Euchorthippus declivus (Brisout de Barneville, 1848)

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 : 371

Euchorthippus declivus (Brisout de Barneville, 1848)

Acridium declivus Brisout de Barneville, 1848: 2 (6), 420.

Distribution in the Palaearctic region: South Western and Eastern Europe, Balkans, Turkey ( 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, 14 ♂♂, 11 ♀♀, leg.: D. Şirin & E. Bayram ( Fig. 11 A). Calling song recorded from two males at 27 ˚C in the laboratory conditions by D. Şirin.

Description of song: Euchorthippus declivus male calling songs usually consist of equally spaced polysyllabic phrases ( Fig. 11 B). The calling song durations vary from 15 s to 2 min, depending on the number of phrases. Syllable numbers change from 5 to 7 in a phrase ( Fig. 11 C). The duration of syllables changes between 60–74 ms ( Fig. 11 D). A syllable comprises two different parts. Part A contains a long pulse (lower amplitude) and Part B includes 3–5 short pulses (higher amplitude), where the last pulse of Part A is the loudest one ( Fig. 11 D)

Published song data, used for comparison: Ragge & Reynolds 1998.

Figures

FIGURE 11. The distribution of Euchorthippus declivus populations in Turkish Thrace Region (A) and male calling song oscillograms at three different time scales (B, C and D).