Bioacoustics of Isophya rectipennis

Morphological description : see the references above; Brunner von Wattenwyl 1882; Bey-Bienko 1954; Harz 1969; Ünal 2003; Chobanov 2009b. Bioacoustics : Chobanov 2009b. Karyotype : Warchałowska-Śliwa et al. 2008. Supplement to the description : The species is morphologically well defined in the cited sources. The body size as well as some morphological features may vary significantly, especially within the Anatolian population. The stridulatory file ( Fig. 132 A) is short ( 1.5–2.2 mm ), with 45–60 well-detached teeth. The female stridulatory apparatus is shown in Fig. 132 D. The song ( Fig. 136 ) consists of phrases of 2– 4.5 s (mean 2.9±0.8; n=9; Т=26- 28°С), having 22–38 syllables (mean 27±5; n=9). The syllables last 13–47 ms (mean 32±8; n=125) and have 4–17 impulses (mean 14±2; n=65) (counting the number of impulses was not always possible due to their density in the syllable). The syllables period varies from 66 to 312 ms (mean 100±39; median 85; n=122). On the basis of the length of the syllable period the phrase may be separated into two parts: (1) first part having larger number of syllables (15–25) with a period of 70–90 ms (sometimes up to 120 ms between the first syllables) and (2) second part with fewer syllables (5–10), which period increases from beginning to the end of the part from about 100 to above 300 ms. The boundary between the two parts may be placed at the transition of 90–100 ms syllable period. Indications on Fig. 32 show, respectively: CuA and CuP—position of CuA and CuP veins; S—lateral dark stripe of pronotum. Abbreviations of depositories: see Material and methods. Scale (if present; black line right of the specimen) = 10 mm .

Distribution ( Fig. 191 ) and phenology : The species’ range stretches from the Pontic region of Northwestern Anatolia through European Turkey , Southeastern, Central and Northern Bulgaria (very locally in NE Greece ), to Southeastern Romania (Dobrogea and Wallachia, up to the Subcarpathians at Buzäu, thus penetrating outside the borders of the Balkan Peninsula). An introduced population of this species was recently discovered in France , Departement Bouches-du-Rhône, around the city of Aix-en Provence in June 2009 (Yoan Braud, Christian Roesti et Eric Sardet, personal communication documented with photos and song recordings). I. rectipennis prefers meso- and xeromesophyte grass habitats in hilly and mountain terrains, occurring from the sea level to 1200 m in the Balkans and to 2200 m in Anatolia . Nymphs—III–V(–VI), imago—V(VI)–VII(–XI). Notes to the literature distribution data : The records for “ I. pyrenaea ( camptoxypha ) ” from Bulgaria by Nedelkov (1908) concern either I. rectipennis or I. speciosa (see Chobanov 2009b and Appedix: List of localities).