Stactobiella tshistjakovi (Arefina & Morse 2002)
- Dataset
- The genus Stactobiella Martynov (Trichoptera, Hydroptilidae) in Japan
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Insecta
- order
- Trichoptera
- family
- Hydroptilidae
- genus
- Stactobiella
- species
- Stactobiella tshistjakovi
description
(Figs 1, 6)
description
Male (Figs 1 A – 1 F). Segment IX smaller than segment VIII, with pair of long anterior apodemes. Segment X membranous, subquadrate with pair of heavily sclerotized hook-shaped rods near ventral edges internally. Subgenital plate bar-like, arising from above bases of inferior appendages, directed caudad, subacute apically. Inferior appendages narrowly triangular in ventral view, without any humps or branches, each with 4 long setae near base, curved mesad and with 2 fine setae subapically. Aedeagus divided at basal 3 / 5, semi-membranous at apical 1 / 5, beak-like apically; paramere arising at basal 3 / 5, directed caudad, slightly shorter than aedeagus. Female (Figs 1 G, 1 H). Tergite and sternite of segment VII fused laterally. Segments VIII – X without any surface sclerites. Segment VIII with about 20 marginal setae. Vaginal apparatus long lozenge-shaped in ventral view, mushroom-shaped in lateral view. Specimens examined. Russia, central Sakhalin: 7 males, 12 km from Tymovskoye Town, 6. viii. 2001, B. Martin & N. Minakawa. Japan, Hokkaido: 4 males, 30 females, Horokanai-cho, Shumarinai, Shumarinai-gawa, small tributary, 7. vii – 3. viii. 2016, T. Ito, Malaise trap & light pan trap; 6 males, 33 females, Shibecha-cho, Shirarutoro-etoro-gawa, Tomi-bashi, 25. vii. 2008, T. Ito, light trap; 17 females, same locality, 16. vii. 2009, T. Ito, light trap; 1 male, 5 females, same locality, 28. vii. 2012, T. Ito, light trap; 10 males, 15 females, Shibecha-cho, Shirarutoro-etoro-gawa, 17 m above sea level, 16. vii. 2009, T. Ito, light trap; 1 female, Eniwa-shi, Ichankoppe-zawa, 200 m above sea level, 15. vii. 2000, T. Ito, light trap; 2 males, 2 females, Otaru-shi, Okusawa-suigenchi, 29. vii. 1996, Y. Sasaki & F. Takahashi, (mounted on slide by N. Kuhara; deposited in personal collection of N. Kuhara); 5 males, Kuromatsunai-cho, Utasai-gawa, tributary, 100 m above sea level., 16. vii. 2005, N. Kuhara (deposited in personal collection of N. Kuhara); 1 male, Nanae-cho, Onuma-choshi-guchi, 23. vi. 2003, T. Ito, net sweeping. Honshu, Iwate: 1 male, Oshu-shi, Koromogawa-ku, Omori, Misawa-gawa, Tatsumi-bashi, 19. vi. 2017, T. Ito, light pan trap. Shiga: 6 males, 1 female, Higashi-omi-shi, Kanzaki-gawa, Kazakoshi-dani, 29. v. 2015, T. Ito, light trap.
discussion
Remarks. The male of this species is distinguished from those of congeneric species by the hook-shaped rods of segment X, the almost straight form of the subgenital plate, the narrowly triangular inferior appendages with beak-like apices and the distallybifurcate aedeagus with a straight paramere. The female is described for the first time.
distribution
Distribution (Fig. 6). Russian Far East (Primorye, Sakhalin), Japan (Hokkaido, Honshu). New to Honshu. Habitat. Adults of this species were collected beside small stony streams. Japanese name. Sawa-himetobikera.