Stactobia nishimotoi Botosaneanu & Nozaki 1996

Ito, Tomiko, 2017, The genus Stactobia McLachlan (Trichoptera, Hydroptilidae) in Japan, Zootaxa 4350 (2), pp. 201-233 : 218-219

Stactobia nishimotoi Botosaneanu & Nozaki 1996

( Figs 10 , 19 )

Stactobia nishimotoi Botosaneanu & Nozaki, 1996 , 58–61, holotype male, Honshu (Aichi). Stactobia sp.: Kuhara & Ito 2017, 16, Yakushima.

Diagnosis. This species belongs to the S. martynovi Species Group and is distinguished from congeneric species by the shape and position of the 2 short internal spines of the phallus.

Description. Male ( Figs 10A–10E ). Antennae each 18-segmented and 0.6–0.8 mm long (n = 7). Length of each forewing and hind wing 1.6–2.4 mm and 1.4–2.1 mm, respectively (n = 7). Tibial spur formula 1, 2, 4.

Genitalia. Tergite VII almost as long as sternite VII, sternite VII with ventral process long, apically expanded, spiny. Tergite VIII longitudinally shorter than sternite VIII. Tergite IX with pair of long anterior apodemes, sternite IX reduced. Tergite X semimembranous, weakly sclerotized dorsolaterally. Subgenital appendages transversely slender, rounded at mesal edges in ventral view. Inferior appendages small, in ventral view tightly arched. Phallus long, almost straight, rounded apically; with slender bar and 2 short, strongly sclerotized spines internally, situated at middle and apex, middle spine long, about 7 times as long as basal width, gently curved, directed posterad and apical spine 4 times as long as basal width, slightly curved, directed anterad.

Larva. Unknown.

Specimens examined. HONSHU. Miyagi: 1 male, Sendai-shi, Futakuchi, Natori-gawa, 400 m, a.s.l., 8.vi.1974, TH . Hyogo: 1 male, Asago-shi, Kamikawa-cho, Onakai, 4.v.2006, K. Inazu ; 1 male, Asago-shi, Kamikawa-cho, Miyahashi, 4.v.2006, K. Inazu. Shimane: 9 males, Misato-cho, Daiwa, Nagato, Hibiki-dani, 6.viii.2001, AO. SHIKOKU . Kochi: 1 male, Shimanto-shi, Nishitosa, Kuroson-keikoku, 1.v.2004, MT ( PTN). KYUSHU . Oita: 16 males, Yufu-shi, Yufuin, Kawanishi, Mizuwake-toge, 15.x.1992, NK . Kagoshima, Yakushima : 4 males, Yakushima-cho, Yoshida-gawa, Yoshida-bashi, 25.ix.2003, NK.

Distribution ( Fig. 19 ). Honshu (Miyagi, Aichi, Hyogo, Shimane); Shikoku ( Kochi); Kyushu (Oita); Yakushima. Newly recorded for Shikoku, Kyushu, and Yakushima.

Habitat. Adults of this species were collected by the above colleagues near fast flowing streams.

Japanese name. Nishimoto-kaku-himetobikera (newly given here).

Figures

FIGURE 10. Stactobia nishimotoi Botosaneanu & Nozaki 1996. Male. 10 A, abdominal segments VII – X, left lateral; 10 B, abdominal segments IX – X, left lateral; 10 C, same, dorsal; 10 D same, ventral; 10 E, phallus, left lateral. Specimen: Hyogo, Kamikawa-cho. Scale bar: 0.1 mm for 10 A.

FIGURE 19. Distributions in Japan of 7 species of Stactobia.