Hexacentrus Serville, 1831

Morris, Glenn K, Ingrisch, Sigfrid, Willemse, Fer, Willemse, Luc, De Luca, Paul A. & Klimas, Dita, 2025, Stridulation songs of some Tettigoniidae (Ensifera, Orthoptera) from Papua New Guinea, Zootaxa 5600 (1), pp. 1-81 : 71

Hexacentrus Serville, 1831

( Fig. 77 )

Type-species: Hexacentrus unicolor Serville, 1831 (by monotypy).

More than 20 taxa are assigned to this genus. The systematic position of several of them is not clear, mainly by absence of reliable specific characters. It transpired however, that morphological particulars of the male stridulatory file offer uncommonly good means for identification. It might be expected that bioacoustics will do the same. We compared the files in H. dorsatus , H. pusillus , H. australis (all Redtenbacher 1891), H. fuscipes Matsumura & Shiraki 1908 , H. japonicus Karny 1907 , H. karnyi Griffini 1909 , H. borneensis C. Willemse 1961 and a small yet undescribed species from eastern New Guinea with those in H. unicolor and H. mundus . All of them are quite characteristic and recognizable immediately.

Two males before us from the surroundings of Wau, Morobe District , NE New Guinea may easily be arranged under what hitherto has been understood to represent H. mundus (Walker, 1869) .

Figures

FIGURE 77. Hexacentrus mundus acoustic analysis: A) part of a calling bout, initiated by a single transient pulse, followed by high-rate repetition of multiple short sound bursts at a stable period; B) complex wavetrain of starting pulse; C) spectrum of this onset pulse; D) 5 sound bursts excerpted from sustained song in A, little or no indication in waveform of tooth events; E) spectrum of time sample in D, insect’s most intense output in middle audio range.