Deep Day reminds us of the encroaching threats from deep-sea mining, human-derived debris, and destructive fishing, we must work together to understand these fragile habitats so that we can effectively protect them and #DefendtheDeep.

For more curious research follow Pensoft Publishers’ socials: Facebook, Bluesky, Instagram, TikTok, LinkedIn and X.

New ‘Ecclesiastical’ Moth named after Pope Leo XIV

Described as Pyralis papaleonei, the finding serves as a powerful call for biodiversity conservation, inspired by a biblical reference.

Distinguished by its striking colors and a name that carries the weight of a high ecclesiastical office, a new species of moth has been discovered in the rugged terrain of Greece. When researchers from the Tyrolean State Museum, the Finnish Museum of Natural History and the Bavarian State Collection of Zoology identified this unique insect in the White Mountains of Crete, they chose a name that reflects both its noble appearance and a message of environmental hope: Pyralis papaleonei – derived from “Papa Leone” (Pope Leo).

The discovery, published in the open-access journal Nota Lepidopterologica on 28 April 2026, highlights that even among such conspicuous European moths, overlooked species remain to be discovered. The new species is currently only known from the White Mountains (Lefka Ori) in the western part of Crete, where it appears to be an endemic treasure of the island.

Type-locality of Pyralis papaleonei sp. nov. (Greece, Crete, Omalos plateau). Image credit: Peter Huemer.

Striking purple forewings

The so-called Pope Leo Moth has a wingspan of around two centimeters, placing it among the medium-sized representatives of its group. Its most distinctive features are its purple forewings with an orange-golden patch and prominent white bands. The moths were recorded at artificial light sources and appear to be mainly active in June. So far, little is known about the biology and lifestyle of the new species. It was distinguished from related species based on classical morphological characteristics – such as wing pattern, coloration, and genital morphology – as well as genetic fingerprinting. Molecular analyses revealed a divergence of around six percent from its closest relative, clearly indicating that it represents a distinct species.

Pyralis papaleonei sp. nov., holotype. Image credit: Peter Huemer.

A tradition of remarkable species names

Butterflies and moths are often named after physical characteristics, geographic origins, or in honor of distinguished individuals. Within the genus Pyralis, however, a particular tradition can be observed: as early as 1775, Austrian naturalists Michael Denis and Ignaz Schiffermüller described the first species of the group as Pyralis regalis (“royal”), inspired by its splendid coloration. This was followed by sonorous names such as Pyralis princeps and Pyralis cardinalis, also referring to the remarkable beauty of these moths.

All these species belong to the diverse superfamily Pyraloidea, which comprises around 16,000 described species worldwide and represents one of the largest groups among micro-moths.

Specimen of Pyralis regalis. Image credit: Peter Huemer.

Taxonomy as the “first profession” of humankind

The naming of living organisms also has a cultural-historical dimension: in the Old Testament (Genesis 2), Adam is firstly tasked with naming all animals. In this sense, taxonomy – the science of classifying, naming, and organising organisms – can be regarded as one of humanity’s earliest endeavors.

For study leader Peter Huemer of the Tyrolean State Museum Ferdinandeum, naming a species is therefore more than a formal scientific act: it also serves as a symbolic appeal to the head of the Catholic Church, Pope Leo XIV, to highlight humanity’s central responsibility in safeguarding creation. This is particularly fitting as butterflies and moths are regarded in Christianity as symbols of resurrection, transformation (metamorphosis), and the immortal soul.

Specimens of Pyralis papaleonei. Image credit: Peter Huemer.

Only a fraction of global biodiversity documented

Peter Huemer, former head of the Natural Science Collections at the Tyrolean State Museums and now a volunteer researcher, explains:

“We are facing a global biodiversity crisis, yet only a fraction of the world’s species has been scientifically documented. Effective conservation of biodiversity requires that species are first recognised, described, and named.”

Around 700 new moth species are described each year, primarily in the tropics. However, fundamental research in Europe is far from complete: in the Alps alone, approximately 200 previously unknown species have been identified in recent decades.

With their internationally significant scientific collections, the Tyrolean State Museums make an important contribution to this work. The discovery of the Pope Leo Moth, Pyralis papaleonei, highlights how much remains to be discovered even in well-studied regions of Europe—and underscores the urgent need to protect sensitive habitats.

Original source:

Huemer P, Kaila L, Segerer AH (2026) Pyralis papaleonei sp. nov. from Crete (Greece) (Lepidoptera, Pyralidae). Nota Lepidopterologica 49: 63-74. https://doi.org/10.3897/nl.49.185483

For more interesting articles on lepidopterology, follow Nota Lepidopterologica on Bluesky and Facebook.

Inside the Hidden World of Spider-Attacking Fungi

Newly discovered groups of “zombie” fungi have been found to mummify spiders and adapt their physical forms.

Deep within the humid leaf litter of China and the dense canopies of Brazil’s Atlantic Forest, a silent ambush unfolds. 

While we often think of spiders as the ultimate predators of the undergrowth, they have an arch-nemesis: araneopathogenic fungi. These “zombie” fungi are capable of parasitising spiders by hijacking their bodies and consuming them from the inside out.

Two studies published in the open-access peer-reviewed scientific journals MycoKeys and IMA Fungus, respectively, offer insight into this macabre world of spider assassins.

In Southeast Asia, researchers led by Chen-xin Chang of the Guizhou University of Traditional Chinese Medicine have identified three new species of Gibellula fungi in China and Laos, which erupt from spiders in branch-like structures: Gibellula pseudopigmentosa, Gibellula pseudosolita, and Gibellula sinensis. These species are distinguished from one another by their slight variations in sexual reproductive structures and morphology. The below figure displays morphological plates, showing the three fungi species at both a macroscopic and microscopic level – notice their unique conidial heads and spore arrangements, coloured in blue.

To identify new species of spider-pathogenic fungi, the research group conducted field surveys in the forest leaf of China and Laos, where they collected specimens for detailed laboratory study. A combination of traditional microscopy and modern DNA sequencing rendered the discovery possible. The fungi’s sighting in Laos is particularly significant because it provides the first formal record of the Gibellula genus in the region. 

This study – published in MycoKeys – therefore serves to fill a major distributional gap in Southeast Asia, as well as expand our understanding of the morphological diversity within this group of spider-pathogenic fungi.

Meanwhile, in Brazil, a study led by Joao Paulo Machado De Araújo of the University of Copenhagen and the Royal Botanic Gardens of Kew, published in IMA Fungus, described a new species of Purpureocillium fungus belonging to the Purpureocillium atypicola group: Purpureocillium atlanticum. This fungus specifically targets trapdoor spiders inhabiting burrows on the forest floor, where it mummifies the host in white mycelia and subsequently emerges from its cephalothorax in the form of a purple fruiting body. 

The discovery was notably featured in The Guardian, where it was placed alongside other unusual botanical and fungal discoveries compiled by the Royal Botanic Gardens, Kew.

Phylogeny of hypocrealean fungi (A), highlighting the Purpureocillium atypicola complex (B) and morphology of the new species, P. atlanticum (C–G). Photo credit: Araújo et al.

Purpureocillium atypicola was originally recorded in Japan by Yasuda (1894), and was thought to be a single species found all over the world for over a century. The discovery of the Purpureocillium atlanticum in Brazil is significant because it finally confirms that Purpureocillium atypicola is actually a global complex of many unique species. 

To identify this new fungus, De Araújo’s research group used taxogenomics, a method which entailed bringing portable DNA sequencing gear directly into the Brazilian rainforest. By analysing the genetic code of the fungus and its environment immediately in the field, they were able to identify the specimen within just four days as opposed to waiting months for traditional lab results.

Both of these studies highlight the impressive diversity of spider-pathogenic fungi across distinct global environments. They additionally reveal the different evolutionary strategies of their respective species – while Purpureocillium atlanticum has adapted to infect underground trapdoor spiders by producing purple stalks to escape burrows, the Gibellula species represent the most diverse genus of spider parasites, found primarily in forest debris. 

As researchers continue to map these complex ecological networks, it becomes clear that preserving threatened biomes, including the Atlantic Forest and the jungles of Southeast Asia, is critical to expanding our knowledge in fungal taxonomy.

Original studies: 

Araújo JPM, Przelomska NAS, Smith RJ, Drechsler-Santos ER, Alves-Silva G, Martins-Cunha K, Hosoya T, Luangsa-ard JJ, Perrigo A, Repullés M, Matos-Maraví P, Woods R, Pérez-Escobar OA, Antonelli A (2025) A new species of Purpureocillium (Ophiocordycipitaceae) fungus parasitizing trapdoor spiders in Brazil’s Atlantic Forest and its associated microbiome revealed through in situ “taxogenomics”. IMA Fungus 16: e168534. https://doi.org/10.3897/imafungus.16.168534

Chang C-xin, Chen H, Loinheuang C, Dai Y-dong, Wang Y (2026) Morphological and phylogenetic analyses reveal three new species of Gibellula (Cordycipitaceae, Hypocreales) from spiders. MycoKeys 127: 135-154. https://doi.org/10.3897/mycokeys.127.177871

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Remarkable Bat Discoveries from the ZooKeys Archives

These discoveries, ranging from a species rediscovered after a century to new regional records, emphasise the impressive diversity of bats.

Bats are nocturnal mammals that are critical to healthy ecosystems around the globe; they act as pollinators, seed dispersers, and natural pest controllers. In honour of Bat Appreciation Day (17 April), we are highlighting some of the most interesting bats published in our open-access journal ZooKeys.

The following discoveries, ranging from a species rediscovered after a century to new regional records, emphasise the remarkable diversity of bats and the ongoing efforts of researchers to understand and protect them.

The Strange Big-eared Brown Bat (Histiotus alienus)

Adult male of Histiotus alienus, captured on the municipality of Palmas, Paraná state, Brazil. (Image credit: Cláudio et al.).

For over a hundred years, the strange big-eared brown bat was known only from a single specimen collected in Uruguay in 1916. This elusive species remained unseen by the scientific community for a century, leading to significant uncertainty regarding its biology and true distribution.

However, a study led by Brazilian researchers documents the rediscovery of this bat in the Palmas Grasslands of southern Brazil, providing the first confirmed record for the country. This finding significantly expands the known range of the species and offers researchers the first opportunity to provide a detailed redescription.

Histiotus alienus is distinguished by its large and oval ears that are connected by a low skin fold. Its fur is a deep, dark brown on the back, while the underside is slightly paler. The rediscovery occurred in a unique landscape characterised by high-altitude grasslands and Araucaria forests, a habitat that is increasingly threatened by human activity.

Learn more: Cláudio VC, Almeida B, Novaes RLM, Navarro MA, Tiepolo LM, Moratelli R (2023) Rediscovery of Histiotus alienus Thomas, 1916 a century after its description (Chiroptera, Vespertilionidae): distribution extension and redescription. ZooKeys 1174: 273-287. https://doi.org/10.3897/zookeys.1174.108553

The Flat-skulled Woolly Bat (Kerivoula depressa)

Kerivoula depressa. (Image credit: Liang et al.).

The world of bat taxonomy is constantly shifting as researchers use new tools to differentiate species that look nearly identical. Another study formally documents the first records of the flat-skulled woolly bat, Kerivoula depressa, in China.

Previously, many woolly bats in the region were grouped together under other names, but detailed morphological and genetic analysis confirmed that K. depressa is a distinct part of the Chinese fauna, specifically in Guangdong and Yunnan provinces.

The defining feature of this species is its notably flattened braincase. This physical trait is an evolutionary adaptation that allows the bat to roost in very narrow spaces, such as the hollow internodes of bamboo. The bat has woolly fur that ranges from buff brown to dark brown, and it is relatively small in size.

The presence of this specialist bat in China highlights the complexity of tropical forest ecosystems and the need for further taxonomic work to correctly identify and conserve local biodiversity.

Learn more: Liang X, Xie H, Li Y, Huang Z, Li S, Wu Y, Yu W (2023) First record of the flat-skulled woolly bat Kerivoula depressa and the Indochinese woolly bat K. dongduongana (Chiroptera, Vespertilionidae) in China. ZooKeys 1149: 1-15. https://doi.org/10.3897/zookeys.1149.85821

The Lesser False Vampire Bat (Megaderma spasma)

Megaderma spasma. (Image credit: Cook-Price et al.).

Islands often host a high number of unique species, yet their mammalian populations are frequently understudied. A comprehensive survey on Ko Pha-ngan, an island off the coast of Thailand, identifies the lesser false vampire bat, Megaderma spasma, as a new record for the island.

This species is a member of a group known for their distinctive appearance and predatory habits. While its name might sound ominous, it does not feed on blood; instead, it preys on insects and occasionally small vertebrates.

The lesser false vampire bat is easily recognised by its exceptionally large ears that are joined at the base and the absence of a visible external tail. During the survey, researchers found this species in a variety of environments, including national park forests, disturbed forest fragments, and areas with human settlements.

The discovery of M. spasma and eighteen other new records on Ko Pha-ngan demonstrates the importance of conducting biodiversity surveys in tourist-heavy regions to inform better conservation policies.

Learn more: Cook-Price DR, Petko ON, Makchai S, Artchawakom T, Suwanwaree P (2025) Mammal diversity survey of Ko Pha-ngan in Surat Thani Province, Thailand. ZooKeys 1229: 77-102. https://doi.org/10.3897/zookeys.1229.118127

The Grey-bellied Dwarf Dog-faced Bat (Molossops griseiventer)

Details specimen of Molossops temminckii. (Image credit: Ramírez-Chaves et al.).

Some species remain hidden until scientists take a closer look at existing museum collections and genetic data. For years, the grey-bellied dwarf dog-faced bat was considered a synonym of the more common Molossops temminckii. However, a recent revision has revalidated Molossops griseiventer as a separate species.

This grey-bellied dwarf dog-faced bat can be identified by its characteristic greyish ventral fur and specific cranial proportions. Beyond its appearance, the revalidation of this species has major implications for its protection. Unlike its more widespread relatives, M. griseiventer is restricted to the inter-Andean valleys of Colombia, a region heavily impacted by agricultural development.

Because it is now recognised as an endangered species, conservationists can advocate for specific protections for its remaining habitat. This case proves that understanding the true diversity of bats is a prerequisite for effective conservation.

Learn more: Ramírez-Chaves HE, Morales-Martínez DM, Martínez-Medina D, Ossa-López PA, Rivera-Páez FA (2023) Revising the diversity within the Dwarf Dog-faced Bat, Molossops temminckii (Chiroptera, Molossidae), with the revalidation of the endangered Molossops griseiventer. ZooKeys 1180: 237-256. https://doi.org/10.3897/zookeys.1180.109091

The stories of these four species remind us that our understanding of biodiversity is always evolving. Through continued exploration and open-access publishing, we can better appreciate and protect the bats that share our planet.

Once again, Happy Bat Appreciation Day from ZooKeys and Pensoft Publishers!

For more articles on zoology, visit the ZooKeys website and follow the journal on BlueSky and Facebook.

Meet the Crevice Weaver: A Newly Discovered Urban Spider from Colombia

The Pikelinia floydmuraria, a new addition to the South American Pikelinia population, was observed in Colombia’s department of Tolima and is now described in the journal Zoosystematics and Evolution.

A team of researchers from institutions across South America have expanded scholarly knowledge of the Pikelinia spider genus, with their recent discovery of a new crevice weaver species: Pikelinia floydmuraria.

The new species name is a creative tribute to the legendary rock band Pink Floyd, while simultaneously referencing the spider’s specific habitat. “Muraria,” derived from the Latin word for “wall”, reflects the species’ tendency to reside in the walls of buildings, though indeed also alludes to the iconic Pink Floyd album, The Wall.

These findings are described in greater detail in the open-access journal Zoosystematics and Evolution (ZSE) and serve as a particularly important contribution to the wider study of synanthropic spiders – species that have adapted to human-created environments. Despite the ecological importance of these spiders in Colombia, research into their biology and nutritional ecology has received little attention. The discovery of the Pikelinia floydmuraria, alongside observations of additional populations in neighbouring Colombian departments, holds the potential to remedy this problem.

The species establishment

The first regional review of the genus Pikelinia was established in 1946 by the Brazilian zoologist Mello-Leitão. For decades, the genus remained obscure, with species often misidentified or “lumped” into the type genus Filistata, most commonly found in the Mediterranean region.

In 2022, however, a major study redefined Pikelinia as part of a distinct South American spider group. Pikelinia floydmuraria is the most recent addition to the genus and provides considerable insight into the dietary composition of these crevice weavers.

Skilled hunters

These spiders are skilled hunters, primarily feeding on insects including flies, beetles and ants. Remarkably, they are capable of taking down prey up to six times their own size and often build their webs near streetlights to catch insects attracted to the glow. The above figure provides a visual representation of the spider’s predatory behaviour in urban habitats, demonstrating its ability to prey on insects larger than itself.By keeping these insect populations under control, crevice weavers thus maintain a healthier balance in the Colombian urban environment.

The research team behind this discovery, led by Osvaldo Villarreal and Leonardo Delgado-Santa, note that Pikelinia floydmuraria only measure about 3 to 4 millimetres in length. One of their most unique internal features is found in the females, which contain reproductive organs comprising long and slender tubes that are shaped like the letter “S”. In urban environments, they can be found tucked in the cracks and crevices of building walls, with observed concentrations reaching between 20 and 30 spiders in a single square metre.

Pikelinia fasciata, female from Galapagos A. Habitus (dorsal view).  Credit: Andrea C. Roman.

The researchers further observed that Pikelinia floydmuraria is a very close relative of another species called Pikelinia fasciata, which lives in the Galapagos Islands. Despite being separated by the Pacific Ocean and Andes mountain range, the two look almost exactly alike, leaving scientists to wonder: how did such similar spiders end up so far apart? It remains a mystery as to whether these traits reflect shared ancestry or similar ecological adaptations.

Nonetheless, the two can be differentiated by the appearance of their legs, with the Colombian spider displaying solid-colours, and the Galapagos featuring darker rings by contrast. The Galapagos female spiders additionally have shorter and straighter reproductive organs in comparison to the Colombian female.

Further research needed

@pensoft.publishers

🎸🕸️ Meet the latest rock star of the #spider world: Pikelinia floydmuraria. 🕷️Recently discovered in Colombia, this species was officially named after @Pink Floyd as a tribute to both their iconic album “The Wall” and the spider’s favourite hangout: urban city walls. ➡️ Follow the link to read more about this discovery: https://zse.pensoft.net/article/175423/ ➡️Or see the blog post here: https://blog.pensoft.net/2026/04/14/meet-the-crevice-weaver-a-newly-discovered-urban-spider-from-colombia/ #arachnid #spiders #newspecies #science

♬ original sound – Pensoft Publishers

In order to better determine whether Pikelinia floydmuraria is a unique species native to Colombia, the South American researchers suggest the implementation of DNA barcoding in future studies. This will provide genetic evidence that could help map the evolutionary history of Pikelinia floydmuraria. A DNA-based dietary analysis, meanwhile, would quantify the extent to which these spiders operate as natural urban pest regulators.

Whether they are just “another web in the wall” or a relative from the Galapagos, the discovery of Pikelinia floydmuraria represents a significant advancement in our understanding of South American spider taxonomy. By identifying this new Colombian species and providing the first-ever detailed anatomical description for its relative, Pikelinia fasciata, researchers have expanded scientific knowledge of the Pikelinia genus.

Pikelinia floydmuraria may be small and “comfortably numb” to the bustle of the city, but their impact on maintaining a healthy urban ecosystem is anything but quiet.

Original source

Villarreal O, Delgado-Santa L, González-Gómez JC, Rodríguez-Castro GA, Román AC, Agudelo E, García LF (2026) Another web in the wall: A new Pikelinia Mello-Leitão, 1946 (Araneae, Filistatidae) from Colombia, with notes on its diet and description of the female genitalia of P. fasciata (Banks, 1902). Zoosystematics and Evolution 102(1): 357-366. https://doi.org/10.3897/zse.102.175423

Two New Gecko Species Discovered in Vietnam, One Named After Herpetologist Prof. Dr. Thomas Ziegler

Two new species of half leaf-fingered geckos have been discovered in Vietnam, one was named in honor of the renowned herpetologist Prof. Dr. Thomas Ziegler.

Guest blog post by Minh Duc Le

The half leaf-fingered geckos (Hemiphyllodactylus) are a diverse group with more than 70 recognized species and a distribution range from southern India and Sri Lanka, through Indochina and Southeast Asia, to the western Pacific region.

As a result of its cryptic lifestyle and small body size, its diversity had been neglected until a recent surge of integrative taxonomic research, which combines different lines of evidence, most importantly molecular and morphological data.

Over the last ten years, more than 60 members of the genus (~85% of its diversity) have been newly described. Vietnam is a hot spot for new species discoveries with at least 10 congeners uncovered in recent years, including H. banaensis, H. bonkowskii, H. cattien, H. dalatensis, H. lungcuensis, H. nahangensis, H. ngocsonensis, H. vanhoensis, H. yenchauensis, and H. zugi.

Male Hemiphyllodactylus ziegleri. Photo credit to Anh Van Pham.

A newly published paper in ZooKeys reveals another new species within Hemiphyllodactylus, Hemiphyllodactylus ziegleri, from Copia Nature Reserve, Son La Province, northwestern Vietnam.

The new species is currently known only from this protected area, established in 2002. Although its range is estimated at less than 50 km², the area has been experiencing severe habitat degradation, primarily as a result of road construction and timber logging.

Left ImageRight Image

The new species honours Prof. Dr. Thomas Ziegler, a world-class herpetologist and conservation biologist of Cologne Zoo and the University of Cologne, who has made remarkable contributions to biodiversity research and conservation in Southeast Asia, especially to its the herpetofauna. Prof. Ziegler was involved in the descriptions of seven Hemiphyllodactylus species from Vietnam.

In addition to his more than three decades of engagement in taxonomic and ecological studies – spanning lizards, snakes, turtles, salamanders, frogs, and other vertebrates and invertebrates – Prof. Ziegler has made substantial contributions across herpetology broadly.

More recently, he has actively developed in-situ and ex-situ conservation measures to safeguard some of Vietnam’s most endangered species, including the Crocodile Lizard (Shinisaurus crocodilurus), the Vietnamese Knobby Newt (Tylototriton vietnamensis), the Cat Ba Leopard Gecko (Goniurosaurus catbaensis), and the Vietnamese Pond Turtle (Mauremys annamensis).

As for Hemiphyllodactylus, the current taxonomy is believed to substantially underestimate its diversity, especially in the karst ecosystem, as recent discoveries demonstrate that this particular habitat harbors a high number of cryptic species.

Adult male Hemiphyllodactylus pakhaensis. Credit to Ha HB et al., 2026

Coinciding with the publication of H. ziegleri, another karst-dwelling species – H. pakhaensis from Son La Province – was reported in ZooKeys. These discoveries bring the total species count to 12, suggesting that additional surveys in remote areas of the country and elsewhere in Southeast Asia will likely reveal many new congeners and highlight the importance of this unique, but highly imperiled ecosystem.

Original sources

Pham AV, Nguyen TQ, Pham CT, Ngo HT, Le MD (2026) Hemiphyllodactylus ziegleri sp. nov. (Squamata, Gekkonidae), a new karst-dwelling gecko species from Son La Province, Vietnam. ZooKeys 1268: 75-94. https://doi.org/10.3897/zookeys.1268.174678

Ha HB, Hoang TT, Nguyen MD, Ha NV, Luu VQ (2026) A new species of Hemiphyllodactylus Bleeker, 1860 (Squamata, Gekkonidae) from Son La Province, Vietnam. ZooKeys 1268: 163-188. https://doi.org/10.3897/zookeys.1268.177040

Revisiting Acalypha: Integrating global knowledge and taxonomy for drug discovery

This diverse genus of flowering plants holds significant medicinal relevance, and yet remains considerably understood.

Guest Blog Post by Lucía Villaescusa-González and Pablo Muñoz-Rodríguez

Since the first humans learned to distinguish the plant that cured a fever from the one that caused a funeral, we have amassed an extraordinary amount of information about the natural world. Whether used for food, medicine, or shelter, this ethnobotanical knowledge passed down through generations now serves as the foundation for modern experimental research.

Today, researchers explore the world’s plant chemical diversity seeking new compounds and species of medicinal or economic interest. However, discovering these resources and sharing the information effectively depends on one often-overlooked key: naming things correctly.

Taxonomy ensures that, when researchers identify a promising use of a plant, the rest of the scientific community can find that plant again, replicate the results, and build upon them. In a time of accelerated biodiversity loss, taxonomy provides the framework that allows us to document biodiversity and connect knowledge about species before they are lost.

For nearly two decades, our research group has focused on Acalypha, a remarkably diverse genus of flowering plants with approximately 450 species. It is the third largest genus in the family Euphorbiaceae —the same as cassava, poinsettia or the rubber tree— yet many aspects of its biology remain poorly understood. While numerous studies have pointed to the medicinal relevance of Acalypha, the information has historically been scattered across disconnected sources and regions.

Acalypha mollis growing at the Naciones Unidas National Park in Guatemala. Author: Gandhi Ponce Juárez – iNaturalist, CC0 licence (https://www.inaturalist.org/observations/234908619)

To fully explore a plant group’s potential, we must ensure our knowledge is organised and reliable. This is precisely where taxonomy becomes powerful. In a study recently published in PhytoKeys, we compiled, revised, and standardised existing knowledge about Acalypha uses published worldwide between 1816 and 2024.

Our review, published in the open-access journal PhytoKeys, revealed that nearly 25% of the studies we analysed contained at least one taxonomic error. These errors ranged from the use of non-existent names and already outdated synonyms at the time of publication to “impossible” data, such as species allegedly collected for research in countries thousands of kilometres away from their known distribution range.

By verifying every scientific name against current standards, we were able to provide the first standardised, reliable global synthesis of the genus. Furthermore, this process allowed us to clear the “noise” from the literature and identify exactly which species hold the most promise for future research.

Geographical distribution of Acalypha ethnobotanical knowledge. Top: number of studies with ethnobotanical information per country. Bottom: number of species with reported medicinal uses per country. Darker colours indicate higher values. Author: Villaescusa-González et al.

A clearer global picture

Once we brough this information together under a robust taxonomic framework, a much clearer picture of Acalypha medicinal uses emerged. We identified 62 species with documented medicinal uses across 55 countries. While the genus is used globally, pharmacological research is heavily concentrated in India, Nigeria, and Mexico.

In contrast, species-rich countries such as Brazil and Madagascar, with over 40 species each, remain significantly underrepresented. Also, while many species are used locally, a few are globally relevant: Acalypha indica, for example, is used to treat 23 different disease categories, while Acalypha wilkesiana, a common ornamental plant, is linked to 18 disease categories.

Our work revealed that these plants are used not just for human medicine; they are used in veterinary medicine, as pesticides targeting disease-carrying insects, and in ritual contexts. In human health, they most frequently target infectious and parasitic diseases, digestive tract issues, and respiratory symptoms.

Finally, we also detected a big gap between traditional use and modern research: of all species recorded in ethnobotanical surveys, 36 have never been studied in a laboratory. They represent a promising avenue for future research and drug discovery.

Acalypha argomuelleri, a shrub growing in the Peruvian Andes. Author: Pablo Muñoz-Rodríguez

Why this matters for the future

­The relationship between ethnobotany and experimental biology is widely recognised, and taxonomy plays a key role in bridging these fields. Accurate taxonomic knowledge is essential for ensuring scientific discovery and reproducibility.

When experimental research investigates plants that have been incorrectly identified, it leads to the perpetuation of errors in scientific literature. If pharmacological results are based on misidentified specimens, those experiments cannot be replicated, potentially misleading years of subsequent, expensive medical research.

Glandular hairs in Acalypha ecklonii, a species from Southern Africa. Author: Emma Ortúñez & Roberto Gamarra.

By integrating scattered ethnobotanical reports into a standardised, taxonomically reliable system, we wanted to provide a reliable map for all future Acalypha research. This study proves that precise identification is the basis of scientific discovery.

In an era of accelerated biodiversity loss, applying taxonomy to organise and validate the data we have today ensures the discovery of the medicines of tomorrow.

Original source

Villaescusa-González L, Cardiel JM, Montero-Muñoz I, Muñoz-Rodríguez P (2026) Revisiting Acalypha medicinal interest: ethnobotany, experimental studies, and the implications of taxonomic misuse pitfalls. PhytoKeys 270: 119-142. https://doi.org/10.3897/phytokeys.270.169087

Don’t forget to also keep yourself up-to-date with the latest discoveries described in PhytoKeys by signing up for the journal newsletter from the PhytoKeys homepage. You can also follow the journal on BlueSky and Facebook.