01687nas a2200229 4500008004100000022001400041245012600055210006900181260001600250300000800266490000900274520095700283653001601240653001301256653001301269653001701282653001501299100002801314700003201342700002601374856005701400 2013 eng d a1175-532600aThe spider-like katydid Arachnoscelis (Orthoptera: Tettigoniidae: Listroscelidinae): anatomical study of the genus0 aspiderlike katydid iArachnoscelisi Orthoptera Tettigoniidae List cApr-06-2013 a5910 v36663 a

This paper provides some observations on the anatomy of the neotropical katydid Arachnoscelis arachnoides Karny (In- secta: Orthoptera: Tettigoniidae). Arachnoscelis is a genus of predaceous katydids that comprise species that resemble spi- ders in their general body appearance. The type species, A. arachnoids, was described in 1891 from a single male collected in Colombia. Following the original description, these creatures were never found again, and were thought to have gone extinct or mistakenly assigned to the type locality. But between 1891 and 2012 four more species were described and in- correctly assigned to Arachnoscelis based on a similarity of body form. In this paper we present an anatomical comparai- son of Arachnoscelis and its relatives, and propose that Arachnoscelis should be treated as a monotypic genus. This implies that other species previously described in Arachnoscelis, should be placed in different genera.

10abushcricket10aColombia10apredator10astridulation10aultrasound1 aMontealegre-Z, Fernando1 aCadena-Castaneda, Oscar, J.1 aChivers, Benedict, D. uhttp://biotaxa.org/Zootaxa/issue/view/zootaxa.3666.402155nas a2200241 4500008004100000022001400041245012900055210006900184260001600253300001200269490000700281520136500288653001701653653001301670653001901683653001701702653001501719100002601734700002001760700003201780700003301812856006801845 2014 eng d a0952-462200aUltrasonic reverse stridulation in the spider-like katydid Arachnoscelis (Orthoptera: Listrosceledinae)0 aUltrasonic reverse stridulation in the spiderlike katydid iArach cFeb-01-2014 a67 - 770 v233 a

This paper illustrates the biomechanics of sound production in the neotropical predaceous katydid Arachnoscelis arachnoides (Insecta: Orthoptera: Tettigoniidae). Described and previously known from only one male specimen, this genus of predaceous katydids resembles spiders in their general body appearance. To call distant females, male katydids produce songs by stridulation where one forewing possessing a sclerotized file rubs against a row of teeth (scraper) on the other wing. In most katydid species, the songs are produced during the wing-closing phase of the stridulation. Morphological comparative studies of the stridulatory apparatus of the type specimen of Arachnoscelis arachnoides and males of other closely related species suggest that this insect sings with a frequency of ca. 80 kHz to attract conspecific females. We found an abundant population of A. arachnoides in Central Northeast of Colombia and undertook a complete analysis of the biomechanics of stridulation in this species. Using ultrasound-sensitive equipment and high-speed video, we determined that male A. arachnoides sing at ca. 74 kHz and use elastic energy and wing deformation to reach such ultrasonic frequencies. In contrast to most katydids, males of this species produce their calls during the opening phase of the wing; this form of stridulation is discussed.

10abiomechanics10aColombia10aelastic energy10astridulation10aultrasound1 aChivers, Benedict, D.1 aJonsson, Thorin1 aCadena-Castaneda, Oscar, J.1 aMontealegre-Zapata, Fernando uhttp://www.tandfonline.com/doi/abs/10.1080/09524622.2013.816639