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Acoustic Signals and Systematics of False-Leaf Katydids from Ecuador (Orthoptera, Tettigoniidae, Pseudophyllinae)

Glenn K. Morris, Dita E. Klimas and David A. Nickle
Transactions of the American Entomological Society (1890-)
Vol. 114, No. 3/4 (Dec., 1988), pp. 215-263
Stable URL: http://www.jstor.org/stable/25078438
Page Count: 49
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Acoustic Signals and Systematics of False-Leaf Katydids from Ecuador (Orthoptera, Tettigoniidae, Pseudophyllinae)
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Abstract

The physical structure of male calling songs is recorded and analysed for nine species of false-leaf katydids (Pseudophyllinae, Tettigoniidae) from Ecuador. One new species from Pacific lowland rainforest, Docidocercus chlorops, is described. Redescriptions are provided for eight species. Keys permit identification of Ecuadorean species of Leurophyllum and Teleutias. Spectra are characterized by the emphasis of a single frequency and its harmonics. Carrier frequencies differ between species and even within the same genus. High audio and ultrasonic frequencies predominate. Four species have a suppressed fundamental carrier frequency accompanying a dominant second harmonic. One species frequency modulates during its pulse. Calls are remarkably brief and given infrequently, apparently as an adaptation to reduce song exploitation by bat predators. Pseudophylline ear morphology is distinctive. Sound reaches the rear of the tympana via a small spiracle, a small barrel-shaped vesicle, and an acoustic leg trachea of uniform diameter. In front it gains access through relatively large tympanal cavities. In the absence of the horn-shaped acoustic trachea typical of conocephalines and phaneropterines, pressure gradient mechanisms of localization may operate at the tympanal organ. The prominence of particular wavelengths in the songs may be explained as a way to match the resonant frequencies of cavities found in the acoustic tracheal system.

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