Triogma trisulcata (Schummel, 1829)

Kolcsar, Levente-Peter, Paramonov, Nikolai, Imada, Yume, Kato, Daichi, Gamboa, Maribet, Shinoka, Dai, Kato, Makoto & Watanabe, Kozo, 2022, Notes on the taxonomic status and distribution of some Cylindrotomidae (Diptera, Tipuloidea), with emphasis on Japanese species, ZooKeys 1083, pp. 13-88 : 13

Triogma trisulcata (Schummel, 1829)

Figs 39 , 40

Triogma pulla (Meigen, 1830)

Non-type material examined.

Russia • 1 ♂, 1 ♀; Leningrad Oblast, Luzhsky District, around Luga City; 58.74°N, 29.85°E; alt. 40 m; 5 Jun. 1954; A.A. Stackelberg leg.; CKLP. United Kingdom • 2 ♂; Birmingham, Sutton Park, Longmoor Valley; 52.5635°N, 1.8633° W; alt. 125 m; 30 Apr. 2019; P. Boardman leg.; CKLP.

Supplementary description.

Male terminalia. Directed caudally. Tergite 9 fused with gonocoxites at base (Fig. 39C ). Tergite 9 lateral parts weakly produced, triangular (Fig. 39A, C ); posterior margin bent back under tergite 9, forming W-shaped plate (Fig. 39A ). Sternite 9 fully membranous (Fig. 39B ). Gonocoxite large ~ 1.5-1.6 × longer than tergite 9, without evident ventral or apical lobe (Fig. 39B, C ); inner surface hairy. Gonostylus simple, narrowing to end (Fig. 39A, C ). Aedeagus complex 1.4 × longer than gonocoxite (Fig. 39C ); ejaculatory apodeme medium size, not covered by paramere in lateral view (Fig. 39F ); interbase weakly curve dorsally, with small notch at tip in lateral view (Fig. 39F ); dorsal lobe between interbases, membranous, bubble-like; sperm ducts branching from elongation of sperm pump, branching area darker (Fig. 39E, F ); aedeagus trifid, as wide as interbase at mid-length in lateral view, aedeagus directed ventrally, just tip turning back dorsally (Fig. 39F ); medial branch shorter than lateral branches (Fig. 39D-F ).

Female terminalia: Tergite 8, ~ 2 × wider than tergite 9 in lateral view (Fig. 40B ); not divided medially, posterior part partly membranous with a few hairs (Fig. 40A ). Tergite 9 rectangular in lateral view (Fig. 40B ). Triangular of tergite 10 large, fused with tergite 10 (Fig. 40A ). Cercus simple, with distinct rugged area at tip; formed by short pyramid teeth (Fig. 40A, B ); ventral margin with small, rounded notch at 1/3 of length. Hypogynial valve long, blade-like, shorter than cercus; with transverse ditch at base, holding lateral lobes of male tergite 9 during copulation (Fig. 40B ). Common spermathecal duct short; spermathecal ducts carrot-shaped, without clear pattern; suddenly narrow (Fig. 40C ); three spermathecae large, irregularly spherical, with comparably long and curved duct (Fig. 40D ).

Distribution.

Palearctic species, with a wide distribution range in Europe, except the southern parts. Previously reported from Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Great Britain, Hungary, Italy, Latvia, Lithuania, Netherlands, Norway, Poland, Romania, Russia (North and Central European Russia), Slovakia, Sweden, and Switzerland. It was reported from Eastern Palearctic, but so far only from East Siberia (Irkutsk Oblast), Russia ( Oosterbroek 2021).

Figures

Figure 39. Male genital structures of Triogma trisulcata (Schummel, 1829) A terminalia, dorsal view B terminalia, ventral view C terminalia, lateral view D aedeagus complex, dorsal view E aedeagus complex, ventral view F aedeagus complex, lateral view.

Figure 40. Female genital structures of Triogma trisulcata (Schummel, 1829) A terminalia, dorsal view B terminalia, lateral view C sternite 8, hypogynial valve, and sperm ducts, inner dorsal view D spermathecae.