Lepidoptera

Mysterious new moth species discovered in Europe

The moth, named Mirlatia arcuata, by a research team from Germany, Austria, and the United Kingdom, is one of the most remarkable discoveries in Lepidoptera of recent decades.

European Lepidoptera (butterflies and moths), with a currently known inventory of approximately 11, 000 species, are generally considered well-researched. However, a new genus and species from the Geometrid moth family described in the scientific journal ZooKeys tell a different story. The moth, named Mirlatia arcuata by a research team from Germany, Austria, and the United Kingdom, is one of the most remarkable discoveries in Lepidoptera of recent decades.

Decades-old UFO

In the early 1980s, Austrian amateur entomologist Robert Hentscholek collected three specimens of a moth species in southern Dalmatia, Croatia, which were integrated into his collection or given to colleagues without being identified. Decades later, the collection was sold to Toni Mayr, another hobbyist researcher from Austria, who immediately noticed the unusual insect that stood out from all known European species and couldn’t even be assigned to a known genus.

The collector was contacted to provide more information, and it turned out that a male and a female specimen of the same species had been given to another collector who had since passed away. The female specimen was rediscovered in 2015 in the collection of the Natural History Museum in Vienna, while the whereabouts of the other specimen remained unknown. The unique male was finally presented to the Tyrolean Federal State Museums by Toni Mayr.

Light traps are set in Podgora, Croatia, in 2022. Photo by Stanislav Gomboc

In 2022, a research team was formed to identify this enigmatic moth, and it was finally described as a new genus and species in early November 2023. It was given the name Mirlatia arcuata, where Mirlatia is an aggregate of the stems of two Latin words that translate loosely as “bringing a surprise,” a reference to the surprising discovery of this curious new moth.

Cold-adapted or introduced?

Wing venation of a male *Mirlatia arcuata*.

The discovery of such a large and distinctive moth species in a well-explored region like southern Croatia might seem unlikely. However, according to researcher Peter Huemer of the Tyrolean State Museums (Ferdinandeum), who took part in the study, there was surprisingly little research conducted in that area during the moth’s flight season in March. “It’s possible that Mirlatia arcuata is a cold-adapted, winter-active species that would need to be sought in the middle of winter,” he says.

The hypothesis of introduction from other continents was discarded by the study authors for several reasons. Axel Hausmann from the Zoological State Collection in Munich examined all known moths from cold regions in the northern and southern hemisphere and could not identify a similar species from these regions. Furthermore, the collecting location in Podgora is not in close proximity to a port, and during the Yugoslavian era, the traffic in Dalmatian ports was rather limited. Also, Split and other Croatian ports were rarely visited by ships from other continents during the communist period. Additionally, Robert Hentscholek had never collected in the tropics, ruling out the possibility of a labeling error.

Many questions, few answers

Despite all efforts, the relationships of the new genus and species have not been definitively clarified. Even the assignment to the subfamily Larentiinae is not entirely secure and is based on a few features like wing venation. Initial genetic data from the mitochondrial COI barcode, as well as characteristics of the tympanal organ (auditory organ), point to a largely independent systematic position of the species. Further investigations of the entire genome could provide more clarity.

Habitat of *Mirlatia arcuata* in Podgora, Croatia. Photo by Stanislav Gomboc

Even less is known about the biology of the new species, apart from the fact that its known habitat consists of coastal rock biotopes with Mediterranean vegetation. In March 2022, Slovenian lepidopterologist Stane Gomboc initiated a comprehensive search, but it turned out to be unsuccessful. It’s possible that the moth’s flight season has already ended due to climate warming.

The study authors hope they will soon rediscover Mirlatia arcuata and know more about its habitat requirements and biology.

Research Article:

Hausmann A, László GM, Mayr T, Huemer P (2023) Surprising discovery of an enigmatic geometrid in Croatia: Mirlatia arcuata, gen. nov., sp. nov. (Lepidoptera, Geometridae). ZooKeys 1183: 99-110. https://doi.org/10.3897/zookeys.1183.110163

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New butterfly species named after Smithsonian’s retired museum specialist

“Brian has provided critical support to visiting researchers for many years,” writes the team of researchers in their new study in the journal ZooKeys.

When introducing a new species to science, taxonomists always get to choose its scientific name. And while there are some general rules to naming, there’s also relative freedom. Often, new species are named after the area where they were found, or their key diagnostic features, but researchers may also choose names that recognize those who helped or inspired them in their career: prominent scientists, celebrities, and, sometimes, their grandma, or their dog. In Amazonia, a new species of butterfly was discovered whose name honors the decades-long work of someone who has worked patiently behind the scenes in museum collections to provide invaluable support to researchers.

Caeruleuptychia harrisi was named in recognition of Brian P. Harris, museum specialist at the Smithsonian National Museum of Natural History, “for his tireless effort in facilitating butterfly research at USNM by going above and beyond to support visiting researchers,” according to a study which was just published in the journal ZooKeys. “Brian has provided critical support to visiting researchers for many years, including several co-authors on the paper,” writes the team of researchers, led by Harvard University’s Shinichi Nakahara.

In fact, Harris personally collected the type specimen that later facilitated the scientific description of the new species. After collecting it in Brazil, he deposited it at USNM, where it could be studied as a reference for this species.

Brian P. Harris at the Smithsonian Institution holding Morpho hecuba. Photo by Lynn Cooper

“I think it is really important to recognize someone who has dedicated а good amount of his lifetime providing technical help to support research,” says Shinichi Nakahara.

Brian Harris started working at the Smithsonian Institution in July 2005. There, he served as a museum specialist for Lepidoptera (moths and butterflies) and Hymenoptera (ants, bees, and wasps) until he retired in July 2019.

“Brian’s job curating Lepidoptera and Hymenoptera collections is critical for us visiting researchers to conduct research based on these specimens, but sadly this kind of technical support is often not well recognized well in the current scientific community,” says Shinichi Nakahara. “I visited the Smithsonian’s Lepidoptera collection three times, in 2015, 2018, and 2023 (after his retirement!), and Brian provided me with the best support I could ever receive in all of these three visits. It was evident to me that he wanted us visitors to make the most out of the collections and he went out of his way to support my short visits to the collection.”

“He always communicated with me in advance about which butterfly group I wanted to examine, would set up an imaging system in advance, and even tried to help me find field notes left by a deceased collector by taking me to the stock room and spending time exploring the museum with me!,“ he adds.

Before working at the Smithsonian Institution, Brian Harris spent 18 years at the Natural History Museum of Los Angeles County (LACM). In the mid-1970s and early 1980s, he played drums for a band before starting at LACM.

Research article:

Nakahara S, Kleckner K, Barbosa EP, Lourenço GM, Casagrande MM, Willmott KR, Freitas AVL (2023) Reassessment of the type locality of Euptychia stigmatica Godman, 1905, with the description of two new sibling species from Amazonia (Lepidoptera, Nymphalidae, Satyrinae, Satyrini). ZooKeys 1167: 57-88. https://doi.org/10.3897/zookeys.1167.102979

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Experts in insect taxonomy “threatened by extinction” reveals the first European Red List of Taxonomists

While insect populations continue to decline, taxonomic expertise in Europe is at serious risk, confirms data obtained within the European Red List of Insect Taxonomists, a recent study commissioned by the European Union.

Expertise tends to be particularly poor in the countries with the richest biodiversity, while taxonomists are predominantly male and ageing

While insect populations continue to decline, taxonomic expertise in Europe is at serious risk, confirms data obtained within the European Red List of Insect Taxonomists, a recent study commissioned by the European Union.

Scientists who specialise in the identification and discovery of insect species – also known as insect taxonomists – are declining across Europe, highlights the newly released report by CETAF, International Union for Conservation of Nature (IUCN) and Pensoft. The authors of this report represent different perspectives within biodiversity science, including natural history and research institutions, nature conservation, academia and scientific publishing.

Despite the global significance of its taxonomic collections, Europe has been losing taxonomic expertise at such a rate that, at the moment nearly half (41.4%) of the insect orders are not covered by a sufficient number of scientists. If only EU countries are counted, the number looks only slightly more positive (34.5%). Even the four largest insect orders: beetles (Coleoptera), moths and butterflies (Lepidoptera), flies (Diptera) and wasps, bees, ants and sawflies (Hymenoptera) are only adequately ‘covered’ in a fraction of the countries.

To obtain details about the number, location and productivity of insect taxonomists, the team extracted information from thousands of peer-reviewed research articles published in the last decade, queried the most important scientific databases and reached out to over fifty natural science institutions and their networks. Furthermore, a dedicated campaign reached out to individual researchers through multiple communication channels. As a result, more than 1,500 taxonomists responded by filling in a self-declaration survey to provide information about their personal and academic profile, qualification and activities.

Then, the collected information was assessed against numerical criteria to classify the scientists into categories similar to those used by the IUCN Red List of Threatened Species^TM. In the European List of Insect Taxonomists, these range from Eroded Capacity (equivalent to Extinct) to Adequate Capacity (equivalent to Least Concern). The assessment was applied to the 29 insect orders (i.e. beetles, moths and butterflies etc.) to figure out which insect groups the society, conservation practitioners and decision-makers need not be concerned at this point.

Overview of the taxonomic capacity in European countries based upon the Red List Index (colour gradient goes from red (Eroded Capacity) to green (Adequate Capacity).
Image by the European Red List of Taxonomists consortium.

On a country level, the results showed that Czechia, Germany and Russia demonstrate the most adequate coverage of insect groups. Meanwhile, Albania, Azerbaijan, Belarus, Luxembourg, Latvia, Ireland and Malta turned out to be the ones with insufficient number of taxonomists.

In most cases, the availability of experts seems to correlate to GDP, as wealthiest countries tend to invest more in their scientific institutions.

What is particularly worrying is that the lack of taxonomic expertise is more evident in the countries with the greatest species diversity. This trend may cause even more significant problems in the knowledge and conservation of these species, further aggravating the situation. Thus, the report provides further evidence about a global pattern where the countries richest in biodiversity are also the ones poorest in financial and human resources.

The research team also reminds that it is European natural history museums that host the largest scientific collections – including insects – brought from all over the globe. As such, Europe is responsible to the world for maintaining taxonomic knowledge and building adequate expert capacity.

Other concerning trends revealed in the new report are that the community of taxonomists is also ageing and – especially in the older groups – male-dominated (82%).

“One reason to have fewer young taxonomists could be due to limited opportunities for professional training (…), and the fact that not all professional taxonomists provide it, as a significant number of taxonomists are employed by museums and their opportunities for interaction with university students is probably not optimal. Gender bias is very likely caused by multiple factors, including fewer opportunities for women to be exposed to taxonomic research and gain an interest, unequal offer of career opportunities and hiring decisions. A fair-playing field for all genders will be crucial to address these shortcomings and close the gap.”
comments Ana Casino, CETAF’s Executive Director.

***

Entomologist examining a small insect under a microscope.
Photo by anton_shoshin/stockadobe.com.

The European Red List of Taxonomists concludes with practical recommendations concerning strategic, science and societal priorities, addressed to specific decision-makers.

The authors give practical examples and potential solutions in support of their call to action.

For instance, in order to develop targeted and sustainable funding mechanisms to support taxonomy, they propose the launch of regular targeted Horizon Europe calls to study important insect groups for which taxonomic capacity has been identified to be at a particularly high risk of erosion.

To address specific gaps in expertise – such as the ones reported in the publication from Romania – a country known for its rich insect diversity, yet poor in taxonomic expertise – the consortium proposes the establishment of a natural history museum or entomological research institute that is well-fitted to serve as a taxonomic facility.

Amongst the scientific recommendations, the authors propose measures to ensure better recognition of taxonomic work at a multidisciplinary level. The scientific community, including disciplines that use taxonomic research, such as molecular biology, medicine and agriculture – need to embrace universal standards and rigorous conduct for the correct citation of scientific publications by insect taxonomists.

Societal engagement is another important call. “It is pivotal to widely raise awareness of the value and impact of taxonomy and the work of taxonomists. We must motivate young generations to join the scientific community” points Prof. Lyubomir Penev, Managing Director of Pensoft.

***

“Understanding taxonomy is a key to understanding the extinction risk of species. If we strategically target the gaps in expert capacity that this European Red List identifies, we can better protect biodiversity and support the well-being and livelihoods of our societies. With the climate crisis at hand, there is no time left to waste,”
added David Allen from the IUCN Red List team.

“As a dedicated supporter of the IUCN Red List, I am inspired by this call to strengthen the capacity, guided by evidence and proven scientific methods. However, Europe has much more scientific capacity than most biodiversity-rich regions of the world. So, what this report particularly highlights is the need for massively increasing investment in scientific discovery, and building taxonomic expertise, around the world,”
said Jon Paul Rodríguez, Chair of the IUCN Species Survival Commission.

***

Follow and join the conversation on Twitter using the #RedListTaxonomists hashtag.

A provisional checklist of European butterfly larval foodplants

For the first time, a list of the currently accepted plant names utilised by 471 European butterfly larvae is presented, with references.

Guest blog post by Harry E. Clarke, Independent Researcher

5th instar Swallowtail larvae feeding on Milk-parsley.

Many books on butterflies publish lists of their larval foodplants. However, many of these lists of larval foodplants have been copied from previous lists, which in turn have been copied from previous lists. Consequently, errors have crept in, and many plant names have long been superseded. This can result in duplicates in the list, with the same plant being given two different names. Most plant lists do not include the authority, which can make it difficult or impossible to identify which plant is being referred to. Some of these plants may not be used by butterflies in Europe, but elsewhere in their range. Or the plants may have been used in breeding experiments, but not used by the butterflies in the wild.

Many of these publications providing the larval foodplants of butterflies only provide the binomial name, without specifying the author. This can create problems in knowing which species of plant is being used, as the same plant name has been used in the past by different authors to describe different species. In some cases, distribution can be used to determine the correct species, but plants can often have similar distributions. For example, in the World Checklist of Vascular Plants, there are 40 entries for the plant with the scientific name Centaurea paniculata, which refer to thirteen different accepted species, depending on authors, subspecies, and variety or form.

Not quite so simple: updating the current lists of larval foodplants

With climate change and habitat loss threatening numerous species, the conservation of butterflies (and other animals) is becoming more important. Whilst many factors determine the distribution of butterflies, such as temperature and rainfall, their survival depends solely on the kinds of plants their larvae eat. Accurate lists of larval foodplants are therefore important to find out where to direct limited conservation resources for the best result.

What started out as a straightforward job of updating the existing lists of larval foodplants with currently accepted names turned out to be a far bigger job. Many of the lists are incomplete, and may vary throughout the range of the butterfly. Here, errors have crept in too. Many references provide incomplete, unverifiable information. Many species of butterfly lay their eggs off-host, rather than on the host plant. For example, the Silver-washed Fritillary (Argynnis paphia)oviposits on tree trunks above where Viola species are growing. Consequently, oviposition records need to be treated with caution, depending on the species.

What do butterfly larvae eat, and why does it matter?

Butterfly larvae can be very fussy about which plants they can use. 20% of European butterfly larvae are monophagous, feeding on just one species of plant. 50% are oligophagous, feeding on a few different closely related plants, whilst 30% are polyphagous feeding on plants in many different families. The Holy Blue (Celastrina argiolus) can utilise plants in an astonishing 19 different families.

The oligophagous butterflies can be divided into two groups:

Oligophagous-monophagous (OM) – feeding on one plant species in one region, and another species in another region.
Oligophagous-polyphagous (OP) – feeding on several closely related species of plants throughout their range, usually in the same genus, or a closely related genus.

4th instar Small Tortoiseshell feeding on Common Nettle.

Plant preferences are only known for a few species of butterflies. For example, the English race of the Swallowtail (Papilio machaon) feeds on Milk-parsley (Peucedanum palustre), whereas in the rest of Europe it has been recorded on 62 other plants. The main larval foodplant of the Small Tortoiseshell (Aglais urticae) is Common Nettle(Urtica dioica), although it will occasionally use other plants.

The survivability of larvae on different plants is largely unknown, except in a few cases where the butterfly species has been studied in detail. There are plants that larvae may be able to eat, but that would likely not help them survive to pupation.

Two species are known to switch their larval foodplant during their second year of development. The Scarce Fritillary (Euphydryas maturna),for example, switches from Ash (Fraxinus excelsior) to Guelder-rose (Viburnum opulus). The Northern Grizzled Skipper (Pyrgus centaureae) switches from Dwarf birch (Betula nana) to Cloudberry (Rubus chamaemorus).

The most delicious plants

For the first time, a list of the current accepted plant names utilised by 471 European butterfly larvae is presented, with references. Where possible, errors in previous lists have been removed. The list of larval foodplants doubled compared to previous published lists. This has resulted in a list of 1506 different plant species in 72 different families. 86 plant records are only known at the generic level. Larval foodplants of 25 butterfly species are currently unknown, which are mostly the “Browns” (Satyrinae), which probably feed on grasses (Poaceae), or possibly sedges (Cyperaceae).

Whilst most plant families are utilised by less than six butterfly species, a few plant families are particularly favoured, with grasses (Poaceae) and legumes (Fabaceae) being the most popular. Similarly, most plant species are only utilised by a few butterfly species, but the fine grasses Sheep’s Fescue (Festuca ovina) and Red Fescue (Festuca rubra) are favoured by a large number of butterfly species.

Taxonomic splits create problems. Where cryptic species are allopatric, records can be allocated on the basis of their distribution. But where cryptic species are sympatric, this will require a resurvey to determine the larval foodplants. It cannot be assumed that two cryptic butterfly species use the same plants, as something has to become different for them to evolve into separate species.

Looking forward

Future publications should ensure that old and ambiguous plant names are not used. Plant names should be specified with their full scientific name, as specified by the International Code of Nomenclature for algae, fungi, and plants. The World Checklist of Vascular Plants should be checked to ensure the currently accepted plant name is being used.

Fully documented records are needed of what larval foodplants butterfly larvae are utilising in the wild. To get a better understanding of usage, full details need to be recorded, including date, location, altitude, abundance, and larval stage. Abundance will help in the understanding of preferences. To allow records to be properly verified, evidence should be provided on how the larvae and plants were identified. Regional lists are also important – to help direct conservation efforts to the plants being used locally, rather than elsewhere. This list of larval foodplants is provided as a step towards a fully justified database, which will be updated as and when corrections are found. It highlights those 25 butterfly species whose larval foodplants are currently unknown.

4th instar Chequered Skipper (Carterocephalus palaemon) larvae feeding on Purple Moor-grass (Molinia caerulea).

Research article:

Clarke HE (2022) A provisional checklist of European butterfly larval foodplants. Nota Lepidopterologica 45: 139-167. https://doi.org/10.3897/nl.45.72017

First moth species on Alpenrose discovered

Discovery of the first moth species to mine the leaves of the highly poisonous Alpine rose

Rust-red alpine rose, one of the most popular alpine plants. Photo by Ingrid Huemer

An Austrian-Swiss research team was able to find a previously unknown glacial relic in the Alps, the Alpine rose leaf-miner moth. It is the first known species to have its caterpillars specializing on the rust-red alpine rose, a very poisonous, widely distributed plant that most animals, including moths and butterflies, strictly avoid. The extraordinary record was just published in the peer-reviewed scientific journal Alpine Entomology.

Poisonous host plant

The rust-red alpine rose (Rhododendron ferrugineum) is among the best-known and most attractive plants due to its flowering splendor – at least for humans. It is, in fact, a highly poisonous plant, strictly avoided by grazing animals. For insects, the alpine rose is attractive at most as a nectar plant; insect larvae, on the other hand, develop on it only in exceptional cases. This also applies to Alpine butterflies and moths, which leave Alpine roses largely untouched despite their wide distribution. Therefore, the discovery of a highly specialized species in the Alps came as a complete surprise.

Chance find

Alpine rose leaf-miner moth adults resting on leaves of the host-plant in Ardez, Graubünden, Switzerland. Photos by Jürg Schmid

Since alpine roses are unattractive to caterpillars and no insect the entire Alpine region was previously known to specialize on them, butterfly and moth experts had considered them rather uninteresting and ignored them in their research. The discovery of the alpine rose leaf-miner wasn’t the result of a targeted search: it was a pure stroke of luck.

During a cloudy spell in July this year, researchers surveying the butterflies in Ardez in the Engadine valley, Switzerland, happened to take a break exactly at an infested alpine rose bush.

“The accidental sighting of the first caterpillar in an alpine rose leaf was an absolute adrenaline rush, it was immediately clear that this must be an extraordinary species,”
Peter Huemer, researcher and head of the natural sciences department of the Tyrolean State Museums

Peter Huemer, researcher and head of the natural sciences department of the Tyrolean State Museums, and Swiss butterfly and moth expert Jürg Schmid came back in late July and early August to look for caterpillars and pupae and find out more about this curious insect. The extended search yielded evidence of a stable population of a species that was initially a complete enigma.

Life in the leaf

Leaf-mines of the alpine rose leaf-miner moth on *Rhododendron ferrugineum* in Ardez, Graubünden, Switzerland. Photos by Peter Huemer

The alpine rose leaf-miner moth drills through the upper leaf skin and into the leaf interior immediately after the caterpillar hatches. The caterpillar then spends its entire life until pupation between the intact leaf skins, eating the leaf from the inside. Thanks to this behavior, the caterpillar is just as well protected from bad weather as from many predators such as birds, spiders, or some carnivore insects. The feeding trail, called a leaf mine, begins with a long corridor and ends in a large square-like mine section. The feces are deposited inside this mine. When the time comes for pupation, the caterpillar leaves the infested leaf and makes a typical web on the underside or a nearby leaf. With the help of several fine silk threads, it produces an elaborate “hammock”, in which the pupation finally takes place. In the laboratory, after about 10 days, the successful breeding to a moth succeeded, with a striking result.

Enigmatic glacial relic

Final instar larva of the alpine rose leaf-miner moth on *Rhododendron ferrugineum* in Ardez, Graubünden, Switzerland. Photo by Jürg Schmid

Huemer and Schmid were surprised to find out that the moths belonged to a species that was widespread in northern Europe, northern Asia and North America – the swamp porst leaf-miner butterfly Lyonetia ledi. By looking at its morphological features, such as wing color and pattern, and comparing its DNA barcodes to those of northern European specimens, they were able to confirm its identity.

Habitat of the alpine rose leaf-miner moth in Engadine/Switzerland with *Rhododendron ferrugineum*. Photo by Jürg Schmid

The Engadine population, however, is located more than 400 km away from the nearest other known populations, which are on the border of Austria and the Czech Republic. Furthermore, the species lives in northern Europe exclusively on swamp porst and Gagel bush – two shrubs that are typical for raised bogs and absent from the Alps. However, the researchers suggest that in earlier cold phases – some 22,000 years ago – the swamp porst and the alpine rose did share a habitat in perialpine lowland habitats north of the Alps. It is very likely that after the last cold period and the melting of the glaciers, some populations of the species shifted their host preference from the swamp porst to the alpine rose. The separation of the distribution areas of the two plants caused by subsequent warm phases inevitably led to the separation of the moth populations.

Extinction risk

Characteristic cocoon with final instar larva and pupa of the alpine rose leaf-miner moth on *Rhododendron ferrugineum* in Ardez, Graubünden, Switzerland. Photos by Jürg Schmid

The Alpine Rose Leaf-miner Moth is so far only known from the Lower Engadine. It lives in a steep, north-exposed, spruce-larch-pine forest at about 1,800 m above sea level. The high snow coverage in winter and the largely shady conditions in summer mean that alpine roses don’t get to bloom there. The scientists suspect that the moth species can still be discovered in places with similar conditions in the northern Alps, such as in neighboring Tyrol and Vorarlberg. Since the moth is likely nocturnal and flies late in the year, probably hibernating in the adult stage, the search for the caterpillars and pupae is more promising. However, the special microclimate of the Swiss location does not suggest that this species, which has so far been overlooked despite 250 years of research, is widespread. On the contrary, there are legitimate concerns that it could be one of the first victims of climate change.

Research article:

Huemer P, Schmid J (2021) Relict populations of Lyonetia ledi Wocke, 1859 (Lepidoptera, Lyonetiidae) from the Alps indicate postglacial host-plant shift to the famous Alpenrose (Rhododendron ferrugineum L.). Alpine Entomology 5: 101-106. https://doi.org/10.3897/alpento.5.76930

New alpine moth solves a 180-year-old mystery

Butterflies and moths (order Lepidoptera) are one of the most diverse animal groups. To date, scientists have found as many as 5,000 species from the Alps alone. Having been a place of intensive research interest for 250 years, it is considered quite a sensation if a previously unknown species is discovered from the mountain range these days. This was the case when a Swiss-Austrian team of researchers described a new species of alpine moth in the open-access, peer-reviewed journal Alpine Entomology, solving a 180-year-old mystery.

Decades of research work

Initially, the team – Jürg Schmid, a full-time dentist, author and passionate butterfly and moth researcher from Switzerland, and Peter Huemer, head of the natural science collections of the Tyrolean State Museums in Innsbruck and author of more than 400 publications, needed a lot of patience.

Habitat of *Dichrorampha velata*. Photo by Jürg Schmid

Almost thirty years ago, in the 1990s, the two researchers independently discovered the same moth species. While they found it was similar to a moth of the leaf-roller family Tortricidae and commonly named as Dichrorampha montanana which had been known to science since 1843, it was also clearly different. Wing pattern and internal morphology of genitalia structures supported a two-species hypothesis. Moreover, the two were found at the same time in the same places – a further indication that they belong to separate species. Extensive genetic investigations later confirmed this hypothesis, but the journey of presenting a new species to science was far from over.

The Hidden Alpine Moth

To “baptise” a new species and give it its own name, scientists first have to check that it hasn’t already been named. This prevents the same species from having two different names, and essentially means looking at descriptions of similar species and comparing the new one against them to prove it is indeed unknown to science. In the case of this new moth, there were six potentially applicable older names that had to be ruled out before it could be named as new.

*Dichrorampha velata*. Photo by Jürg Schmid

Intensive and time-consuming research of original specimens in the nature museums of Paris, Berlin, Frankfurt and London eventually led to the finding that all six ancient names actually referred to one and the same species – Dichrorampha alpestrana, which has been known since 1843 and had to be adopted as the valid older name for Dichrorampha montanana as having been described a couple of months earlier. Similarly, all other available names proved to belong to Dichrorampha alpestrana. The species discovered by Schmid and Huemer, however, was different, not yet named, and could finally be described as new to science. The authors chose to name it Dichrorampha velata – the Latin species name means “veiled” or “hidden,” pointing to the complicated story behind its discovery.

Lots of unanswered questions

The Hidden Alpine Moth is a striking species with a wingspan of up to 16 mm and a characteristic olive-brown color of the forewings with silvery lines. It belongs to a group of mainly diurnal moths and is particularly common locally in colorful mountain flower meadows. For now, we know that its distribution extends at least from Salzburg and Tyrol through southern Switzerland and the Jura to the French and Italian Alps, with isolated finds known from the Black Forest in Germany, but the researchers believe it might have a wider range in Central Europe.

The biology of the new species is completely unknown, but Huemer and Schmid speculate that its caterpillars may live in the rhizome of yarrow or chrysanthemums like other species of the same genus. As with many other alpine moths, there is a strong need for further research, so we can get a better understanding of this fascinating insect.

Original source:

Schmid J, Huemer P (2021) Unraveling a complex problem: Dichrorampha velata sp. nov., a new species from the Alps hitherto confounded with D. alpestrana ([Zeller], 1843) sp. rev. = D. montanana (Duponchel, 1843) syn. nov. (Lepidoptera, Tortricidae). Alpine Entomology 5: 37-54. https://doi.org/10.3897/alpento.5.67498

Development anomalies recorded for the first time in a rare tiger moth

The Menetries’ tiger moth (Arctia menetriesii) is one of the rarest and most poorly studied Palaearctic moth species. Even though its adult individuals are large and brightly coloured, they are difficult to spot, because they aren’t attracted to light, they’re not active at night, and they fly reluctantly. Currently, the species only inhabits two countries – Finland and the Russian Federation, and is included in the Red Lists of both, as Data Deficient in the former and Vulnerable in the latter.

Live male adult of *Arctia menetriesii*. Photo by Evgeny Koshkin

For 13 years, researcher Evgeny Koshkin of the Institute of Water and Ecology Problems of the Far Eastern branch of the Russian Academy of Sciences kept searching for the elusive Menetries’ tiger moth in its habitat in the Bureinsky Nature Reserve, 400 km north of Khabarovsk, Russia, but he only ever found it in 2018, in what was the first record of this species in 34 years in this region. That’s how rare it is.

Eggs of Arctia Menetrisii. Photo by Evgeny Koshkin

After collecting eggs from a female moth, Koshkin documented the species’ biology under laboratory conditions and described its immature stages in the open-access, peer-reviewed scientific journal Nota Lepidopterologica. For the first time, detailed photographs of all developmental stages of this species have been published.

In laboratory conditions, the development cycle of the Menetries’ tiger moth from egg laying to an adult individual lasts between 72 and 83 days. Out of the 105 eggs that the female moth laid in captivity, however, only 13 transformed into adults, and out of those, only four were able to spread their wings. In the last larval instar, about 75% of the larvae died immediately before pupation, and a number of metamorphosis anomalies were observed in the ones that survived.

Metamorphosis anomalies in *Arctia menetriesii* (L-R): lethal larva-pupa intermediate; female emerged from larva-pupa intermediate – head and thorax left covered with the larval cuticle; female emerged from larva-pupa intermediate – larval cuticle removed; pupa with insignificant anomalies; pupa with severe anomalies. Photos by Evgeny Koshkin

This is the first time that such anomalies and morphological defects of pupae are documented in the Menetries’ tiger moth, and it is possible that they occur in a similar way in nature. Some metamorphosis anomalies manifested as larva-pupa intermediates due to disrupted molting, and pupae with severe anomalies produced adults that were unable to inflate their wings.

Seventh instar larva of *Arctia Menetresii*. Photo by Evgeny Koshkin

It is possible that the diet of the laboratory-reared larvae might have had something to do with the high mortality rate before pupation and the metamorphosis anomalies during it. Some of the larvae were fed on Aconitum leaves and larch needles during certain periods of their lives, and it is possible that toxic compounds found in these plants might have impacted their health and development. More research on larval diet would be needed, however, to confirm or reject this hypothesis.

Original source:

Koshkin ES (2021) Life history of the rare boreal tiger moth Arctia menetriesii (Eversmann, 1846) (Lepidoptera, Erebidae, Arctiinae) in the Russian Far East. Nota Lepidopterologica 44: 141-151. https://doi.org/10.3897/nl.44.62801

Carried with the wind: mass migration of Larch Budmoth to the Russian High Arctic

*Live Larch Budmoth walking on tundra, Vize Island, air temperature +3C, 30.07.2020. Photo by Dr Maria Gavrilo*

Arctic habitats have fascinated biologists for centuries. Their species-poor insect faunas, however, provide little reward for entomologists – scientists who study insects – to justify spending several weeks or even months in the hostile environments of tundra or polar deserts. As a result, data on insects from the High Arctic islands are often based on occasional collecting and remain scarce.

*Vize Island has uniform flatland landscape with lichen-moss vegetation typicalfor High-Arctic islands. Photo by Dr Maria Gavrilo*

Vize Island, located in the northern part of the Kara Sea, is one of the least studied islands of the Russian High Arctic in terms of its biota. Scientists Dr Maria V. Gavrilo of the Arctic and Antarctic Research Institute in Russia and Dr Igor I. Chupin of the Institute of Systematics and Ecology of Animals in Russia visited this ice-free lowland island in the summer of 2020.

“Our expedition studied the ecology of Ivory Gull”, Maria Gavrilo says, “but we also looked for other wildlife.” Because of the lack of data, scientists appreciate any observation on insects they can get from the High Arctic.

On the island, the team found hundreds of small moths. They were identified by Dr Mikhail V. Kozlov of the University of Turku, Finland, as Larch Budmoths – the first and only terrestrial invertebrate to ever be observed and collected on Vize Island. Their observations are published in the open-access, peer-reviewed journal Nota Lepidopterologica.

Live Larch Budmoth walking on tundra, Vize Island, air temperature +3C, 30.07.2020. The scientists believe that this moth arrived on the island two weeks earlier after travelling with the winds some 1200 km across the Arctic ocean. Photo by Dr Maria Gavrilo

The scientists first observed live and freshly dead moths on the sandy banks of a pond near the meteorological station. Then, they saw hundreds of them at the sandy bottom of a river valley with shallow streams. Moths, single or in groups, were mostly found at the water’s edge, along with some fine floating debris. Despite extremely low daily temperatures (+2-5°C), flying moths were also spotted on several occasions.

*On average, four dead moths per 10 square meters were counted along the sandy river bed during a survey on 19.07.2020. Photo by Dr Maria Gavrilo*

The larvae of Larch Budmoth feed on the needles of different coniferous trees. Because Vize Island is located 1000 km north of the tree limit, the scientists can be sure about the migratory origin of the moths observed on Vize Island. They were likely transported there on 12–14 July 2020 by strong winds coming from the continent. The nearest potential source population of Larch Budmoth is located in the northern part of the Krasnoyarsk Region, which means they travelled at least 1200 km.

“The Arctic islands will be colonised by forest insects as soon as changing environmental conditions allow the establishment of local populations.”
Dr Mikhail V. Kozlov, University of Turku

Importantly, some moths remained alive and active for at least 20 days after their arrival, which means that long-distance travel did not critically deplete resources stored in their bodies. The current changes in climate are making it easier for more southerly insects to invade species-poor areas in the High Arctic islands – provided they can reach them and survive there.

“The successful arrival of a large number of live moths from continental Siberian forests to Vize Island has once more demonstrated the absence of insurmountable barriers to initial colonisation of High Arctic islands by forest insects”, concludes Mikhail Kozlov, who has studied Arctic insects for decades. “The Arctic islands will be colonised by forest insects as soon as changing environmental conditions allow the establishment of local populations.”

***

Original source:

Gavrilo MV, Chupin II, Kozlov MV (2021) Carried with the wind: mass occurrence of Zeiraphera griseana (Hübner, 1799) (Lepidoptera, Tortricidae) on Vize Island (Russian High Arctic). Nota Lepidopterologica 44: 91–97. https://doi.org/10.3897/nl.44.63662

Over a century later, the mystery of the Alfred Wallace’s butterfly is solved

An over a century-long mystery has been surrounding the Taiwanese butterfly fauna ever since the “father of zoogeography” Alfred Russel Wallace described a new species of butterfly: Lycaena nisa, whose identity was only re-examined in a recent project looking into the butterflies of Taiwan. Based on the original specimens, in addition to newly collected ones, Dr Yu-Feng Hsu of the National Taiwan Normal University resurrected the species name and added two new synonyms to it.

Described by the “father of zoogeography” and co-author of the theories of evolution and natural selection, the species hasn’t been reexamined since 1866

An over a century-long mystery has been surrounding the Taiwanese butterfly fauna ever since the “father of zoogeography” Alfred Russel Wallace, in collaboration with Frederic Moore, authored a landmark paper in 1866: the first to study the lepidopterans of the island.

Back then, in their study, Moore dealt with the moths portion and Wallace investigated the butterflies. Together, they reported 139 species, comprising 93 nocturnal 46 diurnal species, respectively. Of the latter, five species were described as new to science. Even though the correct placements of four out of those five butterflies in question have been verified a number of times since 1886, one of those butterflies: Lycaena nisa, would never be re-examined until very recently.

In a modern-day research project on Taiwanese butterflies, scientists retrieved the original type specimen from the Wallace collection at The History Museum of London, UK. Having also examined historical specimens housed at the Taiwan Agricultural Research Institute, in addition to newly collected butterflies from Australia and Hong Kong, Dr Yu-Feng Hsu of the National Taiwan Normal University finally resolved the identity of the mysterious Alfred Wallace’s butterfly: it is now going by the name Famegana nisa (comb. nov.), while two other species names (Lycaena alsulus and Zizeeria alsulus eggletoni) were proven to have been coined for the same butterfly after the original description by Wallace. Thereby, the latter two are both synonymised with Famegana nisa.

Type specimen of *Famegana nisa*, collected by Wallace in 1866 (upper side).
Credit: Dr Yu-Feng Hsu (courtesy of NHM)
License: CC-BY 4.0

Despite having made entomologists scratch their heads for over a century, in the wild, the Wallace’s butterfly is good at standing out. As long as one knows what else lives in the open grassy habitats around, of course. Commonly known as ‘Grass Blue’, ‘Small Grass Blue’ or ‘Black-spotted Grass Blue’, the butterfly can be easily distinguished amongst the other local species by its uniformly grayish white undersides of the wings, combined with obscure submarginal bands and a single prominent black spot on the hindwing.

However, the species demonstrates high seasonal variability, meaning that individuals reared in the dry season have a reduced black spot, darker ground colour on wing undersides and more distinct submarginal bands in comparison to specimens from the wet season. This is why Dr Yu-Feng Hsu notes that it’s perhaps unnecessary to split the species into subspecies even though there have been up to four already recognised.

Type specimen of Famegana nisa, collected by Wallace in 1866 (bottom side).
Credit: Dr Yu-Feng Hsu (courtesy of NHM)
License: CC-BY 4.0

***

Alfred Russel Wallace, a British naturalist, explorer, geographer, anthropologist, biologist and illustrator, was a contemporary of Charles Darwin, and also worked on the debates within evolutionary theory, including natural selection. He also authored the famed book Darwinism in 1889, which explained and defended natural selection.

While Darwin and Wallace did exchange ideas, often challenging each other’s conclusions, they worked out the idea of natural selection each on their own. In his part, Wallace insisted that there was indeed a strong reason why a certain species would evolve. Unlike Darwin, Wallace argued that rather than a random natural process, evolution was occurring to maintain a species’ fitness to the specificity of its environment. Wallace was also one of the first prominent scientists to voice concerns about the environmental impact of human activity.

***

Original source:

Hsu Y-F (2020) The identity of Alfred Wallace’s mysterious butterfly taxon Lycaena nisa solved: Famegana nisa comb. nov., a senior synonym of F. alsulus (Lepidoptera, Lycaenidae, Polyommatinae). ZooKeys 966: 153-162. https://doi.org/10.3897/zookeys.966.51921

Contact:

Dr Yu-Feng Hsu, National Taiwan Normal University
Email: t43018@ntnu.edu.tw

New subspecies of the rarest Palaearctic butterfly found in the Arctic Circle of Yakutia

An isolated population of the rarest Palaearctic butterfly species: the Arctic Apollo (Parnassius arcticus), turned out to be a new to science subspecies with distinct looks as well as DNA. Named Parnassius arcticus arbugaevi, the butterfly is described in a recent paper, published in the peer-reviewed, open-access scientific journal Acta Biologica Sibirica.

“Thanks to the field studies of our colleague and friend Yuri Bakhaev, we obtained unique butterfly specimens from the Momsky Range in North-Eastern Yakutia. This mountain range, which is about 500 km long, has until now been a real ‘blank spot’ in terms of biodiversity research,”
explains the lead author of the study, Dr Roman Yakovlev, affiliated with Tomsk State University and Altai State University.

“With the kind permission of Mikhail Ivanov, Director of the Momsky National Park, entomological collections were carried out in various parts of the park. Hard-to-reach areas were visited with the help of inspector Innokenty Fedorov,”
he adds.

Then, amongst the specimens, the scientists spotted butterflies that at first they thought to be the rarest species for the entire Palaearctic: the Arctic Apollo, a species endemic to Russia and North-Eastern Yakutia, which had only been known from the Suntar-Khayata and Verkhoyansk mountains.

Later, however, the team noticed that the curious specimens were larger on average, had more elongated wings compared to the Arctic Apollo, and were also missing the distinct dark spot on the wings. At that moment, they thought they were rather looking at a species currently unknown to science, and belonging to the Parnassius tenedius species group.

Eventually, following in-depth morphological and molecular genetic analyses, the scientists concluded that the population from the Momsky Range was in fact a new subspecies of the Arctic Apollo and can be distinguished by a number of external and DNA differences. They named the new subspecies Parnassius arcticus arbugaevi after German Arbugaev, Director of the ecological-ethnographic complex Chochur Muran, who provided comprehensive assistance to one of the co-authors of the study, Yu.I. Bakhaev, in his research in Yakutia.

The new subspecies inhabits dry scree slopes with poor vegetation at an elevation of 1,400 m. So far, it is only known from the type locality, Momsky Range, North-Eastern Yakutia, where butterflies can be seen from early June to July. The wingspan in males range between 39 and 45 mm.

“Thus, we obtained significant new data on the distribution and taxonomy of one of the rarest butterflies in the North Palaearctic,”
say the researchers in conclusion.

Original source:

Yakovlev RV, Shapoval NA, Bakhaev YI, Kuftina GN, Khramov BA (2020) A new subspecies of Parnassius arcticus (Eisner, 1968) (Lepidoptera, Papilionidae) from the Momsky Range (Yakutia, Russia). Acta Biologica Sibirica 6: 93-105. https://doi.org/10.3897/abs.6.e55925