TY - JOUR T1 - Comments on the Malaysian Katydid Ancylecha fenestrata (Fabricius, 1793) (Orthoptera: Tettigoniidae) JF - Entomologie heute Y1 - 2013 A1 - Hartmut Greven A1 - Sabrina Braatz A1 - Dieter Schulten KW - Ancylecha fenestrata KW - aposematism KW - chorion structure KW - reproduction KW - site of oviposition KW - stridulatory apparatus AB -

Ancylecha fenestrata is a rather large phaneropterine tettigoniid from Malaysia with leaf-like tegmina that are characterized by two crescent-like markings. This species is often raised in captivity, but publications about its biology are rare. Searching the internet we found several plants accepted for oviposition, but not for feeding. These plants have relatively fl eshy and leathery leaves and contain various substances (e. g. saponins, oxalic acid, speci fi c glucosides etc.) often harmful at least to verte- brates. Only a few plants appear to be used for both, egg deposition and feeding. Whether this is a strategy pursued by A. fenestrata in the wild, is unkown. Females oserved by us inserted up to 13 large kidney-shaped eggs (per leaf) in the leaf parenchyma of the Spotted Dracaena Dracaena surculosa often used for breeding. The chorion of the egg is composed of a thin, delicate outer layer that apparently forms a close association with the walls of the parenchyma cells of the leaf, followed by a broader spongy layer, a relatively thick and solid layer with dilatations (air spaces) connected by fi ne pore canals that also open out in the large spaces of the spongy layer, and a very thin basal layer. At temperatures of 22 to 25 °C and relatively high humidities, nymphs hatch within 70 days on average. The fi rst nym- phal instars are strikingly multicoloured. In the resting position, in which the forelegs are extended forwards, the hind legs backwards, and the long antennae are hidden under the abdomen, they resem- ble spiders. Males and females of A. fenestrata produce sounds by tegminal stridulation. Stridulatory organs are sexually dimorphic. As typical for many tettigoniids, males possess a strongly sclerotized fi le with “teeth” ( pars stridens ) on the underside of the left tegmen base and on the upper surface a scraper ( plectrum ) near to the so-called mirror. Females lack a mirror possessing several small fi les with laterally cuspidate teeth on the upper surface of the right tegmen, whereas the underside of the left tegmen is not conspicuously modi fi ed. When disturbed, both sexes produce alarm or defence sounds.

VL - 25 ER - TY - JOUR T1 - Auditory fovea in the ear of a duetting katydid shows male-specific adaptation to the female call JF - Current Biology Y1 - 2016 A1 - Scherberich, Jan A1 - Hummel, Jennifer A1 - Schöneich, Stefan A1 - Nowotny, Manuela AB -

Convergent evolution has led to surprising functional and mechanistic similarities between the vertebrate cochlea and some katydid ears 1 ;  2. Here we report on an ‘auditory fovea’ (Figure 1A) in the duetting katydid Ancylecha fenestrata (Tettigoniidae). The auditory fovea is a specialized inner-ear region with a disproportionate number of receptor cells tuned to a narrow frequency range, and has been described in the cochlea of some vertebrates, such as bats and mole rats 3 ;  4. In tonotopically organized ears, the location in the hearing organ of the optimal neuronal response to a tone changes gradually with the frequency of the stimulation tone. However, in the ears of A. fenestrata, the sensory cells in the auditory fovea are tuned to the dominant frequency of the female call; this area of the hearing organ is extensively expanded in males to provide an overrepresentation of this behaviorally important auditory input. Vertebrates developed an auditory fovea for improved prey or predator detection. In A. fenestrata, however, the foveal region facilitates acoustic pair finding, and the sexual dimorphism of sound-producing and hearing organs reflects the asymmetry in the mutual communication system between the sexes ( Figures 1B, S1).

VL - 26 UR - http://linkinghub.elsevier.com/retrieve/pii/S0960982216312611 IS - 23 JO - Current Biology ER - TY - JOUR T1 - Position-dependent hearing in three species of bushcrickets (Tettigoniidae, Orthoptera) JF - Royal Society Open Science Y1 - 2015 A1 - Lakes-Harlan, Reinhard A1 - Scherberich, Jan VL - 2 UR - http://rsos.royalsocietypublishing.org/lookup/doi/10.1098/rsos.140473https://syndication.highwire.org/content/doi/10.1098/rsos.140473 IS - 6 JO - R. Soc. open sci. ER -