Isophya bureschi Peshev, 1959

Dragan P. Chobanov, Beata Grzywacz, Ionuţ Ş. Iorgu, Battal Cιplak, Maya B. Ilieva & Elżbieta Warchałowska-Śliwa, 2013, Review of the Balkan Isophya (Orthoptera: Phaneropteridae) with particular emphasis on the Isophya modesta group and remarks on the systematics of the genus based on morphological and acoustic data, Zootaxa 3658 (1), pp. 1-81 : 19-22

3.1. Basal species: Isophya bureschi Peshev, 1959

( Figs 8, 9 , 35, 60 , 84 , 109 , 139 , 145 , 192 )

Isophya bureschi Peshev : Peshev 1959b (sp.n.).

Morphological description: Peshev 1959b. Karyotype: Warchałowska-Śliwa et al. 2008.

Supplement to the description and a diagnosis: The species shows most primitive features within the group, similar to these of I. cania of the I. rectipennis group. Generally these are expressed in medium body size, more gracile than the other species of I. modesta group, and a very short main (first) part of the syllables of male song. The body colouration is fresh-green. The tegmina are not bulged, equal or slightly longer than the pronotum, green with brownish stridulatory area. The CuP vein is greenish, thin and short (≤2/3 of the width of metazone), clearly separated from CuA. The stridulatory file ( Fig. 139 A) bears low number (68–75) of sparsely arranged teeth. The ventral keels of hind femora are unarmed or have a single tooth each. The cercal tooth ( Fig. 139 B) is long, pointed. Female stridulatory apparatus is shown in Fig. 139 C. Male calling song ( Fig. 145 ) consists of groups of few syllables, each having short main (first) part (30–60 ms) with dense impulses and a second part of few wellseparated impulses (after-clicks). Both parts are separated by a silent interval (due to a pause in the stridulatory movement) and thus the syllable becomes 0.5–1 s.

Bioacoustics: The two investigated populations (from North Pirin Mts—Yundola village, and Sushtinska Sredna Gora Mts—Oborishte place) showed slight variation in the song. At a temperature between 25 and 28°С the song consisted of groups of 2–4 (usually 3) or single syllables. Within the group the syllables were separated by an interval of 0.7–3 s, which duration varied even within the same group and was dependent on the presence or absence of additional impulses (after-clicks) in the syllables. The syllables (main part) were frequently followed by additional part of few after-clicks that was usually missing in the first syllable of the syllable group. The main syllable part lasts 28–48 ms (mean 38±6; n=51) (Т=26–28°С) and consists of 12–25 detectable impulses (mean 19±4; n=46). In the available recordings the main part was “continued” by a low-amplitude echo (see Chobanov and Heller 2010). The additional syllable part (if present) follows after over 500 ms and results from by a delayed closing movement of tegmina producing 2–13 clearly detached impulses. Together with the after-clicks the syllable lasts between 0.5 and 1 s (mean 725±70; n=43).

Distribution ( Fig. 192 ) and phenology: The species’ range covers the northwestern part of the Rila-Rhodope Massive and few geographically connected mountains (Vitosha, Plana, the western half of Sredna Gora Mts) in Central and Southwestern Bulgaria. Contrary to the distribution of the other species of the group I. bureschi was found only in mountain ranges above 700 m, which may explaine its relict character. It inhabits mesophyte grass and grass-bush associations in the mountain belt between 700–800 and 2000 m alt. Nymphs—(III–)IV–VI(–VII), imago—(V–)VI–IX(–IX).

Notes to the literature distribution data: The records for I. modesta from Bulgaria by Nedelkov (1908: Rodopi, Vitosha, Sredna Gora) are referred to I. bureschi undescribed at that time.

Figures

FIGURE 192. Distribution of I. bureschi, I. andreevae, I. tosevski, I. clara, I. miksici, I. plevnensis, I. longicaudata adamovici, I. l. longicaudata, and I. modesta on the Balkan Peninsula.

FIGURES 1 – 18. General appearance of some Balkan Isophya. 1, 2 — I. hospodar (1 — male, 2 — female); 3 — I. thracica (male); 4, 5 — I. rectipennis (4 — male, 5 — female); 6, 7 — I. pavelii (6 — male, 7 — female); 8, 9 — I. bureschi (8 — male, 9 — female); 10, 11 — I. andreevae (10 — male, 11 — female); 12, 13 — I. plevnensis (12 — male, 13 — female); 14, 15 — I. m. modesta (= intermedia) (14 — male, 15 — female); 16 — I. l. longicaudata (male); 17 — I. rhodopensis leonorae (male); 18 — I. rh. petkovi (male) (Figures 6 – 11, 17, 18 — photo M. Langourov).

FIGURES 56 – 79. Morphology of female head, pronotum and tegmina of the Balkan Isophya and I. yaraligozi (localities as in Figs 31 – 55 unless specifically given): 56 — I. hospodar; 57 — I. rectipennis; 58 — I. pavelii (paratype of I. rammei Peshev); 59 — I. thracica; 60 — I. bureschi; 61 — I. yaraligozi; 62 — I. tosevski; 63 — I. andreevae (paratype); 64 — I. clara; 65 — I. miksici (paratype); 66 — I. plevnensis (paratype); 67 — I. longicaudata adamovici (paratype, BG: Sliven, 1000 m, NMNHS); 68 — I. l. longicaudata; 69 — I. rhodopensis leonorae (BG: “ Alibotush, 1500 m ”, 13.07. 1959, NMNHS); 70 — I. rh. rhodopensis (as in Fig. 46 but 17.07.1956); 71 — I. rh. petkovi; 72 — I. modestior; 73 — I. dobrogensis; 74 — I. zubowskii; 75 — I. aff. camptoxypha (MK: Bistra Mt., 2.08. 2004, CC); 76 — I. gulae (paratype, BG: Dolna Topchiya, 10.07. 1974, NMNHS); 77 — I. obtusa (BG: Vezhen Peak, 15.07. 1969, NMNHS); 78 — I. amplipennis (TR: “ Turkey | 1960 | Sureya Bey ”, NHM); 79 — I. speciosa (BG: Sakar Mt., 14.06. 1952, NMNHS). Scale (if present; black line right of the specimen) = 10 mm.

FIGURES 80 – 104. Male abdominal terminalia of the Balkan Isophya and I. yaraligozi (localities as in Figs 31 – 55): 80 — I. hospodar; 81 — I. rectipennis; 82 — I. pavelii; 83 — I. thracica; 84 — I. bureschi; 85 — I. yaraligozi; 86 — I. tosevski; 87 — I. andreevae; 88 — I. clara; 89 — I. miksici; 90 — I. plevnensis; 91 — I. longicaudata adamovici; 92 — I. l. longicaudata; 93 — I. m. modesta (= intermedia); 94 — I. rhodopensis leonorae; 95 — I. rh. rhodopensis; 96 — I. rh. petkovi; 97 — I. modestior; 98 — I. dobrogensis; 99 — I. zubowskii; 100 — I. aff. camptoxypha; 101 — I. gulae; 102 — I. obtusa; 103 — I. amplipennis; 104 — I. speciosa. Scale (if present) = 2 mm.

FIGURES 105 – 129. Female abdominal terminalia of the Balkan Isophya and I. yaraligozi (localities as in Figs 31 – 55 unless specifically given); figures of the whole ovipositor are followed by enlarged figure of the ovipositor base: 105 — I. hospodar (BG: Dolni Glavanak, 25.04. 2005, CC); 106 — I. rectipennis (BG: Byala Vill., 27.06. 2002, CC); 107 — I. pavelii (BG: Chernogorovo, 29.05. 2006, CC); 108 — I. thracica; 109 — I. bureschi (BG: Bansko, 8.08. 2006, CC); 110 — I. yaraligozi; 111 — I. tosevski; 112 — I. andreevae (BG: Kresnensko Hanche, 19.04. 2006, CC); 113 — I. clara; 114 — I. miksici (BG: Gorski Dom Lodge, 24.06. 2006, CC); 115 — I. plevnensis (BG: Levishte, 14.07. 2009, CC); 116 — I. longicaudata adamovici (BG: Karandila, 24.06. 2008, CC); 117 — I. l. longicaudata (BG: Sofia University Botanical garden, 26.06. – 1.07.2004, CC); 118 — I. m. modesta (= intermedia); 119 — I. rhodopensis leonorae (BG: Livade, 9.08. 2006, CC); 120 — I. rh. rhodopensis (BG: Bachkovo, 600 m, 23.05. 2004, CC); 121 — I. rh. petkovi (BG: Gluhite Kamani, 23.06. 2008, CC); 122 — I. modestior (BG: Bankya, 24.05. 2006, CC); 123 — I. dobrogensis; 124 — I. zubowskii; 125 — I. aff. camptoxypha (data as in Fig. 75); 126 — I. gulae; 127 — I. obtusa (BG: Ravnets Ridge, 14.07. 2009, CC); 128 — I. amplipennis (as in Fig. 78); 129 — I. speciosa (BG: Bankya, 24.05. 2006, CC). Indications on Fig. 127 show, respectively: G—gonangulum; L—lamella; P—lateral pit between lamella and gonangulum. Scale (if present) = 5 mm.

FIGURES 139 – 144. SEM of taxonomically important structures of Isophya: 139 — I. bureschi (BG: Pirin Mts, Chalin Valog); 140 — I. yaraligozi (TR: Yaraligoz Mt.); 141 — I. tosevski (MK: Dojran Lake); 142, 143 — I. andreevae (142 — BG: Kresna Gorge; 143 — BG: Eleshnitsa Locality); 144 — I. clara (BA: Sarajevo). A—male stridulatory file (139 — scale 200 μm; othersscale 1 mm); B—ventro-apical view of apex of male cerci (scale 100 μm); C—female stridulatory apparatus (139 — scale 200 μm; 141, 144 — scale 1 mm; 142 — scale 500 μm).

FIGURES 145 – 149. Male calling song at two different speeds (air temperature at recording shown; time scale below): 145 — I. bureschi (BG: Pirin Mts, Chalin Valog); 146 — I. yaraligozi (TR: Yaraligoz Mt.); 147 — I. tosevski (MK: Moklishte Village); 148, 149 — I. andreevae (148 — BG: Eleshnitsa Locality; 149 — BG: Kresna Gorge).