@article {52556, title = {Is it a bird, is it a frog or a bush cricket? On an enigmatic nocturnal calling song recorded at different locations in southern Bahia, Brazil (Orthoptera, Tettigoniidae, Paracycloptera grandifolia )}, journal = {Spixiana}, volume = {40}, year = {2017}, pages = {189-192}, chapter = {189}, abstract = {

After more than ten years of fieldworks in southern Bahia registering an enigmatic vocalization we were finally able to identify the source of it. The calls were emitted by Paracycloptera grandifolia , a katydid belonging to the Tettigoniidae. Its call lasts between 0.5 - 1.3 seconds and consists of 7 - 8 groups of pulses. The dominant frequency lies at 3 kHz.

}, author = {Iuri Ribeiro Dias and Juliana Chamorro-Rengifo and Mirco Sol{\'e}} } @article {51484, title = {Song Structure and Description of Some Costa Rican Katydids (Orthoptera: Tettigoniidae)}, journal = {Transactions of the American Entomological Society}, volume = {108}, year = {1982}, pages = {287-314}, chapter = {287}, abstract = {

The physical features of the calling songs of a dozen species of Tettigoniidae from Costa Rica are recorded and analyzed. A new species, Cocconotus pusillus, is described from the cloud forest.

Several forms from the understory of lowland rainforest utilize high-Q (sinusoidal) carrier frequencies in the ultrasonic range and to this end the sound generating regions of the tegmina are uniquely strengthened. Relative to other katydids, these insects show what may be adaptations for avoidance of predatory bats: elongate antennae, lowered thresholds for elicitation of defensive behaviour and a severely curtailed signal emission time. It is proposed that reduced signal dura tion has placed a selective premium on localization efficiency during pair formation. The ultrasonic pure tone carrier, functioning in conjunction with highly directional ear slits, may be an adaptation to enhance localization.

}, url = {http://www.jstor.org/stable/25078301}, author = {Glenn K. Morris and Max Beier} } @article {51475, title = {Wing resonances in a new dead-leaf-mimic katydid (Tettigoniidae: Pterochrozinae) from the Andean cloud forests}, journal = {Zoologischer Anzeiger - A Journal of Comparative Zoology}, volume = {270}, year = {2017}, month = {Jan-09-2017}, pages = {60 - 70}, abstract = {

Day-camouflaged leaf-mimic katydids Typophyllum spp. have a remarkable way of evading predators as male and female forewings appear as bite-damaged leaves complete with necrotic spots. As in all other katydids, males produce sound signals to attract females by rubbing their forewings together. The biophysical properties of these special leaf-like forewings remain obscure. Here we study the wing mechanics and resonances of Typophyllum spurioculis, a new species of leaf-mimic katydid with a broad distribution in the Andes from Western Ecuador to the middle Central Cordillera in Colombia. This species performs an unusual laterally directed aposematic display, showing orange spots that simulate eyes at the leg base. At night, males are conspicuous by their loud, audible calling songs, which exhibit two spectral peaks at ca. 7 and 12 kHz. Using micro-scanning laser Doppler vibrometry we find the effective sound radiators of the wings (speculae) vibrate with three modes of vibration, two of which include the frequencies observed in the calling song. Remarkably, this resonance is preserved in the parts of the wings mimicking necrotic leaves, which are in theory not specialised for sound production. The eyespot function is discussed.

}, keywords = {bush-cricket, katydid, mimetism, resonance, stridulation}, issn = {00445231}, doi = {10.1016/j.jcz.2017.10.001}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0044523117300748}, author = {Baker, Andrew and Sarria-S, Fabio A. and Glenn K. Morris and Jonsson, Thorin and Montealegre-Z, Fernando} } @article {50909, title = {Morphological determinants of carrier frequency signal in katydids (Orthoptera): a comparative analysis using biophysical evidence}, journal = {Journal of Evolutionary Biology}, year = {2017}, month = {Apr-09-2018}, abstract = {

Male katydids produce mating calls by stridulation using specialized structures on the forewings. The right wing (RW) bears a scraper connected to a drum-like cell known as the mirror and a left wing (LW) that overlaps the RW and bears a serrated vein on the ventral side, the stridulatory file. Sound is generated with the scraper sweeping across the file, producing vibrations that are amplified by the mirror. Using this sound generator, katydids exploit a range of song carrier frequencies (CF) unsurpassed by any other insect group, with species singing as low as 600 Hz and others as high as 150 kHz. Sound generator size has been shown to scale negatively with CF, but such observations derive from studies based on few species, without phylogenetic control, and/or using only the RW mirror length. We carried out a phylogenetic comparative analysis involving 94 species of katydids to study the relationship between LW and RW components of the sound generator and the CF of the male\&$\#$39;s mating call, while taking into account body size and phylogenetic relationships. The results showed that CF negatively scaled with all morphological measures, but was most strongly related to components of the sound generation system (file, LW and RW mirrors). Interestingly, the LW mirror (reduced and non-functional) predicted CF more accurately than the RW mirror, and body size is not a reliable CF predictor. Mathematical models were verified on known species for predicting CF in species for which sound is unknown (e.g. fossils or museum specimens).

}, doi = {10.1111/jeb.13179}, url = {http://doi.wiley.com/10.1111/jeb.13179}, author = {Fernando Montealegre-Zapata and Ogden, Jessica and Jonsson, Thorin and Soulsbury, Carl D.} }