Stridulatory rile and calling song of two populations of the tropical bush cricket Eneoptera surinamensis (Orthoptera, Gryllidae, Eneopterinae)

This study characterizes the calling song and ultramorphology of the stridulatory file of two geographically isolated populations of the tropical bush cricket Eneoptera surinamensis (De Geer, 1773) from city of Foz do Iguacu, state of Parana, and town of Rio Claro, state of Sao Paulo, Brazil, distant 1,000 Km from each other. The teeth are shell-shaped, the larger ones are distributed in the medium region of the file, decreasing gradually in size towards the edges. Specimens from Foz do Iguacu have a file with 82 +/- 9.8 teeth, length=1.89 mm +/- 0.15 with 43.76 +/- 5.94 teeth per mm (n=15). Specimens from Rio Claro present a file with 87 +/- 9.81, length=1.96 +/- 0.19 mm with 44.52 +/- 4.61 teeth per turn (n=15). Statistical differences found between the two populations are not significant. The calling song is an uninterrupted trill that alternates two sets of notes distinct for its temporal features.