Hydroptila dampfi Ulmer, 1929

Ito, Tomiko, Ohkawa, Ayuko & Hattori, Toshio, 2011, The genus Hydroptila Dalman (Trichoptera, Hydroptilidae) in Japan, Zootaxa 2801, pp. 1-26 : 11-12

Hydroptila dampfi Ulmer, 1929

( Figs. 6 , 14 C)

Hydroptila dampfi Ulmer, 1929 , 264–266, figs. 10–12, male, Germany; Malicky, 2004a, 52, male.

Hydroptila itoi Kobayashi, 1977 , 5, 12, pl. 4, male, female, Japan; Ito & Kawamura, 1980, 113–121, figs. 1–27, pupa, larva, case, habitat, life cycle, feeding behavior; Morse et al., 2001, 102, Russian Far East (continental parts); Ito, 2005, 442, 444, 446, figs. 19, 21, male, larva, case. New synonym.

Adult. Wings dark brown with several small lighter markings. Antennae brown to light brown with darker markings at about half length and at apices.

Male. Lengths of forewing, hindwing and body 2.5–2.8 mm, 2.1–2.2 mm and 2.6–3.2 mm, respectively (n=5). Antennae 34–37-segmented and 1.5–1.7 mm long (n=5). Ventral process of sternite VII short, subacute apically. Segment IX short, with large antero-lateral apodemes, posterior margin with small sub-triangular process posteromesally and small rounded lobes postero-laterally. Dorsal plate semi-membranous, quadrate with divergent postero-lateral angles and slight concavity on apical margin. Subgenital plate membranous, triangular in ventral view, with 2 fine setae mesally. Phallic apparatus slender, almost straight, with short spiral titillator at half length. Inferior appendages slender, elongate, 1.5 times length of dorsal plate; directed posterad in proximal 2/3 and gently curved upward at apical 1/3, with apex subacute in lateral view; small swelling present near base of dorsal margin.

Female. Lengths of forewing, hindwing and body 3.0– 3.3 mm, 2.8–2.9 mm and 3.0– 3.4 mm, respectively (n=5). Antennae 24–28-segmented; length 0.9–1.1 mm (n=5). Abdomen increasingly darker from segment I to segment VIII. Ventral process of sternite VI small, subacute apically. Segment VIII with tergite in form of 4 small roundish sclerites, sternite large; 4 dorsal sclerites arranged in 2 longitudinal series; anterior tergite without setae, each of posterior tergites with 5–7 setae; sternite convex laterally, deeply excised posteriorly, convex anteriorly, with 4 pairs of strong setae. Bursa copulatrix narrowly lozenge-shaped.

Immature stages. Pupae and larvae have been described by Ito & Kawamura (1980).

Specimens examined. Hokkaido: 1 female, Shibetsu-cho, Sokippu-kaomanai-gawa, 12.VIII.1996, TI & AO, S; 1 male, Shibecha-cho, Kayanuma, Ikoinoie, 6.X.2003, TI & AO, L; 42 males, 32 females, ibid., 29.VIII.2005, TI, L; 1 female, ibid., 7.VIII.2006, TI, L; 8 males, 4 females, Kushiro-shi, Akan-cho, Ibeshibetsu-gawa, 425 m, 13.IX.1999, TI, L; 5 males, 2 females, Kushiro-shi, Akan-cho, Akan-kohan, Ibeshibetsu, 9.VI.1979, TI, R; 1 female, ibid., 10.IX.1995, TI & AO, S; 64 males, 44 females, ibid., 23.VII–21.IX.1996, TI & AO, L & S; 12 males, 3 females, ibid., 14.VII–13.VIII.1997, TI & AO, L; 10 males, 6 females, ibid., 21.VIII.1998, TI & AO, L; 4 males, 7 females, ibid., 26.VII.1999, TI & AO; 204 males, 78 females, Kushiro-shi, Akan-cho, Akan-kohan, Churui, 14.IX.1999, TI, L; 3 males, 39 females, Sarufutsu-mura, Mokeuni-numa, 31.VII.2007, TI, L; 2 males, 3 females, Chitose-shi, Chitose-ko, 8.VII–25.VIII.2001, TI & AO, L; 2 females, Tomakomai-shi, Uenae, Bibi-gawa, 4 m, 8.VII–5.VIII.2010, TI, L; 6 males, 5 females, Tomakomai-shi, Utonai-ko (type locality of H. itoi Kobayashi, 1977 ), 7.VII–28.VIII.1976, TI, S; 186 males, 39 females, ibid., 9.VII-6.VIII.1977, TI & TH, L & R; 1 male, 2 females, 2 pupae, ibid., 20.VII.1996, TI; 11 males, 8 females, ibid., 20.VII.1997, TI; 54 males, 39 females, ibid., 29.VII.1998, TI & AO, S & L; 5 males, 1 female, ibid., 18.VI.1999, TI, L; 8 males, 1 female, ibid., 22.VII.2001, TI & AO, S; 80 males, 28 females, ibid., 22.VII.2004, TI, L; 46 males, 5 females, ibid., 12.VIII.2007, TI, L; 2 males, Nanae-cho, Onuma, Choshiguchi, 23.VI.2003, TI & AO, S; 1 male, 1 female, ibid., 4.VIII–11.IX.2006, TI and TH, L; 4 males, Nanae-cho, Onuma, Tsukimi-bashi, 23.VI.2003, TI & AO, L. Honshu. Yamanashi: 20 males, 4 females, Fujikawaguchiko-machi, Kawaguchi-ko, Oishi, 830 m, 1.VI.1994, TH. Shizuoka: 102 males, 71 females, Fujieda-shi, Midori-cho, Aoike, 17.VI.2005, TH, L. Shiga: 3 males, 2 females, Biwa-ko, Yamashita-wan, 13.IV.1977, TI, R; 33 males, 146 females, Otsu-shi, Shimo-sakamoto, Otsu Hydrobiological Station, 20.VII.1984, KT, L (LBM); 5 males, 5 females, ibid., 20.VII.1984, KT, L; 5 males, ibid., 22–23.X.1985, H. Nishida (LBM); 4 males, 10 females, ibid., 3.VII.1986, N. Kobayashi, L (LBM); 9 males, 7 females, ibid., 3.VII.1987, KT, L (LBM); 2 females, Otsushi, Ogoto-kita, 6.VIII.1987, KT, L (LBM); 1 male, 1 female, Biwa-ko, Harie-hama, 24.V.1988, TN; 6 males, 10 females, Biwa-ko, Kusatsu, 10.VII.1999, HN; 30 females, Hikone-shi, Iso, 9.IX.1986, N. Kobayashi, L (LBM); 1 male, 1 female, Hikone-shi, Kenritsu-daigaku, 3–4.X.1998, AO; 4 males, Nagahama-shi, Nishi-azai-cho, Ourakoen, 6.XI.1986, KT (LBM); 1 male, ibid., 3.VI.1988, KT, L (LBM); 1 female, Nagahama-shi, Nishi-azai-cho, Tsukide, 4.VII.1986, N. Kobayashi, L (LBM); 1 male, Nagahama-shi, Takatsuki-cho, Katayama, 6.XI.1986, N. Kobayashi, L (LBM); 1 male, 1 female, Omi-hachiman-shi, Maki, 8.IX.1986, M. Nishino, L (LBM); 3 males, 34 females, Higashi-omi-shi, Fuse, Fuse-tameike, 14–15.IX.2008, NKA, L (MKNM).

Remarks. This species is unique among Japanese Hydroptila , both in that it is the only species that is also common to the European fauna and in that it lives only in standing water. It is easily distinguished from other Japanese species by the shapes of the dorsal plate and the inferior appendages in the male and the 4 dark sclerites on segment VIII in the female.

Distribution. Japan (Hokkaido, Honshu), China, Russian Far East (continental parts), Europe.

Biology. The larvae live on macrophytes in lakes and marshes, feeding on the cell contents of filamentous algae ( Ito & Kawamura 1980). The life cycle is univoltine, the first 4 larval instars taking about 10 months to complete development in Hokkaido, northern Japan ( Ito & Kawamura 1980).

Japanese name. Numa-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 5 – 6. 5, H. oguranis: A – C, male; A—abdominal segments VIII – X, lateral; B—genitalia, dorsal; C—same, ventral; D – F, female; D—abdominal segment VIII, lateral; E—abdominal segments VII – X, dorsal; F—same, ventral. 6, H. dampfi: A – C, male; A—abdominal segments VII – X, lateral; B—genitalia, dorsal; C—same, ventral; D – F, female; D—abdominal segments VII – X, ventro-lateral; E—same, dorsal; F—same, ventral.