Stactobia hattorii Botosaneanu & Nozaki 1996

Ito, Tomiko, 2017, The genus Stactobia McLachlan (Trichoptera, Hydroptilidae) in Japan, Zootaxa 4350 (2), pp. 201-233 : 215-216

Stactobia hattorii Botosaneanu & Nozaki 1996

( Figs 8 , 18 )

Stactobia hattorii Botosaneanu & Nozaki, 1996 , 56–58, holotype male, Honshu (Shizuoka).

Diagnosis. This species belongs to the S. martynovi Species Group and is distinguished from congeneric species by the short, twisted phallic spine.

Description. Male ( Figs 8A–8D ). Antennae each 18-segmented and 0.8–1.0 mm long (n = 5). Length of each forewing and hind wing 2.0– 2.2 mm and 1.5–1.8 mm, respectively (n = 5). Tibial spur formula 1, 2, 4.

Genitalia. Tergite VII longer than sternite VII, sternite VII expanded at anterior margin in lateral view, ventral process long with expanded spiny apex. Tergite VIII longitudinally shorter than sternite VIII. Tergite IX with pair of long anterior apodemes, sternite IX reduced. Tergite X semimembranous with pair of weakly sclerotized, wide, transverse bands dorsolaterally. Subgenital appendages small, narrowly triangular, with heavily sclerotized and rounded apices in ventral view. Inferior appendages small, subquadrate in lateral view, M-shaped with rounded, heavily sclerotized mesal edges in ventral view. Phallus long, almost straight, slightly flattened, with subacute apex; internal spine strongly twisted twice, short, 10–12 times as long as basal width.

Larva. Unknown.

Specimens examined. HONSHU. Shizuoka: 2 males, Shizuoka-shi, Oi-gawa, 1200 m a.s.l., 29.iv.1996, TH (paratypes, PTN) . Kyoto: 1 male, Kyoto-shi, Kibune, Kibune-gawa, 29.v.2000, K. Endo . Hyogo: 20 males, Sekinonomiya-cho, Hyonosen, 15.v.1993, NK ; 1 male, Chisa-cho, Itanami-keikoku, 550 m a.s.l., 12.ix.2002, TH. Okayama: 10 males, Nagi-cho, Takimoto, Takiyama, 24.ix.2011, KN ; 1 male, Tsuyama-shi, Okutsugawa, 5.v.2011, KN; 3 males, Tsuyama-shi, Kamo-cho, Kurami, 4.vi.2016, KN; 49 males, Nishi-awakura-son, Ogaya , 20 & 24.vii.2016, KN.

Distribution ( Fig. 18 ). Honshu (Shizuoka, Kyoto, Hyogo, Okayama).

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

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

Figures

FIGURE 8. Stactobia hattorii Botosaneanu & Nozaki 1996. Male. 8 A, abdominal segments VII – X, left lateral; 8 B, abdominal segments IX – X, ventral; 8 C, same, dorsal; 8 D, phallus, left lateral. Specimen: Okayama, Tsuyama-shi. Scale bar: 0.1 mm for 8 A.

FIGURE 18. Distributions in Japan of 6 species of Stactobia.