Sericostoma grusiense Martynov 1913

Sipahiler, Füsun, 2021, Males of the genus Sericostoma Latreille 1825 in Turkey (Trichoptera Sericostomatidae), Zootaxa 4965 (3), pp. 483-500: 487-488

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Sericostoma grusiense Martynov 1913


Sericostoma grusiense Martynov 1913  

( Figs 11–15 View FIGS )

Material examined. Turkey, Giresun, Egridin Pass , 1450 m, 40°23´N, 38º25´E, 4–5.vii.1996, 9 males, 5 females, leg. Guerguiev, coll. SİPAHİLER, (CD: U-132); GoogleMaps   Kümbet Yaylası-Yağlıdere direction, Çıkrıkkapı, 1786 m, 10.vii.2008, 40°32´N, 38°30´E, 1 male, (CD: U-151); GoogleMaps   Şebinkarahisar, Eğribel Pass, 2000 m, 40º28´N, 38º23´E, 9.vii.2008, 1 male, 3 females, (CD: U-155); GoogleMaps   Bektaş yaylası direction, before Kulakkaya yaylası, 1530 m, 40°41´N, 38°21´E, 9.vii.2008, 1 male, (CD: U-156) GoogleMaps   ; Rize, Sivrikaya Village, 1865 m, 40º40´N, 40º42´E, 9.vii.1984, 5 males, 8 females; GoogleMaps   Çamlıhemşin, Çat, Fırtına Stream, 1500 m, 40º51´N, 40º56´E, 15.vii.1984, 1 male, 28 females, (CD: U-26); GoogleMaps   Ayder, Kaler, 1900 m, 40º56´N, 41º07´E, 17.vii.1984, 1 male, 1 female, (CD: U-27); GoogleMaps   İkizdere, Anzer, 2200 m, 40º36´N, 40º32´E, 20.vii.1984, 1 male, 3 females, (CD: U-32); GoogleMaps   İkizdere, (light), 460 m, 18.vii.1984, 1 male, 1 female, (CD: U-38); GoogleMaps   Çorum-Sinop province border, Kargı, Pelit Yaylası, 1500 m, 41°11’N, 34°20’E, 11.vii.2009, 1 male pupa, (CD: U-165) GoogleMaps   ; Artvin, Yusufeli, Barhal Stream , (light), 600 m, 40º48´N, 41°32’E, 21.vii.2004, 1 male, 1 female (CD: U-136); all leg. and coll. SİPAHİLER GoogleMaps   .

General description. Antennae, maxillary palps, and wings are dark brown, wings pale brown and spotted, head and thorax dorsally dark brown to black; legs yellowish; maxillary palps of male large ( Fig. 11 View FIGS ); length of each male forewing 10.0–12.0 mm (mean = 11.02 mm, n = 10), of each female forewing 13.0–13.5 mm (mean = 12.1 mm, n = 5).

Description of male genitalia ( Figs 12–15 View FIGS ): In lateral view, segment IX dilated, nearly triangular on each side, anterolateral apex at 80° angle. Preanal appendages rather broadly oval. In lateral view, basoventral branch of each lateral prolongation of segment X longer and wider than mesoventral branch, its anterior subapical margin convex; mesoventral branch short, acute, positioned at right angle to prolongation and directed lateroventrad; dorsal branch dilated subdistally, apically triangular, acute, curved posteroventrad; in dorsal view, subdistal portion with small, pointed projection on inner edge before abruptly diverging laterad. In ventral view, ventral branches of inferior appendages rather dilated at tips, roundly oval. In lateral view, phallic apparatus having apical portion slightly thicker than basal portion, with basoventral carina triangular and longer than thickness of base.

Diagnosis: The male of this species resembles Sericostoma flavicorne   . The main differences are seen in the shape of lateral prolongations of segment X: In S. grusiense   the basoventral projections of the lateral prolongations are larger, the mesoventral projections are vertically located and directed ventrad, and the dorsal projections have a corner on the inner edges of the subdistal parts and their apices are directed posterolaterad, whereas in S. flavicorne   the basoventral projections are smaller and the mesoventral and the dorsal projections are directed posteroventrad ( SİPAHİLER 2000). It also resembles S. ida   by having its ventromesal projections on the lateral prolongations of segment X directed ventrad, but in S. ida   the ventromesal projections are quadrangular.

Remarks. Sericostoma grusiense   occurs in Georgia, the Russian Caucasus, and northern Turkey. The habitat of this species is mountain streams with rapidly flowing water.