Bioacoustics of Chlorocoelus hypericifolius

B Bioacoustics Stridulatory organs. The stridulatory file (length 5.5 mm ) in the underside of the left tegmen consists of ca. 51 teeth whose intervals continuously decrease from tegmen edge towards articulation (tooth intervals ca. 150 to 100 µm; extreme 227 µm to 50 µm; Fig. 3 ). A few very small teeth near the articulation were not included. The mirror cell of this left tegmen is neither glossy nor thin nor transparent but looks quite robust ( Fig. 1 , Fig. 2 ). In contrast, the mirror of the right tegmen is semi-transparent, but does not look to be very thin or glossy (width 5.2 mm x length 4.0 mm; Fig. 2 ). Sounds. In the video recordings single syllables and several series of disturbance sounds can be heard, produced as reaction to touching the animal. A series contains of several (5–18; mean 12.4; n=5) short syllables with a mean duration (closing hemisyllable) of 35.4±5.3 ms (n=20). Each hemisyllable consists of one narrow-banded sound pulse with a carrier frequency of about 2.1 kHz ( Fig. 4 ). Accordingly the syllables have high quality values (in the second part of a series Q 3dB > 50, Q 10dB > 33). On average, about 74 maxima of the sound wave can be calculated per syllable. The first syllable of a series sometimes has an irregular structure possibly as an effect of the touching.

Identification. Chlorocoelus hypericifolius is characterized by its large, inflated tegmina ( Fig. 1 ). However, within Pteropyllini there are a few relatively similar genera all with a large number of parallel veins in the costal area ( Beier 1960 ). Chlorocoelus and Phyllopectis Rehn differ from the others ( Lea Caudell, 1906 , Paracyrtophyllus Caudell, 1906 and Pterophylla , all from North America) by the short male subgenital plate, simple cerci and (as far as data are available in OSF ) glossy mirrors in both tegmina as exemplified in Fig. 2D, E ). C. tanana and P. crepitans ( Redtenbacher, 1892 ) have been combined under Chlorocoelus until Rehn (1948) erected Phyllopectis . One important discriminative character is based on the structure of the stridulatory area in the left male tegmen, which is bi-partite in Phyllopectis and carries a distinct mirror ( Fig. 2C ) whereas it is strongly sclerotized in Chlorocoelus with a only weakly recognizable mirror (see Fig. 2A, B ).