Cardiodactylus muiri

Groups of singing males (three or more) distant by ca. 50 cm to one meter, are commonly found during afternoon on large tree trunks above three meters high (Fig. 2). They sit on the bark surface and sometimes in crevices of the bark or of epiphytes. Songs were not heard during night, even when habitats with singing males heard during the day were visited after sunset. It could indicate that the species is diurnal or crepuscular and that the formed couples hide at night for mating.

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The calling song of C. muiri (Fig. 4) consists of only one long syllable. The song bouts are rather irregular, which disqualifies them as echemes. At 26 °C (MNHN-EO-ENSIF4405, measurement of 28 syllables) the call duration is 38 ± 11.4 ms (mean ± SD), with a period of 4.78 s ± 3.83 s, giving a syllable duty cycle of 8%. The dominant frequency is 11.98 ± 0.24 kHz, which is rather low for the genus and corresponds to the third peak of the frequency spectrum, the two first peaks being little marked. [1]

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