Bioacoustics of Eneoptera guyanensis

Redescription. See Robillard & Desutter-Grandcolas, 2005 . Calling song. ( Fig. 4C , Table 1 ) The call of E. guyanensis shows unique acoustic features: it consists of a complex continuous trill alternating sections of call made of two types of syllables having different spectral properties (only high frequency and broadband vs. narrow band syllable with two codominant frequency peaks at low and ultrasonic frequencies). The alternating sections are also coupled with a strong amplitude modulation generated by a modified stridulatory file and complex calling behavior (for details, see Robillard & Desutter-Grandcolas, 2011 ; Robillard et al. , 2015 ). Sound-production mechanism. ( Fig. 11C , Table 2 ) See Robillard & Desutter-Grandcolas (2011) and Robillard et al. (2015) .

Differential diagnosis. Eneoptera guyanensis is close to E. nigripedis ; both species share a similar morphology and general coloration, dark brown to nearly black, with little contrast between the dark brown dorsum and the rest of body, black, while there is a clear contrast in E. surinamensis and E. caliginosa . Both species also resemble each other for the presence of double teeth in male stridulatory file ( Robillard et al. , 2015 ). They also share the same shiny dark FWs in both sexes, while FWs are dull brown in E. surinamensis and E. caliginosa . E. guyanensis differs from E. nigripedis by possessing (in most of the cases, but some exceptions exist), a characteristic wide orange band on the dorsal part of FIII. E. guyanensis and E. nigripedis ( Figs 8 , 9C–D ) can mostly be distinguished by their male (shape of pseudepiphallus and endophallus) and female genitalia.