The genus Stactobiella Martynov (Trichoptera, Hydroptilidae) in Japan Author Ito, Tomiko text Zootaxa 2020 2020-03-09 4748 3 561 571 journal article 10.11646/zootaxa.4748.3.9 75d37244-7649-49b9-b6f8-f603c61005b8 1175-5326 3815024 850379E4-B780-4D14-9B4B-9F753849D51B Stactobiella tshistjakovi ( Arefina & Morse 2002 ) ( Figs 1 , 6 ) Stactobia tshistjakovi Arefina & Morse in Arefina et al . 2002 , 103–104, male, Russian Far East (Khasansky); Arefina & Armitage 2003 , 17, Russian Far East ( Sakhalin ). Stactobiella tshistjakovi : Arefina 2004 , 209; Ito et al . 2010 , 57, Japan ( Hokkaido ); Ito 2013 , 51, 80, Japan ( Hokkaido ); Potikha & Vshivkova 2016 , 364, Russian Far East (Primorye); Ito 2017 , 40, Japan ( Hokkaido ); Ito 2018 , 508, 511, Japan ( Hokkaido ). Revised description . Adult . Wings brown, some light brown patterning in forewings, but often indistinct in alcohol; light brown dots absent in hind wings. Wing length: males (n=5), forewings each 1.8–2.0 mm and hind wings each 1.6–1.8 mm ; females (n=5), forewings each 2.0– 2.2 mm and hind wings each 1.8–1.9 mm . Antennae brown; in male (n=5), each 18-segmented, 0.8–1.1 mm long; in female (n=5), each 18-segmented, 0.6–0.7 mm long. Short ventral process on abdominal segment VII in male and on VI in female. Male ( Figs 1 A–1F). 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 1G, 1H ). 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 . 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 ( 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.