Omocestus haemorrhoidalis (Charpentier, 1825)

Tishechkin, Dmitri Yu., 2017, Contributions to the study of gomphocerine grasshoppers calling songs (Orthoptera: Acrididae: Gomphocerinae) with notes on taxonomic status and distribution of some forms from Kyrgyzstan, Zootaxa 4318 (3), pp. 531-547 : 535

3. Omocestus haemorrhoidalis (Charpentier, 1825)

Figs. 10–12

Distribution. Transpalaearctic.

Locality. 8. Eastern shore of the Issyk-Kul’ (Ysyk Köl) Lake, 20 km West of Mikhailovka Village , dry glades in the thickets of sea buckthorn, 21. VII. 2014. Signals of 1 ♂ recorded on disk at 35o C.

References to song. Ragge & Reynolds (1998): recordings from Western Europe; Savitsky (2005): recordings from the Lower Volga Region and Western Kazakhstan (Janybek, ca. 5 km from the Russia border); Savitsky (2009): recordings from Western Kazakhstan (Janybek, ca. 5 km from the Russia border); Tishechkin & Bukhvalova (2009a): recordings from Saratov Oblast, Eastern Siberia, and Primorskiy Kray; Iorgu & Iorgu (2011): recordings from Romania.

Song. The calling song is a single or regularly repeated echeme lasting about 3–4 s and consisting of syllables following each other with a period of about 35–60 ms in our recordings ( Figs. 10–11 ). Each echeme begins quietly and reaches maximum intensity in the second half or near the end. A syllable repetition period gradually increases towards the end of an echeme ( Tishechkin & Bukhvalova, 2009b, fig. 83). Typically, syllables do not include distinct gaps ( Fig. 12 ).

Comparative notes. O. haemorrhoidalis is one of the most thoroughly studied gomphocerine species; presently, there are signal recordings from many localities in Europe including European Russia, Western Kazakhstan (Janybek, ca. 5 km from the Russia border), Siberia, and the Russian Far East. Throughout many thousands kilometres of its range the song pattern remains remarkably constant both in general structure and in a syllable repetition period ( Tishechkin & Bukhvalova, 2009a, b). Songs of the male from Kyrgyzstan do not differ from these of males from other regions.

Figures

FIGURES 2 – 12. Oscillograms of male calling songs of Gomphocerinae. 2 – 6 ― Dociostaurus maroccanus (Thunb.), 7 – 9 ― Stenobothrus fischeri (Ev.), 10 – 12 ― Omocestus haemorrhoidalis (Charp.). Faster oscillograms of the parts of songs indicated as “ 3 ”, “ 5 – 6 ”, “ 8 – 9 ”, and “ 11 – 12 ” are given under the same numbers.