A molecular phylogeny shows the single origin of the Pyrenean subterranean Trechini ground beetles (Coleoptera: Carabidae)

Faille, Arnaud; Ribera, Ignacio; Deharveng, Louis; Bourdeau, Charles; Garnery, Lionel; Queinnec, Erik; Deuve, Thierry

doi:10.1016/j.ympev.2009.10.008

Cited by 90 publications

(149 citation statements)

References 52 publications

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“…We found clear geographical structuring within the Leptodirini, in agreement with previous results for the same group and for other subterranean organisms [11,14,15,31]. Even if within each of these geographically restricted lineages there were species known to have a modified life cycle, the required minimum number of independent transitions according to our phylogeny was surprisingly low.…”

Section: Discussionsupporting

confidence: 91%

Life-history specialization was not an evolutionary dead-end in Pyrenean cave beetles

2014

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Research on subterranean organisms has focused on the colonization process and some of the associated phenotypic changes, but little is known on the longterm evolutionary dynamics of subterranean lineages and the origin of some highly specialized complex characters. One of the most extreme modifications is the reduction of the number of larval instars in some Leptodirini beetles from the ancestral 3 to 2 and ultimately a single instar. This reduction is usually assumed to have occurred independently multiple times within the same lineage and geographical area, but its evolution has never been studied in a phylogenetic framework. Using a comprehensive molecular phylogeny, we found a low number of independent origins of the reduction in the number of instars, with a single transition, dated to the Oligocene-Miocene, from 3 to 2 and then 1 instar in the Pyrenees, the best-studied area. In the Pyrenees, the 1-instar lineage had a diversification rate (0.22 diversification events per lineage per million years) significantly higher than that of 3-or 2-instar lineages (0.10), and similar to that seen in other Coleopteran radiations. Far from being evolutionary dead-ends, ancient lineages fully adapted to subterranean life seem able to persist and diversify over long evolutionary periods.

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Section: Discussionsupporting

confidence: 91%

Life-history specialization was not an evolutionary dead-end in Pyrenean cave beetles

2014

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“…The major beetle families found in caves are ground beetles (Carabidae: Trechinae), followed by small carrion beetles (Cholevidae or Cholevinae within Leiodidae) and rove beetles (Staphylinidae) (Moldovan, 2005) with large distributions in the palearctic and nearctic ecozones. In addition, a large diversity of aquatic troglobiotic diving beetles (Dytiscidae) has been discovered in Australia (Faille et al, 2010;Leys and Watts, 2008;Leys et al, 2003;Ribera et al, 2010). The Coleoptera are thus an ideal study group to explore the breadth of cave-adaptive states.…”

Section: Introductionmentioning

confidence: 99%

Phototransduction and clock gene expression in the troglobiont beetlePtomaphagus hirtusof Mammoth cave

Friedrich

Chen

Daines

et al. 2011

Journal of Experimental Biology

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SUMMARYObligatory cave species exhibit dramatic trait modifications such as eye reduction, loss of pigmentation and an increase in touch receptors. As molecular studies of cave adaptation have largely concentrated on vertebrate models, it is not yet possible to probe for genetic universalities underlying cave adaptation. We have therefore begun to study the strongly cave-adapted small carrion beetle Ptomaphagus hirtus. For over 100 years, this flightless signature inhabitant of Mammoth Cave, the world's largest known cave system, has been considered blind despite the presence of residual lens structures. By deep sequencing of the adult head transcriptome, we discovered the transcripts of all core members of the phototransduction protein machinery. Combined with the absence of transcripts of select structural photoreceptor and eye pigmentation genes, these data suggest a reduced but functional visual system in P. hirtus. This conclusion was corroborated by a negative phototactic response of P. hirtus in light/dark choice tests. We further detected the expression of the complete circadian clock gene network in P. hirtus, raising the possibility of a role of light sensation in the regulation of oscillating processes. We speculate that P. hirtus is representative of a large number of animal species with highly reduced but persisting visual capacities in the twilight zone of the subterranean realm. These can now be studied on a broad comparative scale given the efficiency of transcript discovery by next-generation sequencing.

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“…Thus, the new species is most likely a representative of the main Trechus clade sensu Faille et al (2013). However, phylogenetic studies have shown that the genus Trechus sensu auctorum is a non-monophyletic assemblage (see Faille et al 2010Faille et al , 2011Faille et al , 2013. In addition, the phylogenetic positions of many of the non-European lineages need still to be investigated.…”

Section: Figs 1-13mentioning

confidence: 98%

“…Within the extant world fauna of Trechini a huge number of anophthalmous and microphthalmous species are described, and their diversity is particularly rich in the southern parts of the Western Palaearctic (e.g., Jeannel 1928, Casale & Laneyrie 1982, Casale et al 1998. It has been shown, however, that different degrees of eye reduction evolved several times independently at least within Trechus sensu lato (Casale 2011, Faille et. al.…”

Section: Figs 1-13mentioning

confidence: 99%

Blind life in the Baltic amber forests: description of an eyeless species of the ground beetle genus Trechus Clairville, 1806 (Coleoptera: Carabidae: Trechini)

Schmidt

Hoffmann

Michalik

2016

Zootaxa

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The first eyeless beetle known from Baltic amber, Trechus eoanophthalmus sp. n., is described and imaged using light microscopy and X-ray micro-computed tomography. Based on external characters, the new species is most similar to species of the Palaearctic Trechus sensu stricto clade and seems to be closely related to the Baltic amber fossil T. balticus Schmidt & Faille, 2015. Due to the poor conservation of the internal parts of the body, no information on the genital characters can be provided. Therefore, the systematic position of this fossil within the megadiverse genus Trechus remains dubious. The occurrence of the blind and flightless T. eoanophthalmus sp. n. in the Baltic amber forests supports a previous hypothesis that these forests were located in an area partly characterised by mountainous habitats with temperate climatic conditions.

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A molecular phylogeny shows the single origin of the Pyrenean subterranean Trechini ground beetles (Coleoptera: Carabidae)

Cited by 90 publications

References 52 publications

Life-history specialization was not an evolutionary dead-end in Pyrenean cave beetles

Life-history specialization was not an evolutionary dead-end in Pyrenean cave beetles

Phototransduction and clock gene expression in the troglobiont beetlePtomaphagus hirtusof Mammoth cave

Blind life in the Baltic amber forests: description of an eyeless species of the ground beetle genus Trechus Clairville, 1806 (Coleoptera: Carabidae: Trechini)

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