Hydroptila asymmetrica Kumanski, 1990

Ito, Tomiko, Ohkawa, Ayuko & Hattori, Toshio, 2011, The genus Hydroptila Dalman (Trichoptera, Hydroptilidae) in Japan, Zootaxa 2801, pp. 1-26 : 15-18

Hydroptila asymmetrica Kumanski, 1990

( Figs. 9 , 14 E)

Hydroptila asymmetrica Kumanski, 1990 , 50–52, figs. 56–63, male, female, Korea; Arefina et al., 2002, 97, Russian Far East (continental parts); Nozaki & Tanida, 2007, 245, 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 2.3–2.5 mm, 1.9–2.2 mm and 2.1–2.6 mm, respectively (n=7). Antennae 32–35-segmented; length 1.3–1.6 mm (n=7). Ventral process of sternite VII elongate, expanded at distal half, apex with rugose sculpturing. Segment IX with rounded antero-lateral apodemes and unequally developed distal margin, several setae present on each side in most specimens but absent on left side in few specimens. Dorsal plate membranous, roundish in lateral view, in dorsal view irregularly convex. Subgenital plate trilobed, lateral arms strongly sclerotized, subquadrate with apices acute, angled ventro-mesad in dorsal and ventral views, fused with membranous median lobe; short digitate process present ventro-mesally at base of each lateral arm. Phallic apparatus almost straight, tapered in basal half, characteristically curved to right in basal 3/5, apical 2/5 slender, apex subacute. Inferior appendages strongly sclerotized, short, subquadrate in lateral and ventral views.

Female. Lengths of forewing, hindwing and body 2.0– 2.7 mm, 1.7–2.4 mm and 1.8–3.3 mm, respectively (n=10). Antennae 24–26-segmented; length 0.8–1.0 mm (n=8). Abdominal segments rather pale. Sternite VI with small ventral process. Segment VIII with asymmetrical complicated sac-like structure mesally and 3–4 pairs of apical-margin setae. Segment IX often withdrawn from segment VIII in spirit specimens. Bursa copulatrix-lozenge shaped.

Specimens examined. Hokkaido: 1 male, Kushiro-shi, Akan-cho, Akan-kohan, Churui, 14.IX1999, TI, L; 1 female, Honbetsu-cho, Benkeido, 21.VII.1980, TI, L; 1 female, Mikasa-shi, Ikushunbetsu, 6.VII.1997, TI & AO; 1 female, Sapporo-shi, Takino, Ashiribetsu-no-taki, 28.VII.1978, TI, S; 3 females, Chitose-shi, Shikotsu-kohan, 28.VIII.1997, TI & AO, L; 11 males, 143 females, Shimamaki-mura, Ori-kawa, 23.VII.2005, NK, L (NK); 4 females, Imakane-cho, Makomanai-gawa, 17.VII.2005, NK (NK); 3 males, 3 females, Shiriuchi-cho, Idesu-gawa, Idesu-bashi, 26.VIII.1997, AO, L; 13 females, ibid., 6.VII.1998, AO, L; 8 males, 18 females, Shiriuchi-cho, Shiriuchi-onsen, 16.VI.1998, HN; 2 males, 4 females, Matsumae-cho, Oyobe-gawa, Gogo-bashi, 12.IX.2006, TI, L. Honshu. Aomori: 6 males, 27 females, Higashidori-mura, Noushi-gawa, 12–19 m, 14.IX.2010, L & P, TI; 1 male, Mutsu-shi, Simo-ogawa, Shozu-gawa, 66 m, 17.IX.2010, TI, L. Iwate: 2 females, Oshu-shi, Koromogawa-mura, Omori, 200 m, 21.VI.1997, TH, L. Miyagi: 4 females, Kawasaki-machi, Taro-gawa, 200 m, 22.VI.1997, TH, L. Yamagata: 6 females, Kaneyama-machi, Kanayama-gawa, Arakane-bashi, 11.X.1999, AO, L. Niigata: 1 female, Shibata-shi, Uchikawa-gawa, 200 m, 7.VII.1994, TH, L; 1 male, 2 females, Kanose-machi, Koara, 13.VI.1998, M. Maruyama. Ishikawa: 1 male, Kanazawa-shi, 4.VII.1998, T. Murakami; 1 male, 10 females, Hakusan-shi, Yoshinotani-mura, Chugu, 9.X.2000, HN. Shizuoka: 8 males, 7 females, Shizuoka-shi, Mizumiiro, 27.IX.1995, TH, L; 5 males, 6 females, Shizuoka-shi, Ushizawa, Moriya-sawa, 120 m, 26.VII–27.VIII.1995, TH, L; 7 females, Shizuoka-shi, Umegashima, Rokurogi, 420 m, 26.VII.1995, TH, L; 6 males, 65 females, Shizuoka-shi, Yunoshima, Warashina-gawa, 280 m, 19.VIII–15.X.1995, TH, L; 3 males, 6 females, Shizuoka-shi, Yuyama, Yuyama-gawa, 180 m, 22.IX.1995, TH, L; 13 females, Shizuoka-shi, Hirano, Kurobe-zawa, 400 m, 27.VIII.1995, TH, L; 1 female, Shizuoka-shi, Endo-shinden, Abe-kawa, 70 m, 25.VIII.1995, TH, L; 2 females, Shizuoka-shi, Tawarazawa, Abekawa, 130 m, 22.X.1995, TH, L; 1 male, Shizuoka-shi, Yujima, Abe-kawa, 150 m, 19.VIII.1995, TH, L; 1 female, Shizuoka-shi, Nyujima, Abe-kawa, 375 m, 25.IX.1995, TH, L; 4 females, Shizuoka-shi, Shinma, Shinmaya-gawa, 110 m, 14.VI.2005, TH, L; 1 female, Fujieda-shi, Kurata, 4.X.2003, TH, L; 9 males, 47 females, Hamamatsu-shi, Mori-machi, Oguni-jinja, 5.VII–1.VIII.2000, K. Sugisima; 2 females, Hamamatsu-shi, Inasa-cho, Tazawa, 31.VII.2000, K. Sugisima. Aichi: 1 male, 1 female, Shinshiro-shi, Horai-cho, 14.VII.1991, HN; 1 female, Shinshiro-shi, Horai-cho, Kansa-gawa, 15.VII.1999, HN. Mie: 1 female, Kisei-cho, 30.V.1991, H. Morita. Shiga: 6 males, 26 females, Higashi-omi-shi, Eigenji-cho, Kanzaki-gawa, 400 m, 5.IX.1998, TH, L; 4 males, 1 female, Koka-shi, Tsuchiyama, Minami-tsuchiyama, 15.IX.2008, NKA, L (MKNM). Hyogo: 15 females, Asago-shi, Ikuno-cho, Ikuno-damu, 23.VII.1997, T. Murakami; 1 female, Asago-shi, Wadayama, Ishibe-jinja, 3.XI.2006, K. Inazu & TI, L; 4 males, Kamigori-cho, Takayama, Amuro-gawa, 27–28.VII.2000, T. Murakami; 7 females, Yabushi, Oya-cho, Akenobu-gawa, 400 m, 23.IX.2003, TH, L; 2 females, Tanabe-shi, Kasuga-cho, Sonobe, Nantandamu, 22.VIII.2000, S. Tsukaguchi. Wakayama: 1 female, Kozagawa-shi, Hirai, 12–17.VII.1999, M. Maruyama. Tottori: 1 female, Nichinan-cho, Yukawa, Wakamatsu-gawa, 580 m, 14.IX.2002, TH, L. Shimane: 1 male, 1 female, Tsuwano-cho, Deiri, 8.X.2001, HN. Hiroshima: 1 male, Shobara-shi, Kawanishi-cho, 27.IX.2001, S. Nakamura; 1 male, Yoshiwa-mura, Nakatsuya-gawa, 720 m, 15.IX.2002, TH, L. Shikoku. Tokushima: 1 female, Anan-shi, Naga-gawa, 11–13.X.1998, S. Tsukaguchi; 1 male, Tsurugi-cho, Ichiu-son, Kuwadaira, Nazawadani, 880 m, 25.IX.2002, TH. Ehime: 1 male, 1 female, Kumakogen-cho, Omogo-mura, Kanmon, 23.V.1999, TI & AO, S; 6 males, 5 females, Kumakogen-cho, Omogo-mura, Teppoishi-gawa, camp site, 22.V.1999, TI & AO, S; 4 males, Ozu-shi, Hijikawa, Shimasaka-damu, 7–9.VIII.2000, S. Tsukaguchi. Kochi: 1 male, 4 females, Nahari-cho, 30.VII.1996, S. Tsukaguchi. Kyushu. Fukuoka: 1 male, 4 females, Hisayama-machi, Ino, Todoroki-gawa, Todoroki-bashi, 21.IX.2000, AO, L. Nagasaki: 10 females, Oseto, Gotsu-gawa, Iwaseto-bashi, 7.VI.2001, T. Fujitani, L; 2 males, 1 female, Omura-shi, Kori-gawa, 17.IX.2002, TH, L. Nagasaki, Tsushima Islands: 185 males, 327 females, Tsushima-shi, Kamiagata-cho, Sago, 15 km south of Kounoki-yama, 22–23.VII.2009, RBK, L (RBK); 4 males, 7 females, Tsushima-shi, Izuhara-cho, Azamo, near estuary, 19.VII.2009, RBK, L (RBK); 1 female, Tsushima-shi, Izuhara-cho, Azamo, mountain stream, 17.VII.2009, RBK, L (RBK). Kumamoto: 1 male, Minami-asomura, Hakusui, Nakamatsu, Aso Tanibito Museum, IX.2002, AO. Miyazaki: 2 females, Aya-cho, Honji-gawa, 170 m, 20.IX.2002, TH, L. Kagoshima, Amami Islands: 4 males, 2 females, Tatsugo-cho, Toguchi-gawa, 27.III.1998, HN, L; 2 males, 6 females, ibid., 18.III.1999, TI & AO, L; 2 females, Amami-shi, Sumiyo-son, Niimura, 19.III.1999, TI & AO; 21 males, 54 females, Uken-son, Ogachi-gawa, Takinoshita, 19.III.1999, TI & AO, L; 5 males, 25 females, Uken-son, Kawauchi-gawa, 50 m, 26.III.2007, TI, L; 3 males, Uken-son, Yakusho-gawa, middle reach, 5.V.2008, TI, P. Okinawa, Okinawa Island: 17 males, 106 females, Kunigami-son, Yona, Sukunagawa, 21.III.1999, TI & AO, L; 2 females, Kunigami-son, Yona-gawa, Nakafukuji-hashi, 23.XI.2010, TI, P. Okinawa, Yaeyama Islands: 21 males, 17 females, Ishigaki-jima, Omoto-dake, 18–19.III.2002, I. Oshima et al., L.

Remarks. This species is broadly distributed on the main Japanese islands and also occurs on the southwestern islands (Nansei Islands). This distribution pattern is unique for Japan, since the caddisfly faunas of the main islands and southwestern islands are usually quite different from each other ( Tanida 1997). The males of this species can be separated from Japanese congeners by the asymmetrical segment IX, and strongly sclerotized quadrate inferior appendages and lateral arms of the subgenital plate. The female of this species is distinguishable from other Japanese congeners by the asymmetrical internal genital structures.

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

Habitat. Adults were collected from streams in mountain and lowland areas.

Japanese name. Migi-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.