Omocestus (Dirshius) petraeus (Brisout de Barneville, 1855)

Şirin, Deniz, Mol, Abbas, Taylan, Mehmet Saýt, Demýr, Eyüp & Kizilocak, Dýlan Hevra, 2017, The Gomphocerinae Tarbinsky, 1932 (Orthoptera: Acrididae) fauna of the Turkish Thrace, Zootaxa 4299 (3), pp. 361-383 : 369-370

Omocestus (Dirshius) petraeus (Brisout de Barneville, 1855)

Acridium petraeum Brisout de Barneville, 1855: 3 (3):114.

Distribution in the Palaearctic region: Western Europe, Caucasia, Kazakhstan, Southern side of European part of Russia, Southern Siberia, Syria, Turkey and Greece ( Bei-Bienko & Mistshenko 1951; Willemse 1985; Mol & Zeybekoğlu 2013).

Distribution in the Turkish Thrace: First record for the study area.

Material examined: KIRKLARELİ: Kırklareli-Kofçaz road, 514m a.s.l., N: 41°54.430’ E: 27°10.714’, 31.VII.2013, 4 ♂♂, 1 ♀, leg.: D. Şirin & E. Bayram (Calling song recorded from two males at 27 ˚C in the field by D. Şirin); Kofçaz, Kofçaz exit, 604m a.s.l., N: 41°57.683’ E: 27°09.348, 31.VII.2013, 4 ♂♂, 3 ♀♀, leg.: D. Şirin & E. Bayram ( Fig. 9 A).

Description of song: Omocestus petraeus male calling song generally consists of a polysyllabic phrase ( Fig. 9 B). The calling song lasts mostly for 2–4 s. Syllable numbers vary from 7 to 10 in a phrase ( Fig. 9 C). The duration of syllables changes between 220 and 360 ms ( Fig. 9 D).

Published song data, used for comparison: Ragge & Reynolds 1998; Tishechkin & Bukhvalova 2009.

Figures

FIGURE 9. The distribution of Omocestus (Dirshius) petraeus populations in Turkish Thrace Region (A) and male calling song oscillograms at three different time scales (B, C and D).