Sericostoma mesopotamicum McLachlan 1898

Sipahiler, Füsun, 2021, Males of the genus Sericostoma Latreille 1825 in Turkey (Trichoptera Sericostomatidae), Zootaxa 4965 (3), pp. 483-500 : 488-491

Sericostoma mesopotamicum McLachlan 1898

( Figs 16–20 )

Material examined. Turkey, Hakkari, Otluca , 2074 m, 37º36´N, 43º41´E, 18.vii.1980, 4 males, 1 female, leg. Demirsoy, coll. SİPAHİLER, (CD: U-11) ; Kayseri, Pınarbaşı, Sarız, Elbistan direction, Büyük Gümüşgün Village , 1400 m, 38º43´N, 36º24´E, 16.vi.2008, 2 males, 6 females, (CD: U-150); Tufanbeyli, Develi direction, Dereşimli Village , 1420 m, 38º12´N, 35º54´E, 20.vi.2008, 4 males, 2 females, (CD: U-171); Sarız, Elbistan direction, 1550 m, 17.vi.2008, 38º27´N, 36º28´E, 1 male, (CD: U-172) ; Erzincan, 30 km East, Girlevik, Çağlayan Village , 1050 m, 39º35´N, 39º43´E, 12.vii.2008, 3 males, 2 females (CD: U-162) ; Tunceli, 10 km W Ovacık, Koyungülü Village , 2067 m, 39º23´N, 39º06´E, 22.vii.1983, 2 males, 1 female, (CD: U-18) , Konya, Akşehir, Saray Village, Yalvaç direction, Sultan Mountains , Yellibel , 1500 m, 38º21´N, 32º27´E, 11.vi.1994, 13 males, 2 females (CD: U-88); same place, waterfall, 11.vi.1994, 38º21´N, 32º27´E, 5 males, 1 female, CD: U-89; same place, 1800 m, 38º20´N, 31º17´E, 12.vi.1994, 4 males, 1 female, (CD: U-94); all leg. and coll. SİPAHİLER .

General description. Antennae, maxillary palps, and wings dark brown, sclerotized parts of head and thorax black, maxillary palps broad especially on dorsal parts ( Fig. 16 ). Length of each male forewing 10.0–12.0 mm (mean = 11.1 mm, n = 5), of each female forewing 12.0–13.0 mm (mean = 12.8 mm, n = 6).

Description of male genitalia ( Figures 17–20 ): In lateral view, segment IX moderately dilated on sides, anterolateral margins rounded with 70° angle; in ventral view median part rather broad, apically rounded. Lateral prolongations of segment X each with basoventral branch short, directed ventrad, apically acute; mesoventral branch 1/3 as long as dorsal branch, directed caudad, with acute apex slightly curved ventrad; dorsal branch long, distal portion somewhat curved dorsad. In dorsal view, mesoventral and dorsal branches straight, parallel, dorsal branches without small, pointed projections on inner edges, directed caudad. In ventral view, ventral branches of inferior appendages long and rather slender, apically slightly thicker and curved mesad, pointed. In lateral view, phallic apparatus having apical portion twice as thick as basal portion, with basoventral carina triangular and longer than thickness of base.

Diagnosis: Sericostoma mesopotamicum resembles S. flavicorne . The differences between these two species are given with the description of S. flavicorne above.

Remarks. Sericostoma mesopotamicum was described by McLachlan based on a specimen collected from Malatya in eastern Turkey. He noted that it has a very distinct form and he gave a figure of the lateral prolongations of segment X (as “penis sheaths”), which shows the disproportional lengths of the branches; the mesoventral branch is only 1/3 as long as the dorsal branch ( McLachlan 1898). This species was considered a synonym of S. flavicorne by SİPAHİLER & Malicky (1987) and the specimens were listed as that species; later, after more material was collected and examined, it was included in the list of valid species ( SİPAHİLER 2005). Sericostoma mesopotamicum occurs in eastern and southeastern Anatolia. It lives in rapid flowing streams.

Figures

FIGS. 16-20. Sericostoma mesopotamicum McLachlan 1898, male: 16, head and right maxillary palp, right lateral. 17–19, male genitalia: 17, left lateral; 18, dorsal; 19, ventral. 20, phallic apparatus, left lateral. Abbreviations: bb = basoventral branch of lateral prolongation of segment X; bc = basoventral carina; db = dorsal branch of lateral prolongation of segment X (paired); dbi = dorsal branch of inferior appendage (paired); dl = dorsal lobe of dorsal branch of inferior appendage (paired); lp = lateral prolongation of segment X (paired); mb = mesoventral branch of lateral prolongation of segment X (paired); mp = maxillary palp (paired); pa = preanal appendage (paired); sıx = segment IX; sx = segment X; vb = ventral branch of inferior appendage (paired).