Tag: arachnids

From science to literature: New arachnid taxa named after Gabriela Mistral and Pablo Neruda

A taxonomic revision describes 22 new species, with two of the names honoring prominent figures of Chilean culture.

Guest blog post by Willians Porto and Abel Pérez González

The third-largest group of arachnids, in terms of number of known species, is the harvestmen, with nearly 7,000 described species, ranking just behind spiders and mites. Despite this number, a considerable portion of their diversity is unknown, and many species still remain undescribed.

An individual of Fresiax spinulosa in a natural setting. — Fresiax spinulosa. Photo by Abel Pérez-González

The harvestmen of the family Triaenonychidae comprise 404 known species and have a peculiar distribution. They are found in temperate regions of the southern hemisphere, with representatives in Australia, New Zealand, South Africa, Madagascar, and southern South America— a typical temperate Gondwana distribution. In the America continent, the diversity is concentrated in the Southern Cone of South America, mainly in the Chilean Valdivian Forest, where 26 species were previously recorded.

A map of Chile showing the distribution of 16 harvestman species. — Distribution maps for 27 harvestman species in Chile.

A map of Chile showing the distribution of Lautaria ceachei. — Distribution maps for 27 harvestman species in Chile.

In our latest work published in ZooKeys, we present the result of a taxonomic and systematic revision of the South American triaenonychids previously included in the mainly New Zealand genus Nuncia. After examining hundreds of specimens, we redescribed all the four previously known species and described 22 new ones. All these species were included in six genera─one resurrected and five new to science─regarding the genus Nuncia as exclusively to New Zealand. The new systematic arrangement was supported by a comprehensive new phylogenetic analysis based on molecular (UCE + Sanger) data.

An individual of Laftrachia robin in a natural environment. — Laftrachia robin, one of the new species described in the study. Photo by Abel Pérez-González

The proposed phylogenetic hypothesis reveals the relationships between South American Triaenonychidae and their counterparts from the rest of the world, indicating that the diversity of triaenonychids in the Southern Cone is polyphyletic, reflecting an ancient diversification predating the Gondwana breakup.

A brown spider in a natural environment. — A species of the newly described Nerudiella genus. Photo by Abel Pérez-González

A bust of Chilean poet Pablo Neruda. — A bust of Pablo Neruda. Photo by Wally Gobetz under a CC BY-NC-ND 2.0 license

Our work represents the most comprehensive contribution to the taxonomy and systematic of South American triaenonychids, almost doubling the number of previously known species. For naming the new taxa, we select names derived from geography, historical figures, and recognized intellectuals. Since most of the newly discovered fauna is distributed across various regions of Chile, the authors decided to honor two prominent figures of Chilean literature. The poet Gabriela Mistral (1889-1957), Nobel laureate in literature in 1945, was honored with the new genus Mistralia, and Pablo Neruda (1904-1973), Nobel laureate in literature in 1971, was honored with the new genus Nerudiella. In addition to tributes to globally renowned Chilean poets, the new species also include dedications to members of the arachnological scientific community and researchers who collaborated on this work.

The taxonomic revision includes hundreds of images that are extremely important for species identification. These images consist of various optical microscopy, stereomicroscopy, and numerous scanning electron microscopy micrographs.

Scanning electron microscope image showing detailed views of the male genitalia of Mistralia verrucosa. — Scanning electron microscope image showing various detailed views of the male genitalia of Mistralia verrucosa.

This work is one of the products of years of collaboration between the Arachnology Division of the Museo Argentino de Ciencias Naturales Bernardino Rivadavia (MACN) and the Giribet Lab in Harvard University and Museum of Comparative Zoology (MCZ). It also represents a continuation of the collaboration initiated in the 20th century by the late Argentinean arachnologist Emilio Maury (MACN) with the Chilean zoologist Tomás Nicolás Cekalovic (Museo de Zoología de la Universidad de Concepción) and the American Museum of Natural History.

Research article:

Porto W, Derkarabetian S, Giribet G, Pérez-González A (2024) Systematic revision of the South American “Nuncia” (Opiliones, Laniatores, Triaenonychidae). ZooKeys 1207: 1-149. https://doi.org/10.3897/zookeys.1207.120068

A new species of rare pseudoscorpion named after the Slovak president

Olpium caputi, named after Zuzana Čaputová, was discovered on the island Tahiti in French Polynesia

There are about 25,000 islands in the Pacific Ocean. The most remote of them are in North and East Polynesia, the Hawaiian Islands, and French Polynesia. Biologists have been attracted to these regions since the 18th century, but French Polynesia has received much less attention compared to the Hawaiian Islands.

A view of the area where *Olpium caputi* was found. Photo by Frédéric A. Jacq

Contributions to our knowledge of the pseudoscorpions of French Polynesia date from the 1930s and are associated with the Pacific Entomological Survey. Since then, the French Polynesian pseudoscorpion fauna has consisted of only four known species.

Thanks to international cooperation, a team of enthusiastic scientists has published the first discovery of a new species of pseudoscorpion from French Polynesia. Between 2017 and 2020, they studied French Polynesia’s fauna and environment for the French Polynesian Agricultural Service and as a part of a large-scale survey of arthropods. During their research work, they collected a few pseudoscorpion specimens on Huahine and Tahiti in the Society Islands.

Among them is a new species named Olpium caputi, collected by sieving moss at 1,450 m about sea level on the Mont Marau Summit, Tahiti, one of the Society Islands archipelago. Its scientific name honours Zuzana Čaputová, the President of Slovakia.

Zuzana Čaputová. Photo by Jindřich Nosek (NoJin) under a CC BY-SA 4.0 license.

“As a female leader, she takes a strong stance and supports women and scientists. Even in the 21st century, women in science or top positions are rare. The rarity of the research in French Polynesia, the uniqueness of the discovery, and the fact that the new species is a female, led us to name it after this inspiring woman who can be a role model of courage and perseverance for many women,” says Jana Christophoryová, who led the study.

The paper is published in the open-access, peer-reviewed journal ZooKeys.

The team:

Katarína Krajčovičová of Bratislavské regionálne ochranárske združenie – BROZ, Bratislava, and Jana Christophoryová of Comenius University, Bratislava, are both zoologists, who specialize in the taxonomy, distribution, and ecology of pseudoscorpions. Frédéric Jacq, botanist, and Thibault Ramage, entomologist, are independent naturalists who have been working on improving the faunistic and taxonomic knowledge of French Polynesia for over 15 years.

Research article:

Krajčovičová K, Ramage T, Jacq FA, Christophoryová J (2024) Pseudoscorpions (Arachnida, Pseudoscorpiones) from French Polynesia with first species records and description of new species. ZooKeys 1192: 29-43. https://doi.org/10.3897/zookeys.1192.111308

For peace in Colombia: a new genus and five new species of pseudoscorpions

Looking into biological collections, pseudoscorpion researcher Catalina Romero-Ortiz found five new species and a new genus of these interesting creatures.

Guest blog post by Catalina Romero-Ortiz

Colombia is a South American country full of beautiful landscapes, indigenous cultures, delicious food, and warm people. In its territory, the country hosts an amazing diversity of birds, amphibians, vascular plants, fishes, among other biological groups, which makes it one of the biodiversity hotspots on Earth. The nation’s recent steps toward peace have allowed for the exploration of regions previously off-limits due to conflict.

A map showing the location of Colombia. Screenshot from OpenStreetMap.

Of all this diversity in Colombia, pseudoscorpions, little arachnids that resemble scorpions, are very little known. They can get mistaken for mites or fleas due to their size, but are entirely harmless to humans, with their venom glands only used for hunting and self-defense. Their cryptic behaviors make them difficult to find, which in turn makes them difficult to study. For a biodiversity hotspot like Colombia, researchers expect that there are more species out there than the 63 that are already known to science.

Looking into biological collections, pseudoscorpion researcher Catalina Romero-Ortiz found five new species and a new genus of these interesting creatures. Together with Dr. Mark Harvey from the Western Australian Museum and Dr. Carlos Sarmiento from the Instituto de Ciencias Naturales of the National University of Colombia, they recently described those findings in the scientific journal ZooKeys. They also proposed a new classification for a species that was only known by its description, contributing to the broader understanding of pseudoscorpions in Colombia. The star of their research is the newfound genus Paciwithius.

Newly described pseudoscorpion species: A Paciwithius chimbilacus, B Cystowithius florezi, C Parawithius bromelicola, D Oligowithius achagua. Scale bars: 0.5 mm.

A peculiar name

To understand the meaning of the genus name, which refers to the Latin for peace, pax, we should look at the history of this beautiful country. Since the early 20th century, Colombia has grappled with an ongoing civil conflict, particularly in rural areas. Starting in 1946 with the rise of the Guerrilla, this historic period named “La Violencia” claimed millions of lives. Over the years, the dynamics of the conflict evolved, but violence persisted. The 1980s witnessed the rise of the narco-era, plunging the entire nation into a vortex of violence. With the emergence of paramilitary forces vying for control of the drug trade, violent clashes with guerrillas further escalated the bloodshed.

In 2012, peace negotiations began in Colombia, and in 2016 the Peace agreement with the biggest Guerrilla group was established. Prior to this, a process of reconciliation was initiated with paramilitary groups. With the perception that for a true peace there has to be a comprehensive understanding of past events in order to forgive, the “Comisión de la verdad” (Truth commission) was created. This Commission did incredible work gathering testimonials of the war from all sides and making them accessible to the public. Remembering is essential to healing and moving on.

The signed peace agreement. Photo by FAOAmericas used under a CC BY-NC-SA 2.0 license

In the end, peace for this country has a lot to do with people, territory, and biodiversity. Areas that were previously unexplored due to violence are now accessible, and although war is far from over, this is a good path to follow. A long one, but, we hope, full of life.

Research article:

Romero-Ortiz C, Sarmiento CE, Harvey MS (2023) A new genus and five new species of pseudoscorpions (Arachnida, Pseudoscorpiones, Withiidae) from Colombia. ZooKeys 1184: 301-326. https://doi.org/10.3897/zookeys.1184.106698

Persian Gold Tarantula: a new species from Iran for Tarantula Appreciation Day 2023

Its “woolly, golden hairs” were one of the features so unique it was not necessary for additional individuals to be collected

Guest blog post by Dr Alireza Zamani (@Arachno_AZ)

In the latest issue (1174^th) of the scientific open-access journal ZooKeys, you can find our paper describing a new species of tarantula (family Theraphosidae) found in northwestern Iran.

This species belongs to Chaetopelma, a relatively small genus, distributed in Crete, Sudan, and the Middle East, and one of the only two tarantula genera inhabiting the Mediterranean region.

Our discovery is significant for several reasons. Firstly, it marks the first record of this genus in Iran and the third known species of tarantulas in this country. Additionally, it extends the known range of Chaetopelma spiders by almost 350 km eastwards.

We named this species Chaetopelma persianum, paying homage to its occurrence in Iran, which has historically been known as Persia. As a potential common name, we suggest “Persian Gold Tarantula”, where we are also making a reference to the “woolly, golden hairs’’ on its carapace.

The newly described tarantula species (*Chaetopelma persianum*) seen in a defensive posture.
Photo by Kari Kaunisto.

For the purpose of our study, we only had one specimen: a female with a leg span of almost 9 cm, available. Yet, its distinct characteristics allowed us to confidently differentiate it from other known Chaetopelma species.

This tarantula is an obligate burrower and inhabits high elevations in well-vegetated mountainous regions of the northern Zagros Mountains. The holotype specimen was collected from a self-made ground burrow on sloped rocky ground, amidst sparse low vegetation and grasses.

It all started with local nature enthusiast Mehdi Gavahyan, who photographed a wandering male and sent me the photo. When I figured it was most likely an undescribed species, I asked him to team up with Amir Hossein Aghaei, a nature enthusiast and a friend of mine, and send me specimens of these spiders for further examination. Unfortunately, they only managed to collect that one female. However, it turned out to be enough for us to describe the Persian Gold Tarantula!

Additionally, thanks to local citizen scientists and naturalists, we later also got hold of photos of another two males of the same genus, taken very close to the type locality of the new species: one in Sardasht in West Azerbaijan Province of Iran, and the other in the surroundings of Sulaymaniyah in Iraq. While it is highly probable that both these males belong to Ch. persianum, this cannot be confirmed until further examination of collected material from both sexes is conducted.

_{Burrow of Persian Gold Tarantulas in West Azerbaijan Province, Iran. The arrow in the photo on the right indicates the location of the burrow. Photos by Amir Hossein Aghaei.}

During our research, we also noted that one species of Chaetopelma described from Cameroon is misclassified and should be transferred to another genus. However, this transfer is pending until the type material undergoes examination.

Looking ahead, we believe that more comprehensive investigations employing integrative methods would greatly benefit the taxonomy of Chaetopelma.

Habitat of the newly described Persian Gold Tarantula (*Chaetopelma persianum*) in West Azerbaijan Province, Iran.
Photo by Amir Hossein Aghaei.

For example, Ch. olivaceum, a species with seven junior synonyms and one of the broadest ranges within the entire family, covering an area of approximately 1,493,978 km², might potentially have cryptic species within its range. Moreover, the disjunct distribution of Ch. olivaceum in Turkey, where it occurs both in the southern regions and as far north as Istanbul, raises the possibility of distinct species status for the latter population, which is geographically isolated from the rest of the recorded occurrences. Integrative studies incorporating molecular data could offer insights into this.

Additionally, further collection efforts in lesser-sampled or completely unexplored regions, such as Saudi Arabia, Syria, Iraq, eastern Turkey and western Iran, could lead to the discovery of additional Chaetopelma species or records. These findings would be instrumental in gaining a more comprehensive understanding of the taxonomy and distribution of this genus.

Research paper:

Zamani A, West RC (2023) A new species of Chaetopelma Ausserer, 1871 (Araneae, Theraphosidae) from Iran. ZooKeys 1174: 75-84. https://doi.org/10.3897/zookeys.1174.109135

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As uniform as cloned soldiers, new spiders were named after the Stormtroopers in Star Wars

*One of the newly described bald-legged spider species Stormtropis muisca. It is also the highest altitudinal record for the family. Image by Carlos Perafan.*

The new species are amongst the very first bald-legged spiders recorded in Colombia

Despite being widely distributed across north and central South America, bald-legged spiders had never been confirmed in Colombia until the recent study by the team of Drs Carlos Perafan and Fernando Perez-Miles (Universidad de la Republica, Uruguay) and William Galvis (Universidad Nacional de Colombia). Published in the open-access journal ZooKeys, their research paper describes a total of six previously unknown species inhabiting the country.

Four of the novel spiders were unable to fit into any already existing genus, so the scientists had to create a brand new one for them, which they called Stormtropis in reference to the Star Wars‘ clone trooper army known as Stormtroopers.

Considered to be amongst the most enigmatic in the group of mygalomorphs, the bald-legged spiders are a family of only 11 very similarly looking, small- to medium-sized species, whose placement in the Tree of Life has long been a matter of debate. In fact, it is due to their almost identical appearance and ability for camouflage that became the reason for the new bald-legged spider genus to be compared to the fictional clone troopers.

One of the most striking qualities of the bald-legged spiders (family Paratropididae) is their ability to adhere soil particles to their cuticle, which allows them to be camouflaged by the environment.

*A bald-legged spider of the genus Paratropis in its natural habitat. Image by Carlos Perafan.*

“The stormtroopers are the soldiers of the main ground force of the Galactic Empire. These soldiers are very similar to each other, with some capacity for camouflage, but with unskillful movements, like this new group of spiders,” explain the researchers.

“We wanted to make a play on words with the name of the known genus, Paratropis, and of course, we also wanted to pay tribute to one of the greatest sagas of all time”, they add.

One of the new ‘stormtrooper’ species (Stormtropis muisca) is also the highest altitudinal record for the family. It was recorded from an elevation of at least 3,400 m in the central Andes. However, the authors note that they have evidence of species living above 4,000 m. These results are to be published in future papers.

In the course of their fieldwork, the researchers also confirmed previous assumptions that the bald-legged spiders are well adapted to running across the ground’s surface. The spiders were seen to stick soil particles to their scaly backs as a means of camouflage against predators. More interestingly, however, the team records several cases of various bald-legged species burrowing into ravine walls or soil – a type of behaviour that had not been reported until then. Their suggestion is that it might be a secondary adaptation, so that the spiders could exploit additional habitats.

In conclusion, not only did the bald-legged spiders turn out to be present in Colombia, but they also seem to be pretty abundant there. Following the present study, three genera are currently known from the country (Anisaspis, Paratropis and Stormtropis).

*A bald-legged spider (Paratropis elicioi) in its natural habitat. Image by Carlos Perafan.*

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Original source:

Perafan C, Galvis W, Perez-Miles F (2019) The first Paratropididae (Araneae, Mygalomorphae) from Colombia: new genus, species and records. ZooKeys 830: 1-32. https://doi.org/10.3897/zookeys.830.31433

New tarantula species from Angola distinct with a one-of-a-kind ‘horn’ on its back

A new to science species of tarantula with a peculiar horn-like protuberance sticking out of its back was recently identified from Angola, a largely underexplored country located at the intersection of several Afrotropical ecoregions.

Collected as part of the National Geographic Okavango Wilderness Project, which aims to uncover the undersampled biodiversity in the entire Okavango catchment of Angola, Namibia and Botswana, thereby paving the way for sustainable conservation in the area, the new arachnid is described in a paper published in the open-access journal African Invertebrates by the team of Drs John Midgley and Ian Engelbrecht.

Although the new spider (Ceratogyrus attonitifer sp.n.) belongs to a group known as horned baboon spiders, the peculiar protuberance is not present in all of these species. Moreover, in the other species – where it is – the structure is completely sclerotised, whereas the Angolan specimens demonstrate a soft and characteristically longer ‘horn’. The function of the curious structure remains unknown.

The new tarantula’s extraordinary morphology has also prompted its species name: C. attonitifer, which is derived from the Latin root attonit– (“astonishment” or “fascination”), and the suffix –fer (“bearer of” or “carrier”). It refers to the astonishment of the authors upon the discovery of the remarkable species.

“No other spider in the world possesses a similar foveal protuberance,” comment the authors of the paper.

*Individual of the newly described species in defensive posture in its natural habitat. Photo by Kostadine Luchansky.*

During a series of surveys between 2015 and 2016, the researchers collected several female specimens from the miombo forests of central Angola. To find them, the team would normally spend the day locating burrows, often hidden among grass tufts, but sometimes found in open sand, and excavate specimens during the night. Interestingly, whenever the researchers placed an object in the burrow, the spiders were quick and eager to attack it.

The indigenous people in the region provided additional information about the biology and lifestyle of the baboon spider. While undescribed and unknown to the experts until very recently, the arachnid has long been going by the name “chandachuly” among the local tribes. Thanks to their reports, information about the animal’s behaviour could also be noted. The tarantula tends to prey on insects and the females can be seen enlarging already existing burrows rather than digging their own. Also, the venom of the newly described species is said to not be dangerous to humans, even though there have been some fatalities caused by infected bites gone untreated due to poor medical access.

In conclusion, the researchers note that the discovery of the novel baboon spider from Angola does not only extend substantially the known distributional range of the genus, but can also serve as further evidence of the hugely unreported endemic fauna of the country:

“The general paucity of biodiversity data for Angola is clearly illustrated by this example with theraphosid spiders, highlighting the importance of collecting specimens in biodiversity frontiers.”

Apart from the described species, the survey produced specimens of two other potentially new to science species and range expansions for other genera. However, the available material is so far insufficient to formally diagnose and describe them.

*The newly described baboon spider species (Ceratogyrus attonitifer), showing the peculiar soft and elongated horn-like protuberance sticking out of its back. Photo by Dr Ian Enelbrecht.*

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Original source:

Midgley JM, Engelbrecht I (2019) New collection records for Theraphosidae (Araneae, Mygalomorphae) in Angola, with the description of a remarkable new species of Ceratogyrus. African Invertebrates 60(1): 1-13. https://doi.org/10.3897/afrinvertebr.60.32141

Out of the darkness: A new spider found deep within an Indiana cave

Lead author Marc Milne in the Stygian River Cave and a male specimen of the newly described *Islandiana lewisi*

Spiders are ubiquitous within our forests, fields, and backyards. Although you may be used to seeing the beautiful yellow and black spiders of the genus Argiope in your garden, large ground-scurrying wolf spiders in your yard, or spindly cellar spiders in your basement, this new sheet-web-building spider is probably one you haven’t seen before. The reason is that it’s known from a single cave in the world, Stygeon River Cave, in southern Indiana.

The University of Indianapolis assistant professor, Dr. Marc Milne, described the rare species in the open access journal Subterranean Biology with the help of a University of Indianapolis alumnus, Elizabeth Wells, who illustrated the spider for the manuscript.

Sheet weavers, also known as dwarf spiders or money spiders, are minute creatures growing no larger than a few centimetres in length, which makes them particularly elusive. Their peculiar webs are flat and sheet-like, hence their common English name.

Female of the new species *Islandiana lewisi*

The new spider, Islandiana lewisi, is an homage. Milne was shown the spider by a fellow scientist, Dr. Julian Lewis, who noticed the critter on one of his many cave expeditions. In appreciation for his help, Milne and Wells named the spider after Lewis.

This is the fifteenth species in its genus (Islandiana) and the fifth known to live exclusively in caves. It has been over 30 years since the last species has been added to this group.

At about 2 mm in size, Islandiana lewisi is thought to feed on even smaller arthropods, such as springtails living in the debris on the cave floor. It is unknown when it reproduces or if it exists anywhere else. The spider is likely harmless to humans.

The collectors of the spider, Milne and Lewis, described the hostile conditions within the cave, which the new species calls home: “because the cave floods from time to time, the insides were wet, muddy, slippery, and dangerous to walk on without the proper equipment.”

Milne and Lewis found the spider in small, horizontal webs between large, mud-caked boulders in the largest room in the cave. It was collected in October 2016 with the permission of the landowner.

Milne hypothesized that he had collected something special, stating, “I didn’t know what the spider was at first, I just thought it was odd that so many were living within this dark cave with no other spider species around.”

After returning to the lab and inspecting the spider under a microscope, Milne initially misidentified the species. However, when he re-examined it months later, he realized that the species was indeed new to science.

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Original source:

Milne MA, Wells E (2018) A new species of spider (Araneae, Linyphiidae, Islandiana) from a southern Indiana cave. Subterranean Biology 26: 19-26. https://doi.org/10.3897/subtbiol.26.25605

Six new species of goblin spiders named after famous goblins and brownies

Fictional characters originally ‘described’ by famous English children’s writer Enid Blyton have given their names to six new species of minute goblin spiders discovered in the diminishing forests of Sri Lanka.

The goblins Bom, Snooky and Tumpy and the brownies Chippy, Snippy and Tiggy made their way from the pages of: “The Goblins Looking-Glass” (1947), “Billy’s Little Boats” (1971) and “The Firework Goblins” (1971) to the scientific literature in a quest to shed light on the remarkable biodiversity of the island country of Sri Lanka, Indian Ocean.

As a result of their own adventure, which included sifting through the leaf litter of the local forests, scientists Prof. Suresh P. Benjamin and Ms. Sasanka Ranasinghe of the National Institute of Fundamental Studies, Sri Lanka, described a total of nine goblin spider species in six genera as new to science. Two of these genera are reported for the very first time from outside Australia.

Their paper is published in the open access journal Evolutionary Systematics.

With a total of 45 species in 13 genera, the goblin spider fauna in Sri Lanka – a country taking up merely 65,610 km2 – is already remarkably abundant. Moreover, apart from their diversity, these spiders amaze with their extreme endemism. While some of the six-eyed goblins can only be found at a few sites, other species can be seen nowhere outside a single forest patch.

“Being short-range endemics with very restricted distributions, these species may prove to be very important when it comes to monitoring the effects of climate change and other threats for the forest habitats in Sri Lanka,” explain the researchers.

In European folklore, goblins and brownies are known as closely related small and often mischievous fairy-like creatures, which live in human homes and even do chores while the family is asleep, since they avoid being seen. In exchange, they expect from their ‘hosts’ to leave food for them.

Similarly, at size of a few millimetres, goblin spiders are extremely tough to notice on the forest floors they call home. Further, taking into consideration the anthropogenic factors affecting their habitat, the arachnids also turn out to be heavily dependent on humans.

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Original source:

Ranasinghe UGSL, Benjamin SP (2018) Taxonomic descriptions of nine new species of the goblin spider genera Cavisternum, Grymeus, Ischnothyreus, Opopaea, Pelicinus and Silhouettella (Araneae, Oonopidae) from Sri Lanka. Evolutionary Systematics 2: 65-80. https://doi.org/10.3897/evolsyst.2.25200

Dispatch from the field II: Students describe an elusive spider while stationed in Borneo

A mystery has long shrouded the orb-weaving spider genus Opadometa, where males and females belonging to one and the same species look nothing alike. Furthermore, the males appear to be so elusive that scientists still doubt whether both sexes are correctly linked to each other even in the best-known species.

Such is the case for Opadometa sarawakensis – a species known only from female specimens. While remarkable with their striking red and blue colors and large size, the females could not give the slightest hint about the likely appearance of the male Opadometa sarawakensis.

The red and blue female Opadometa sarawakensis — The red and blue female *Opadometa sarawakensis*

Nevertheless, students taking part in a recent two-week tropical ecology field course organized by the Naturalis Biodiversity Center and Leiden University, and hosted by the Danau Girang Field Centre (DGFC) on the island of Borneo, Malaysia, found a mature male spider hanging on the web of a red and blue female, later identified as Opadometa sarawakensis. Still quite striking, the male was colored in a blend of orange, gray, black, and silver.

At the brink of a long-awaited discovery and eager to describe the male, the students along with their lecturers and the field station scientific staff encountered a peril – with problematic species like the studied orb weaver they were in need for strong evidence to prove that it matched the female from the web. Furthermore, molecular DNA-based analysis was not an option at the time, since the necessary equipment was not available at DGFC.

On the other hand, being at the center of the action turned out to have advantages no less persuasive than DNA evidence. Having conducted thorough field surveys in the area, the team has concluded that the male’s observation on that particular female’s web in addition to the fact that no other Opadometa species were found in the area, was enough to prove they were indeed representatives of the same spider.

Adapting to the quite basic conditions at the DGFC laboratory, the students and their mentors put in use various items they had on hand, including smartphones paired up with headlights mounted on gooseneck clips in place of sophisticated cameras.

In the end, they gathered all the necessary data to prepare the formal description of the newly identified male.

Once they had the observations and the data, there was only one question left to answer. How could they proceed with the submission of a manuscript to a scholarly journal, so that their finding is formally announced and recognised?

Thanks to the elaborated and highly automated workflow available at the peer-reviewed open access Biodiversity Data Journal and its underlying ARPHA Writing Tool, the researchers managed to successfully compile their manuscript, including all underlying data, such as geolocations, and submit it from the field station. All in all, the authoring, peer review and publication – each step taking place within the ARPHA Platform‘s singular environment – took less than a month to complete. In fact, the paper was published within few days after being submitted.

This is the second publication in the series “Dispatch from the field”, resulting from an initiative led by spider taxonomist Dr Jeremy Miller. In 2014, another team of students and their mentors described a new species of curious one-millimetre-long spider from the Danau Girang Field Center. Both papers serve to showcase the feasibility of publication and sharing of easy to find, access and re-use biodiversity data.

“This has been a unique educational experience for the students,” says Jeremy. “They got to experience how tropical field biologists work, which is often from remote locations and without sophisticated equipment. This means that creativity and persistence are necessary to solve problems and complete a research objective. The fact that the students got to participate in advancing knowledge about this remarkable spider species by contributing to a manuscript was really exciting.”

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Original source:

Miller J, Freund C, Rambonnet L, Koets L, Barth N, van der Linden C, Geml J, Schilthuizen M, Burger R, Goossens B (2018) Dispatch from the field II: the mystery of the red and blue Opadometa male (Araneae, Tetragnathidae, Opadometa sarawakensis). Biodiversity Data Journal6: e24777. https://doi.org/10.3897/BDJ.6.e24777

Spider eat spider: Scientists discover 18 new spider-hunting pelican spiders in Madagascar

In 1854, a curious-looking spider was found preserved in 50 million-year-old amber. With an elongated neck-like structure and long mouthparts that protruded from the “head” like an angled beak, the arachnid bore a striking resemblance to a tiny pelican. A few decades later when living pelican spiders were discovered in Madagascar, arachnologists learned that their behavior is as unusual as their appearance, but because these spiders live in remote parts of the world they remained largely unstudied–until recently.

At the Smithsonian’s National Museum of Natural History, curator of arachnids and myriapods Hannah Wood has examined and analyzed hundreds of pelican spiders both in the field in Madagascar and through study of pelican spiders preserved in museum collections. Her analysis, focused on spiders of the Eriauchenius and Madagascarchaea genera, sorted the spiders she studied into 26 different species–18 of which have never before been described. Wood and colleague Nikolaj Scharff of the University of Copenhagen describe all 26 pelican spider species in the Jan. 11 issue of the journal Zookeys.

Wood says pelican spiders are well known among arachnologists not only for their unusual appearance, but also for the way they use their long “necks” and jaw-like mouthparts to prey on other spiders. “These spiders attest to the unique biology that diversified in Madagascar,” she said.

Pelican spiders are active hunters, prowling the forest at night and following long silk draglines that lead them to their spider prey. When a pelican spider finds a victim, it swiftly reaches out and impales it on its long, fang-tipped “jaws,” or chelicerae. Then it holds the capture away from its body, keeping itself safe from potential counterattacks, until the victim dies.

Today’s pelican spiders are “living fossils,” Wood says–remarkably similar to species found preserved in the fossil record from as long as 165 million years ago. Because the living spiders were found after their ancestors had been uncovered in the fossil record and presumed extinct, they can be considered a “Lazarus” taxon. In addition to Madagascar, modern-day pelican spiders have been found in South Africa and Australia–a distribution pattern that suggests their ancestors were dispersed to these landmasses when the Earth’s supercontinent Pangaea began to break up around 175 million years ago.

Madagascar is home to vast numbers of plant and animal species that exist only on the island, but until recently, only a few species of pelican spiders had been documented there. In 2000, the California Academy of Sciences launched a massive arthropod inventory in Madagascar, collecting spiders, insects and other invertebrates from all over the island.

Wood used those collections, along with specimens from other museums and spiders that she collected during her own field work in Madagascar, to conduct her study. Her detailed observations and measurements of hundreds of specimens led to the identification of 18 new species–but Wood says there are almost certainly more to be discovered. As field workers continue to collect specimens across Madagascar, “I think there’s going to be a lot more species that haven’t yet been described or documented,” she said.

The spiders Wood personally collected, including holotypes (the exemplar specimens) for several of the new species, will join the U.S. National Entomological Collection at the Smithsonian, the second-largest insect collection in the world, where they will be preserved and accessible for further research by scientists across the globe.

All of the pelican spiders that Wood described live only in Madagascar, an island whose tremendous biodiversity is currently threatened by widespread deforestation. The new species add to scientists’ understanding of that biodiversity, and will help Wood investigate how pelican spiders’ unusual traits have evolved and diversified over time. They also highlight the case for conserving what remains of Madagascar’s forests and the biodiversity they contain, she says.

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Funding for this study was provided by the Danish National Research Foundation and the National Science Foundation.

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Original source:

Wood HM, Scharff N (2018) A review of the Madagascan pelican spiders of the genera Eriauchenius O. Pickard-Cambridge, 1881 and Madagascarchaea gen. n. (Araneae, Archaeidae). ZooKeys 727: 1-96. https://doi.org/10.3897/zookeys.727.20222