Perlodidae Klapálek, 1909,

Teslenko, Valentina A. & Palatov, Dmitry M., 2019, A new micropterous winter species of Leuctra (Plecoptera: Leuctridae) and little known endemic stoneflies from the Greater Caucasus, Zootaxa 4613 (2), pp. 342-354: 349-352

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Perlodidae Klapálek, 1909


Perlodidae Klapálek, 1909 

Bulgaroperla mirabilis caucasica Zhiltzova 1973 

Material examined. 3♂, 1♀, 1 larva. Russia. Krasnodarky Region , Novorossiysk urban District , Abrau-Dyur- so Distric , Abrau River, 2 km above the Abrau settlement, 155 m above sea level, 44°43.546 N 37°35.498 E, 18.0 4.2018, coll. D. Palatov.GoogleMaps 

Mature larva. The association of the mature larva with the adult was established from preemergent male larva collected with adults. Body length of the male mature larva 14 mm. Preserved specimen brown-yellowish with pale markings and pale legs ( Fig. 24View FIGURES 24–26). Dorsum of head brown with pale pattern ( Figs. 24, 25View FIGURES 24–26); a pale diffuse patch anterior to median ocellus; lateral frontoclypeal corners brown ( Fig. 25View FIGURES 24–26); thin lateral branches of M-line and tentorial callosities are pale. А pale trident-shaped spot arranged in interocellar and epicranial areas, with short neck in the part of transverse setal row across occiput widely interrupted medially. Occiput brown, a thin pale band around each eye ( Figs. 24, 25View FIGURES 24–26). Antennae pale, scape medium brown. Mandible with 6 pointed teeth and a deep cleft between apical and subapical teeth ( Fig. 28View FIGURES 27–31). The upper edge of lower mandibular tooth weakly serrate ( Fig. 29View FIGURES 27–31). Lacinia bidentate, triangular ( Fig. 27View FIGURES 27–31), row of setae along inner edge sparse, discontinuous medially, begins with four thin hairs arranged near apical and subapical teeth, two hairs very long, reach the apex of subapical tooth; two strong marginal setae below subapical tooth; the marginal scattered setae at lacinial base thinner and shorter than beneath the subapical tooth ( Fig. 27View FIGURES 27–31). The length of galea does not exceed the length of the three basal palpus segments ( Fig. 27View FIGURES 27–31), with thin short setae along outer edge. Setal fringe along inner edge of galea consists of 7 thin hairs in basal half, and longer than on inner margin of lacinia ( Fig. 27View FIGURES 27–31).

Pronotum oval with rounded corners, 1.8Χ as long, brown with dark brown posterior and anterior pronotal margins mesally, lateral margins with pale band; median pronotal line and spots forming a X–shaped pale pattern diffused medially ( Figs 24, 25View FIGURES 24–26). Meso- and metanota with pale median line and complex color pattern ( Fig. 24View FIGURES 24–26). Abdominal terga pale, each tergum with one median and two lateral pale spots surrounded with dark brown patches, forming longitudinal rows ( Fig. 26View FIGURES 24–26). Paraprocts and cerci pale; paraprocts blunt ( Fig. 30View FIGURES 27–31). Ventral surface of abdomen pale. On mesosternum, branches of Y—ridge meet posterior corners of furcal pits. Only first 2 abdominal segments divided into terga and sterna, others ring-shaped.

Setation. Fine black pilosity (or clothing hairs) appressed to body surface closely and cover mainly pronotum and legs ( Fig. 24View FIGURES 24–26). Transverse setal row across occiput medially widely interrupted, plurilinear setation presents only behind eyes, medially turning into an irregular single row ending far from middle ( Fig. 25View FIGURES 24–26). Marginal setae on pronotum and abdominal terga relatively short, inconspicuous. Setal fringe around pronotum relatively regular and sparse, a few bristles on posterior pronotal corners much longer than on anterior ones, length of the longest bristles at the posterior pronotal corners attains 3.2% of pronotal width ( Fig. 25View FIGURES 24–26). Dark pigmented spots with short setae seen on all abdominal terga ( Fig. 26View FIGURES 24–26). Swimming hairs on the legs present ( Fig. 24View FIGURES 24–26). Apical whorl of cercal segments basally and in the middle part contains short bristles; dorsal fringe of fine hairs lacking ( Figs. 30, 31View FIGURES 27–31). Apical whorl of cerci in apical half packed with tenuous dorsal fringe of scattered silky hairs, length of hairs not exceeding length of the corresponding segment ( Fig. 31View FIGURES 27–31). Additionally, the apical whorl in apical half of cerci bears one long dorsal and ventral setae ( Fig. 31View FIGURES 27–31).

Remark. The West Palaearctic genus Bulgaroperla Raušer 1966  includes a single species B. mirabilis Raušer, 1966  with three subspecies B. mirabilis mirabilis Raušer, 1966  , B. mirabilis nigrita Zwick, 1978  , and B. mirabilis caucasica  . The adults and larvae of these subspecies differ in body size and color patterns (Braash & Joost 1971, Zhiltzova 1973, Zwick 1978). Bulgaroperla mirabilis caucasica  can be distinguished by the smaller body size and lighter color pattern from the other two recognized subspecies.

Distribution. Endemic of the Western Caucasus, occurs in lowland streams (900–1000 m), adults emerge in May—beginning of June.












Perlodidae Klapálek, 1909

Teslenko, Valentina A. & Palatov, Dmitry M. 2019

Bulgaroperla mirabilis caucasica

Zhiltzova 1973