Tag: Coleoptera

Citizen scientists discover pinhead-sized beetle in Borneo

The discovery is the latest in a series of newly described species collected as part of the Taxon Expeditions initiative aiming to bring biodiversity and taxonomy closer to the layperson

How many citizen scientists does it take to discover a new species? A recent expedition to the Ulu Temburong forest in Borneo proved that you only need 10 enthusiasts with no professional training, yet fueled with curiosity and passion for the outdoors, to find a new beetle the size of a pinhead in leaf litter.

*The newly discovered species of leaf beetle, Clavicornaltica belalongensis Photo by Taxon Expeditions – Pierre Escoubas.*

The species, named Clavicornaltica belalongensis, is a tiny, 1.25-mm-long leaf beetle that eats moss on the forest floor. Published in the open-access Biodiversity Data Journal, it is the latest discovery from Taxon Expeditions, an initiative that organises scientific field trips to remote and biodiverse locations for teams of scientists and laypeople.

*The Ulu Temburong forest, Borneo. Photo by Taxon Expeditions – Pierre Escoubas.*

Unlike other science/adventure trips, Taxon Expeditions gives a unique opportunity for laypeople, or citizen scientists, to describe and publish new species of animals and focus on the thousands of ‘little things that run the world’. Thanks to the initiative, they learn about tropical biology techniques while participating in the process of taxonomy and the study of hidden biodiversity.

The new beetle, for example, is one of hundreds of thousands of tiny beetle species that inhabit the leaf litter of tropical forests and have remained unknown and scientifically unnamed up to our days.

In a YouTube video, Simon Berenyi, who joined the expedition along with his 14-year-old son, says: ‘I had no idea how special this would be; you become a student again – you become a child again.’

Entomologist and founder of Taxon Expeditions, Dr. Iva Njunjić explains: ‘We introduce the general public to all these tiny, beautiful, and completely unknown animals, and show them that there is a whole world still to be discovered.’

Last year, another survey in Borneo organised by Taxon Expeditions ended up with the description of a new water beetle species (Grouvellinus leonardodicaprioi). Named after famous Hollywood actor and environmentalist Leonardo DiCaprio. The discovery raised a real furore on the public scene, culminating in the new insect making an appearance on the profile image of the celebrity’s facebook page.

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Original source:

Schilthuizen M, Berenyi A, Limin A, Brahim A, Cicuzza D, Eales A, Escoubas P, Grafe U, de Groot M, Hayden W, Paterno M, Jambul R, Slik J, Ting Teck Wah D, Tucker A, Njunjić I (2019) A new species of Clavicornaltica (Coleoptera: Chrysomelidae), discovered and described on a field course to Kuala Belalong, Brunei. Biodiversity Data Journal 7: e32555. https://doi.org/10.3897/BDJ.7.e32555

The first case of a Portuguese beetle living exclusively in groundwater

New to science, the species was named after Pluto, the ruler of the underworld in Greek mythology

A diving beetle demonstrating various adaptations to the life underground, including depigmentation and evolutionary loss of eyes, was discovered at the bottom of a clay pound in the cave Soprador do Carvalho, Portugal. The species turned out to be the very first in the whole order of beetles (Coleoptera) to be known exclusively from the underground waters of the country.

*The Soprador do Carvalho cave (Portugal) is the type locality of the newly described species Iberoporus pluto. Photo by Ignacio Ribera.*

Despite not being able to find any other specimens during their study – save for the single female, the team of Dr Ignacio Ribera, Institute of Evolutionary Biology (Spain) and Prof Ana Sofia P. S. Reboleira, University of Copenhagen (Denmark) identified the beetle as new to science, thanks to its unambiguous morphology in combination with molecular data.

*Profile view of the newly described species Iberoporus pluto. Photo by Ignacio Ribera.*

Aptly named Iberoporus pluto in reference to the ruler of the underworld in Greek mythology Pluto, the species was recently described in the open-access journal ZooKeys.

With a uniformly pale orange body measuring 2.8 mm in length and 1.1 mm in its widest part, the beetle is larger than the rest species known in its genus, and its appendages are longer and more slender. While blindness and depigmentation are clear adaptation to life away from sunlight, the elongated limbs and antennae reflect poor swimming abilities needed in a subterranean habitat. Going for 4 km in horizontal direction, Soprador do Carvalho is the largest in the Dueça cave system, located in the north-eastern part of the Sicó karst area in central Portugal. In recent years, the cave is being explored for tourism.

“The knowledge of the subterranean fauna from Portugal has significantly increased over the last decade, with the description of a high number of obligate subterranean species (tripling their number) and the establishment of new biogeographic patterns,” explain the authors of the study. “A high number of these species are stygobiont (i.e. confined to groundwater), mostly from wells in the north of the country, where evapotranspiration is higher.”

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Original source:

Ribera I, Reboleira ASPS (2019) The first stygobiont species of Coleoptera from Portugal, with a molecular phylogeny of the Siettitia group of genera (Dytiscidae, Hydroporinae, Hydroporini, Siettitiina). ZooKeys 813: 21-38. https://doi.org/10.3897/zookeys.813.29765

Beetle named after actress & biologist Isabella Rossellini for her series about animals

A new species of beetle with remarkably long genitalia that hint at a curious evolutionary “sexual arms race” has been described from Malaysian Borneo.

The new insect was named after actress and biologist Isabella Rossellini in honour of her stage shows and Webby Award-winning series of films about animal reproduction, featured on SundanceTV.

The species is described by scientists Menno Schilthuizen and Iva Njunjic of Naturalis Biodiversity Center and Universiti Malaysia Sabah, and Michel Perreau, Sorbonne Université, Paris. Their paper is published in the open access journal ZooKeys.

The new species, Ptomaphaginus isabellarossellini, finds a place among the 30 known species of round fungus beetles (subfamily Cholevinae) recorded by the authors from the island of Borneo. Of these, there are a total of 14 which had remained unknown to science until now.

The reason why the scientists named this particular species after the famous actress is its genitalia. The beetle’s penis carries a long, whip-like thread, called flagellum, whereas the female has a similarly long tube leading up to a sperm storage organ.

Lead author Menno Schilthuizen, who himself has previously released a simultaneously educative and entertaining book about the evolution of genitals, says that such exaggerated male and female genitalia often betray an “evolutionary sexual arms race”.

On the male side, natural selection favours longer genitalia because of the ability to directly reach the female’s sperm storage organ. However, female beetles would rather retain their right to favour the DNA of a certain mate over the rest. The upshot is that, over long periods of evolution, penises get longer and vaginas get deeper. Similar evolutionary genital exaggeration is also known in rove beetles and ducks.

“This is better than winning the Oscar,” says honoured Isabella Rossellini.

The Italian-born actress, filmmaker, author, philanthropist, and model has even featured the new beetle in her new Link Link Circus stage shows. Dealing with animal behaviour, the series will be touring theaters in Europe this fall.

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Original source:

Schilthuizen M, Perreau M, Njunjic I (2018) A review of the Cholevinae from the island of Borneo (Coleoptera, Leiodidae). ZooKeys 777: 57-108. https://doi.org/10.3897/zookeys.777.23212

Citizen scientists discover a new water beetle and name it after Leonardo DiCaprio

New animal species are sometimes named after celebrities because of their trademark looks. That’s how we got the blonde-haired Donald Trump moth and the big-armed Arnold Schwarzenegger fly, to name a few. However, some well-known people are enshrined in animal names not for their looks, but rather for what they do for the environment.

This is exactly how a newly discovered water beetle, described in the open access journal ZooKeys, was given the name of Hollywood actor and environmentalist Leonardo DiCaprio. The tribute marks the 20th anniversary of the celebrity’s Leonardo DiCaprio Foundation (LDF) and its efforts towards biodiversity preservation.

The Leonardo DiCaprio Foundation has become one of the world’s foremost wildlife charities, having contributed to over 200 grassroots projects around the globe devoted to climate change mitigation, wildlife conservation, and habitat preservation.

“We can all have an impact,” says DiCaprio in a special LDF video, “but we have to work together to protect our only home.”

Going by the scientific name of Grouvellinus leonardodicaprioi, the new water beetle was discovered at a waterfall in the remote Maliau Basin, Malaysian Borneo, during the first field trip initiated by Taxon Expeditions – an organisation which arranges scientific surveys for untrained laypeople with the aim to discover previously unknown species and bridge the gap in biodiversity knowledge.

Having identified a total of three water beetle species new to science, the expedition participants and the local staff of the Maliau Basin Studies Centre voted to name one of them after DiCaprio in honour of his efforts to protect untouched, unexplored wildernesses just like Maliau Basin itself.

“Tiny and black, this new beetle may not win any Oscars for charisma, but in biodiversity conservation, every creature counts,” said Taxon Expeditions’ founder and entomologist Dr. Iva Njunjic.

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Original source:

Freitag H, Pangantihon CV, Njunjic I (2018) Three new species of Grouvellinus Champion, 1923 from Maliau Basin, Sabah, Borneo, discovered by citizen scientists during the first Taxon Expedition (Insecta, Coleoptera, Elmidae). ZooKeys 754: 1-21. https://doi.org/10.3897/zookeys.754.24276

Citizen scientists discover 6 new species of beetles in Borneo

Scientists estimate that 80% of the world’s animal and plant species are still unknown. Although the work of taxonomists (whose job is to describe and name those) is appreciated by the general public, funding for taxonomy is dwindling. Moreover, while the areas hosting most of the unknown biodiversity are under threat, time is running out.

To help solve this problem, Taxon Expeditions has become the first organisation in the world to initiate field courses for citizen scientists in biodiversity hotspots, with the aim of discovering, describing, naming, and publishing new species under the slogan “You can be Darwin too”.

“Relying on extra hands means that unknown species can be discovered faster and,” says Taxon Expeditions director and biologist Dr. Iva Njunjic, “for some of that work, you don’t even need to be a trained taxonomist.”

Taxon Expedition’s first field course to the remote 30-kilometre-wide Maliau Basin in Malaysian Borneo, yielded six new species. Three of those, all tiny beetles living in rainforest leaf litter, are published today in the Biodiversity Data Journal. The other three, belonging to the family Elmidae (riffle beetles) will be published next year.

Citizen scientists discovered these species during a field exercise employing the method of ‘Winkler extraction’. Using this technique, dead leaves are collected from the rainforest floor before being sieved, so that hundreds of tiny soil-dwelling insects can be revealed.

Professor Menno Schilthuizen recognised three of those as new species. Under his guidance, the participants studied, photographed and drew the specimens in the expedition’s field lab, extracted their DNA and finalised a draft ready for publication.

The participants also came up with the original names for the three new species. English teacher Sean Otani from Japan decided to name Colenisia chungi after Malaysian entomologist Arthur Chung. The names for Clavicornaltica sabahensis and Dermatohomoeus maliauensis referring to the studied sites were suggested by staff and rangers of Maliau Conservation Area during the farewell party for the course.

All collected samples are deposited in the insect collection of Universiti Malaysia Sabah and the rest of the results – in online databases. This way, these discoveries will help other biologists working on Borneo’s biodiversity.

In March 2018, Taxon Expeditions will again head for Maliau Basin with a new group of participants, hopefully discovering more new species for science. Meanwhile, this year’s team look back on having contributed to real scientific discoveries.

“I had no idea how different, how exciting, how interesting it was going to be. It has been an amazing experience,” says retired corporate account manager Mary Erickson from Canada.

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Original source:

Schilthuizen M, Seip LA, Otani S, Suhaimi J, Njunjic I (2017) Three new minute leaf litter beetles discovered by citizen scientists in Maliau Basin, Malaysian Borneo (Coleoptera: Leiodidae, Chrysomelidae). Biodiversity Data Journal 5: e21947. https://doi.org/10.3897/BDJ.5.e21947

Nature Conservation Special: Guidelines for the monitoring of beetles protected in Europe

In a follow-up to a recent special issue, 8 research articles outline a set of verified guidelines for the monitoring of 5 saproxylic beetle species listed in the Habitats Directive

In a set of eight research publications, scientists tested various methods for the monitoring of five European saproxylic (i.e. dependent on dead wood) beetle species protected by the Habitats Directive. The aim of their work was to test and propose a standard method for each species. A key role in this conservation initiative was played by citizen scientists who made it possible for sufficient data to be collected within a significantly shorter time frame.

The special issue “Guidelines for the monitoring of the saproxylic beetles protected in Europe” is the second in succession published in the open access journal Nature Conservation. Both are produced within the framework of the European Union’s LIFE Programme Project “Monitoring of insects with public participation” (LIFE11 NAT/IT/000252 MIPP) and were presented at the European Workshop held in Mantova in May 2017. Colonel Franco Mason, project manager of the MIPP project, notes that the workshop was aimed primarily at monitoring of saproxylic beetles.

While the first article collection focused on reporting recent findings derived from monitoring surveys across the European Union, the papers in the latest issue are devoted to testing various methods for the monitoring of five selected species of protected beetles, in order to determine the most efficient methods and, subsequently, to propose them as standard methods.

Curiously, the public participation in the project was not limited to ecology and entomology semi-experts and aficionados. The team specifically targeted children when recruiting volunteers. One of the dissemination activities of the MIPP project was the “MIPP-iacciono gli insetti” (translated to “I like insects” from Italian), where 3000 students from primary to high school undertook 60 activities per year in order to learn how to locate and identify the target insects.

“Participation by children in environmental education programmes seems to have a great impact on their attitude and behaviour,” notes Giuseppe Carpaneto, Roma Tre University and his co-authors in their introductory article.

“Some studies have shown that children who participate in such programmes are more concerned about nature, want to learn more about environmental issues and are more prone to follow pro-environmental behaviour (e.g. waste recycling) than children who did not participate”.

In another article, included in the special issue, Fabio Mosconi of the Italian Agricultural Research Council and Sapienza University of Rome and his co-authors tested whether a specially trained Golden Retriever could locate the threatened hermit beetle faster and more efficiently than scientists using the standard “wood mould sampling” method.

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Additional information:

About the Life project MIPP

The main objective of the project MIPP is to develop and test methods for the monitoring of five beetle species listed in Annexes II and IV of the Habitats Directive (Osmoderma eremita, Lucanus cervus, Cerambyx cerdo, Rosalia alpina, Morimus funereus).

Special Nature Conservation issue: Monitoring protected insects in the European Union

A collection of thirteen research papers has been published to address the conservation of saproxylic beetles and other insects listed in the Habitats Directive

With biodiversity loss well underway, conservation measures are urgent on a global scale and the European Union is no exception. However, for efficient strategies and actions to be put in place, plenty of information, acquired primarily through monitoring, is needed to identify priorities for the conservation of threatened species, also for the elusive saproxylic insects, an ecological group of species that depends on dead wood.

Monitoring and conservation of elusive invertebrates is a particularly complex task, as shown in the papers comprising the special issue “Monitoring of saproxylic beetles and other insects protected in the European Union,” supported by the EU’s LIFE Programme and published in the open access journal Nature Conservation. This special issue was produced in the framework of the Life Project “Monitoring of insects with public participation” (LIFE11 NAT/IT/000252 MIPP) and is a direct result of a European Workshop held in Mantova in May, 2017.

Colonel Franco Mason, project manager of the MIPP project, notes that the European Workshop was aimed primarily at monitoring of saproxylic beetles. The project MIPP resulted in two special issues: “Monitoring of saproxylic beetles and other insects protected in the European Union” and “Guidelines for the Monitoring of saproxylic beetles and other insects protected in the European Union“. The first one is now available in the open access journal Nature Conservation.

*This is a female European stag beetle equipped with a radio transmitter in order to detect oviposition sites.*

“No knowledge exists of the success rate of monitoring elusive invertebrates,” writes Dr. Arno Thomaes, Research Institute for Nature and Forest, Belgium, and his team in their paper assessing the feasibility of monitoring the European stag beetle. Having conducted their analysis, though, the scientists conclude that, “monitoring of stag beetles is feasible and the effort is not greater than that which has been found for other invertebrates.”

Alessandro Campanaro, a researcher at the “Bosco Fontana” National Center of Carabinieri, highlights the fundamental role of Citizen Science as an essential tool for acquiring data on species, while simultaneously increasing the public awareness about Natura 2000 and the role of saproxylic species in forests.

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Additional information:

About the Life project MIPP

The main objective of the project MIPP is to develop and test methods for the monitoring of five beetle species listed in the Annexes II and IV of the Habitats Directive (Osmoderma eremita, Lucanus cervus, Cerambyx cerdo, Rosalia alpina, Morimus funereus).

New proposal for a subspecies definition triggered by a new longhorn beetle subspecies

The discovery of a new subspecies of longhorn beetle from Scandinavia triggered a discussion on the vague organism classification rank ‘subspecies’.

As a result, a newly proposed definition of subspecies has been published along with the description of the taxon in the open access journal ZooKeys by the research team of Henrik Wallin and Johannes Bergsten from the Swedish Museum of Natural History and Torstein Kvamme from the Norwegian Institute of Bioeconomy Research.

The northernmost populations of Saperda populnea display a number of divergent traits, including a shorter male antenna and reduced pubescens. In contrast with their most closely related subspecies (Saperda populnea populnea), whose favourite host plant, amongst others, is the European aspen, the new subspecies (Saperda populnea lapponica) specialised exclusively on downy willow (Salix lapponum).

According to the once no less disputed definition of species, regardless of their unique traits, populations cannot be considered as separate species until they are no longer able to produce fertile offspring according to the Biological Species concept, this being one of a number of proposed species concepts. A consensus is emerging around the unified species concept defining species as separately evolving (meta) population lineages.

However, differentiating between subspecies nowadays is a significantly tougher task, since there is no stable definition of the rank yet. Through the years, there have been various explanations of what a subspecies is and what criteria it needs to meet in order to be classified as one.

Compared to previous definitions, the researchers decode it quite simply. To them, the only necessary attributes a population needs to possess before being deemed a subspecies are that they are a potentially incipient new species; diagnosed by at least one heritable trait; and either partially or completely isolated geographically.

Furthermore, they refute a number of factors, including reciprocal monophyly in neutral markers, the “75% rule”, reproductive compatibility and the degree of gene flow.

The concept of subspecies has been so problematic that there have been even those scientists who have argued that taxonomy needs to discard it altogether.

However, the authors note that it is already formally recognised by the International Commission on Zoological Nomenclature (ICZN 1999), “albeit without giving any advice or criteria for its recognition.”

“The concept is more than a mere academic debate as subspecies are recognized in various Red Lists and conservation programs, and hence the recognition as a subspecies or not can have legal and monetary consequences.”

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Original source:

Wallin H, Kvamme T, Bergsten J (2017) To be or not to be a subspecies: description of Saperda populnea lapponica ssp. n. (Coleoptera, Cerambycidae) developing in downy willow (Salix lapponum L.). ZooKeys 691: 101-148. https://doi.org/10.3897/zookeys.691.12880

Two new beetle genera and 4 new species from the Australopacific in a new monograph

An outstanding monograph of the Australopacific Region’s saprinine hister beetles supported by the Alexander von Humboldt Foundation

Amid his ongoing revisionary work on a number of hister beetle genera, the Slovakian-born naturalised Dutch entomologist and Alexander von Humboldt Foundation researcher, Dr. Tomáš Lackner, Bavarian State Collection of Zoology, together with fellow entomologist Dr. Richard Leschen, Landcare Research, discovered two new genera and a total of four new species from the Australopacific Region. The newly described endemic insects are featured in an extensive monograph published in the open access journal ZooKeys.

Hister beetles, also known as Clown beetles because of their flattened legs, represent a quite diverse family (Histeridae) of beetles living almost everywhere around the world. Amongst their characteristic traits are their shiny metallic wings. Most of these beetles are predaceous and feed on larvae of other insects, including some pests. Occasionally, some species filter-feed on dung. Curiously, the Clown beetles tend to play dead when threatened.

While the hister beetle subfamily Saprininae is common and diverse throughout the globe, with only 40 species in nine native and three introduced genera, they are poorly represented in the Australopacific Region. This is one of the reasons the present discoveries documenting the new diversity in the group are remarkable.

The authors note that their scarcity in the area might be as a result of the long-standing isolation of the Australian continent in combination with the originally densely forested large islands like New Zealand and New Guinea.

However, “the Australopacific Region harbors several species with very interesting morphologies and ecologies,” point out the scientists.

Amongst the most impressive newly described saprinines, there is the first truly myrmecophilous species and genus (Iridoprinus myrmecophilus) known from the region, which is likely to be dependent on its co-habitation with ants. The beetle is only known from Australia where it has been collected from the nests of another species, endemic to the country – the Meat anSimilarly, the new histerid species Saprinus rarus is the first known termitophilous saprinine from the Australopacific Region and only the third in the subfamily as a whole. Found in the nest of the arboreal Tree termite, the species had been previously collected, but it has been so rare that it has not been determined as a new to science species until now. Hence, it earned the scientific name rarus as in ‘rare’.

In conclusion, the team noted the next challenge about the Australopacific saprinines – the genus Saprinodes which is not only restricted to Australia, but also has a life history shrouded in mystery. So far, it has only been collected from pitfalls and flight intercept traps.

For lead author Dr. Tomáš Lackner, this is the tenth in a line of studies focused on the world’s remarkable histerids published in ZooKeys.

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Original source:

Lackner T, Leschen RAB (2017) A monograph of the Australopacific Saprininae (Coleoptera, Histeridae). ZooKeys 689: 1-263. https://doi.org/10.3897/zookeys.689.12021

About Alexander von Humboldt Foundation:

The Alexander von Humboldt foundation is an intermediary organisation for German foreign cultural and educational policy promoting international cultural dialogue and academic exchange. It offers flexible sponsorship programmes for researchers at all stages of their careers to enable outstanding scientists and scholars from abroad to complete long-term research stays in Germany.

Champions of biodiversity: A weevil genus beats records of explosive evolutive radiation

With as many as 120 recently discovered weevils placed in the genus Laparocerus, it now hosts a total of 237 known species and subspecies. They are all flightless beetles and most of them endemic (living exclusively in one geographic location) to a single island of the archipelagos of Madeira, Selvagens and the Canary Islands (17 islands in total). Only two species inhabit Morocco, the nearest continental land.

Independent Canarian entomologist Dr. Antonio Machado, who has been collecting and studying this genus of weevils for the last sixteen years and researched 46,500 specimens so far, was helped by geneticist Dr. Mariano Hernández, from the University of La Laguna, Tenerife, Canary Islands, Spain, to undertake a phylogenetic study using three mitochondrial genes and one nuclear gene. The resulting phylogenetic tree also allowed for estimating the whole evolutionary process along a timeframe of about 11.2 million years. Their study is published in the open access journal ZooKeys.

The molecular analysis confirms that all Laparocerus weevils have a common evolutionary ancestor (monophyly), but could not clarify whether that ancient founding species arrived from southern Europe or northwestern Africa. The two extant Moroccan species were found to be the result of a back-colonisation from the Canary Islands to Africa, and not the ancestral source lineage, which unfortunately is still unknown.

Colonisation of Macaronesia started in Porto Santo, Madeiran archipelago, which is the oldest island, and from there it ‘jumped’ to Madeira and the Desertas. The colonisation of the Canary Islands started shortly after, and it basically moved stepwise from the east to the west in line with the decreasing age of the volcanic islands. Yet, there have been several back-colonisations, as well (see map). Large islands, such as Tenerife (2034 km2), ended up with 65 species and subspecies. Globally, there is an outstanding ratio of one endemic Laparocerus for each 35.7 km2; a record not beaten by any other genus of plant or animal in Macaronesia.

The evolutionary process responsible for such richness comprises sequential radiation events in these archipelagoes, each generating several monophyletic groups. These groups, 20 in total, have been recognised as subgenera of Laparocerus, and five of them — Aridotrox, Belicarius, Bencomius, Canariotrox, and Purpuranius — are described as new to science in this study. Colonisation routes, habitat shifts, disruption of populations by volcanism, dispersal by massive landslides, and other relevant aspects for adaptive and non-adaptive radiation, are largely discussed and confronted with previously published data referring to other groups of beetles or to other biological organisms (spiders, bush crickets, plants, etc.).

“If oceanic islands have been traditionally considered as laboratories of evolution and species-producing machines, Laparocerus will become the ideal guinea-pig for broadening studies in dispersal and speciation processes of all kinds,” say the authors. “Working with such a group is like getting a picture of Nature with more pixels. Several intriguing cases highlighted in this contribution may turn into the inspiration for further phylogeographic research.”

The scientists hope that, in near future Laparocerus will merit sharing the podium with Darwin´s finches or Drosophila in the studies of island evolution”.

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Original source:

Machado A, Rodríguez-Expósito E, López M, Hernández M (2017) Phylogenetic analysis of the genus Laparocerus, with comments on colonisation and diversification in Macaronesia (Coleoptera, Curculionidae, Entiminae). Zookeys 651: 1-77 (02 Feb 2017) https://doi.org/10.3897/zookeys.651.10097