@article {58255, title = {A shift toward harmonics for high-frequency calling shown with phylogenetic study of frequency spectra in Eneopterinae crickets (Orthoptera, Grylloidea, Eneopteridae)}, year = {2007}, abstract = {

Dominant frequency is an important feature of cricket song, as it can be used for species recognition and mate choice. The dominant frequency usually ranges from 2 to 8 kHz and corresponds to the fundamental frequency of the song. In preliminary studies we documented high-frequency songs in the subfamily Eneopterinae. To analyse this phenom- enon further, we investigate the spectral properties of these cricket songs. Based on the analysis of the frequency spectra in reference to phylogeny, we show that a shift of dominant frequency from the fundamental toward the second or the third harmonic of the song occurred in the Lebinthini tribe. In this clade the upper harmonics (second or third) become the most powerful frequencies of the song. From an evolutionary point of view, we document a case of convergence toward high-frequency calling between species of Eneoptera Burmeister, 1838, which emit alternatively low and high fundamental frequencies, and the Lebinthini, which emit high frequencies using upper harmonics. Functional hypotheses are discussed to explain how these high frequencies could be produced.

}, doi = {10.1139/Z07-106}, url = {http://www.nrcresearchpress.com/doi/10.1139/Z07-106}, author = {ROBILLARD, TONY and Grandcolas, Philippe and Desutter-Grandcolas, Laure} } @article {58041, title = {Old Lineage on an Old Island: Pixibinthus, a New Cricket Genus Endemic to New Caledonia Shed Light on Gryllid Diversification in a Hotspot of Biodiversity}, year = {2016}, abstract = {

Few studies have focused on the early colonization of New Caledonia by insects, after the re-emergence of the main island, 37 Myr ago. Here we investigate the mode and tempo of evolution of a new endemic cricket genus, Pixibinthus, recently discovered in southern New Caledonia. First we formally describe this new monotypic genus found exclusively in the open shrubby vegetation on metalliferous soils, named \‘maquis minier\’, unique to New Caledonia. We then reconstruct a dated molecular phylogeny based on five mitochondrial and four nuclear loci in order to establish relationships of Pixibinthus within Eneopterinae crickets. Pixibinthus is recovered as thesister clade of the endemic genus Agnotecous, mostly rainforest-dwellers. Dating results show that the island colonization by their common ancestor occurred around 34.7 Myr, shortly after New Caledonia re-emergence. Pixibinthus and Agnotecous are then one of the oldest insect lineages documented so far for New Caledonia. This discovery highlights for the first time two clear-cut ecological specializations between sister clades, as Agnotecous is mainly found in rainforests with 19 species, whereas Pixibinthus is found in open habitats with a single documented species. The preference of Pixibinthus for open habitats and of Agnotecous for forest habitats nicely fits an acoustic specialization, either explained by differences in body size or in acoustic properties of their respective habitats. We hypothesize that landscape dynamics, linked to major past climatic events and recent change in fire regimes are possible causes for both present-day low diversity and rarity in genus Pixibinthus. The unique evolutionary history of this old New Caledonian lineage stresses the importance to increase our knowledge on the faunal biodiversity of \‘maquis minier\’, in order to better understand the origin and past dynamics of New Caledonian biota.

}, doi = {10.1371/journal.pone.0150920}, url = {https://dx.plos.org/10.1371/journal.pone.0150920}, author = {Anso, J{\'e}r{\'e}my and Barrab{\'e}, Laure and Desutter-Grandcolas, Laure and Jourdan, Herv{\'e} and Grandcolas, Philippe and Dong, Jiajia and ROBILLARD, TONY}, editor = {Fontaneto, Diego} } @article {58012, title = {Revision of the cricket genus Cardiodactylus (Orthoptera, Eneopterinae, Lebinthini): the species from both sides of the Wallace line, with description of 25 new species}, journal = {Zootaxa}, volume = {3854}, year = {2014}, month = {Aug-08-2015}, pages = {1}, abstract = {

The genus Cardiodactylus is the most speciose and widely distributed genus of the cricket subfamily Eneopterinae and of the Lebinthini tribe. Along with diverse acoustic features, this genus is also characterized by a wide distribution area running from Japan to Southeast Asia, Northern Australia and in many archipelagos in the Western Pacific, with a high contrast in species distributions. In this paper we start revising Cardiodactylus by focusing on the western region of its wide distribution and the Novaeguineae species group. We describe 25 new species of Cardiodactylus, redescribe 3 species and bring new signalizations for 5 species. Whenever possible, information is provided about species distribution, male calling song and male and female genitalia, forewing venation and habitat.

}, keywords = {Cardiodactylus, Eneopterinae, Gryllidae, new species, revision, Wallace line}, issn = {1175-5326}, doi = {10.11646/zootaxa.3854.110.11646/zootaxa.3854.1.1}, url = {http://biotaxa.org/Zootaxa/issue/view/zootaxa.3854.1}, author = {ROBILLARD, TONY and GOROCHOV, ANDREJ V. and POULAIN, SIMON and SUHARDJONO, YAYUK R.} }