Hydroptila coreana Kumanski, 1990

Ito, Tomiko, Ohkawa, Ayuko & Hattori, Toshio, 2011, The genus Hydroptila Dalman (Trichoptera, Hydroptilidae) in Japan, Zootaxa 2801, pp. 1-26 : 18-19

Hydroptila coreana Kumanski, 1990

( Figs. 10 , 14 E)

Hydroptila coreana Kumanski, 1990 , 52–54, figs. 72–79, male, female, Korea; Arefina et al., 2002, 98, Russian Far East (continental parts); Mey & Nozaki, 2006, 24, Japan (Honshu).

Adult. Wings dark brown with several small lighter markings. Antennae brown to light brown with darker marking at apical parts.

Male. Lengths of forewing, hindwing and body 2.6–2.8 mm, 2.3–2.5 mm and 1.3–1.5 mm, respectively (n=5). Antennae 32–35-segmented and 1.3–1.5 mm long (n=5). Ventral process of sternite VII long with expanded, rugosely sculpted apex. Segment IX with rounded apico-lateral apodemes, pair of small setal processes mid-laterally on sternite. Dorsal plate sclerotized, in lateral view short stout structure, divided and directed ventrad apically; in dorsal view tripartite, short wide rectangle medially between paired short stout beak-like processes. Subgenital plate trilobed, lateral arms well sclerotized, apically truncate in dorsal and ventral views, in lateral view lateral arms rectangular with rounded apices, fused with membranous median lobe. Phallic apparatus slender and elongate, with curled subapical process and short titillator. Inferior appendages in ventral view plate-like with expanded apices; apices ellipsoidal in lateral view.

Female. Lengths of forewing, hindwing and body 2.5–3.0 mm, 2.0– 2.7 mm and 2.6–3.5 mm, respectively (n=5). Antennae 25–27-segmented; length 0.9–1.0 mm (n=5). Sternite of segment VIII small lozenge-shaped, in ventral view a small median dark semi-circular area on anterior margin; internal sclerite lozenge-shaped in ventral view, rectangular in lateral view; 2 pairs of apical-marginal setae ventrally and 1 pair dorsally. Bursa copulatrix slender, lozenge-shaped.

Specimens examined. Hokkaido: 2 males, females, Shibecha-cho, Kayanuma, Shirarutoro-etoro-gawa,Tomibashi, 16.VII.2009, TI, L; 222 females, Shibecha-cho, Kayanuma, Shirarutoro-etoro-gawa, 17 m, 16.VII.2009, TI, P; 1 male, 2 females, Kushiro-shi, Akan-kohan, Ibeshibetsu, 9.VIII.2007, TI, L; 1 male, 4 females, Eniwa-shi, Eniwa-ohashi, 14.VII.2001, TI & AO, L; 1 female, ibid., 9–15.VII.2005, TI, L; 1 female, Eniwa-shi, Rarumanaigawa, Hakusen-no-taki, 15–21.VII.2001, TI et al., L; 1 female, Chitose-shi, Monbetsu-gawa, 240 m, 14.VII.2000, TI et al., L; 14 males, 31 females, Imakane-cho, Pirika-sukii-jo, 27.VII.2004, TI, L; 2 females, ibid., 14.X.2006, TI, L; 15 males, 50 females, Imakane-cho, Kami-suzunohara, Makomanai-gawa, 17.VII.2005, NK, L (NK); 1 male, 2 females, Oshamanbe-cho, Toyotsu-horonai-gawa, 30.VI.2007, NK (NK). Honshu. Iwate: 4 males, 3 females, Oshu-shi, Koromogawa-mura, Omori, 200 m, 21.VI.1997, TH, L. Miyagi: 5 males, 12 females, Kawasaki-machi, Taro-gawa, 200 m, 22.VI.1997, TH, L. Akita: 1 male, 4 females, Gojome-machi, Jabami, 12.IX.2003, TH, L.

Yamagata: 8 females, Kaneyama-machi, Kanayama-gawa, Arakane-bashi, 11.X.1997, AO, S. Gifu: 1 female, Takayama-shi, Hikagedaira, 20.IX.1998, HN. Aichi: 1 female, Toyota-shi, Kashio-gawa, 26.IX.1999, Tanaka; 3 males, 5 females, Toyota-shi, Kujudaira-cho, Tomoe-gawa, 30.V.2000, HN & H. Morita; 1 male, 3 females, Toyota-shi, Fuso-cho, Yahagi-gawa, 23.V.2000, HN; 1 male, 1 female, Shinshiro-shi, Horai-cho, Kansa-gawa, 15.VII.1999, HN; 1 female, Asahi-cho, Oda, 9–10.VII.1999, K. Sugisima. Shiga: 3 females, Higashi-omi-shi, Eigenji-cho, Kanzai-gawa, 400 m, 5.IX.1998, TH, L; 2 males, Koka-shi, Minakuchi, Nasaka, Imaike, Daichiji, 4.VII.2009, NKA, L (MKNM); 3 males, 8 females, Koka-shi, Tsuchiyama, Minami-tsuchiyama, 15.IX.2008, NKA, L (MKNM). Kyoto: 5 males, 5 females, Kasagi-cho, Kizu-gawa, 2.IX.1997, K. Tojo. Hyogo: 2 males, 7 females, Asago-shi, Ikuno-cho, Ikuno-damu, 23.VII.1997, T. Murakami; 23 females, Oya-cho, Akenobu-gawa, 400 m, 23.IX.2003, TH, L. Nara: 1 male, 1 female, Yamazoe-mura, Hirose, Nabari-gawa, 28.VIII.1997, K. Tojo. Tottori: 3 males, 11 females, Nichinan-cho, Yukawa, Wakamatsu-gawa, 580 m, 14.IX.2002, TH, L. Shimane: 1 male, 2 females, Ota-shi, Sanbe, Ukinuno-no-ike, 5.VIII.2001, AO, L; 8 males, 138 females, Tsuwano-cho, Deiri, 8.X.2001, HN. Okayama: 2 males, 3 females, Tsuyama-shi, Kagamino-cho, Terawada, Kagami-gawa, 7.VIII.2001, HN & AO. Hiroshima: 4 males, 1 female, Kozan-cho, Kasa-kyo, Hattabara-damu, 1.X.1998, S. Nakamura; 1 male, Hiroshima-shi, Yagi, Ota-gawa, 1.X.1998, S. Nakamura; 1 female, Togochi-machi, Sandankyo, 31.V.1999, HN; 1 male, 10 females, Yoshiwa-mura, Nakatsuya-gawa, 720 m, 15.IX.2002, TH, L. Ya m ag u c hi: 17 males, 161 females, Mine-shi, Shuho-cho, Kama, Koto-gawa, 7.X.2001, HN. Shikoku. Tokushima: 9 males, 1 female, Anan-shi, Naka-gawa, 11–13.X.1998, S. Tsukaguchi. Ehime: 1 male, 1 female, Ozu-shi, Hijikawa-cho, Shimasaka-damu, 7–9.VIII.2000, S. Tsukaguchi. Kochi: 6 males, 5 females, Kami-shi, Tosayamada-cho, Sano, 5.X.2000, HN; 15 males, 26 females, Motoyama-machi, Yoshino-gawa, 250 m, 24.IX.2002, TH, L. Kyushu. Oita: 18 males, 77 females, Nakatsu-shi, Yabakei-machi, Miyazono, Yamaguchi-gawa, 17.IV.2004, TH, L. Miyazaki: 5 males, 11 females, Aya-cho, Honji-gawa, 170 m, 20.IX.2002, TH, L; 6 females, Aya-cho, Honji-gawa, 40 m, 21.IV.2004, TH, L.

Remarks. The male of this species is rather similar to that of H. asymmetrica in having the lateral arms of the subgenital plate as well as the inferior appendage well sclerotized, but most parts of the male and female genitalia of this species are symmetrical. The female of this species is quite similar to that of H. spinosa , but H. coreana can be distinguished from H. spinosa by the sclerotized internal sclerite.

Distribution. Japan (Hokkaido, Honshu, Shikoku, Kyushu), Korea, Russian Far East (continental parts).

Habitat. Adults were collected from mountain and lowland streams.

Japanese name. Chosen-hime-tobikera.

Figures

FIGURE 14. Distributions of 12 species of Hydroptila in Japan and adjacent areas. For clarity, nearby collection sites in Japan are grouped together as a single point and the sites are roughly plotted in adjacent, non-Japanese areas.

FIGURES 9 – 10. 9, H. asymmetrica: A – D, male; A—abdominal segments VII – X, lateral, left; B—abdominal segments IX – X, lateral, right; C—genitalia, dorsal; D—same, ventral; E – G, female; E—abdominal segment VIII, lateral; F—same, dorsal; Gabdominal segments VII – X, ventral. 10, H. coreana: A – D, male; A—ventral process with enlarged apex; B—genitalia, lateral; C—same, dorsal; D—same, ventral; E – G, female; E—abdominal segment VIII, lateral; F—same, dorsal; G—abdominal segments VII – X, ventral. Abbreviations: la spl, lateral arm of subgenital plate; ml, median lobe of subgenital plate; others as in Fig. 1.