Diplectrona burha Schmid 1961

Ito, Tomiko & Nozaki, Takao, 2018, The family Hydropsychidae Curtis (Trichoptera) in the Ryukyu Archipelago, southwestern Japan, Zootaxa 4504 (4), pp. 545-565 : 547

Diplectrona burha Schmid 1961

( Figs 2 A– 2I)

Diplectrona burha Schmid 1961 , 200–201, pl. 17, male, Pakistan (Himalaya, Karakoram); Malicky 2002, 1205–1206, 1218, 1233, pl. 14, male, Pakistan, India, Nepal, Thailand, Vietnam, Taiwan.

Adult ( Figs 2 A– 2I). Forewings each 4.9–6.1 mm in male (n = 8), 5.6–7.2 mm long in female (n = 8). Wing venation typical in the genus. Lateral filaments of segment V longer than the segment in both genders. Internal gland of segment V small, internal gland of segment VIII absent in male.

Female genitalia ( Figs 2 G– 2I). Tergite VIII subquadrate with round postero-lateral corners in lateral aspect. Sternite VIII subquadrate with slightly undulated dorsal margin and nearly rectangular large lateral lobes in lateral aspect. Segment IX obliquely S-shaped in lateral aspects, each antero-ventral corner protruding anteriorly; receptacle of inferior appendage indistinct. Segment X oblique rectangular.

Specimens examined. Amami-o-shima: 1 male, Setouchi-cho, Miyama-gawa, small tributary near Dainimiyama-bashi , 26.x.2011, TI , S; 1 female, Uken-son, Kawauchi-gawa, small fall, 25.x.2011, TI , P & S; 3 males, Sumiyo-cho, Kamiya, Kawauchi-gawa , tributary, 20–21.iv.2015 , SI, P; 16 males, 9 females, Yamato-son, Yuwangawa , headwater, 18–19.iv.2015 , SI, P; 3 males, 2 females, Yamato-son, Yuwan-gawa , small stream, 18– 19.iv.2015 , SI, P; 1 male, Yamato-son, Materia-gawa , 1.v.2017 , N. Katsuma. Okinawa-jima : 2 females, Nago-shi, Genka-gawa, Hogen-hashi , 22–24.xi.2010, TI , P; 1 male, same locality, 8.iv.2011, TI , P; 1 male, same locality, 17– 18.x.2014, TI , L; 1 female, Kunigami-son, Hiji-gawa, 9.iv.2011, TI , L; 1 male, Kunigami-son, Okuma, Okumagawa , upper reach, 2.i.2016 , M. Enju. Ishigaki-jima : 2 males, Omoto-dake, 13–21.x.1999, KK, M; 1 male, same locality, 11.v.2007 , KK, L; 1 male, Omoto-dake, small stream near foot path, 13.iv.2011, TI , S; 1 male, same locality, 26.x.2012, TI , S; 3 females, Nagura-gawa, 18 m above sea level (a.s.l.), 25.x.2012, TI , P & S; 1 male, same locality, 27.xi.2013, TI , S; 1 female, Miyara-zawa, 60 m a.s.l., 22.x.2012, TI , S. Iriomote-jima: 1 female, Aira-gawa, 25 m a.s.l., 21.iii.2016, TI , L; 1 male, Urauchi-gawa, small stream near Boat Station , 18.x.2015, TI , S.

Distribution. Japan: Ryukyu (Amami-o-shima, Okinawa-jima, Ishigaki-jima, Iriomote-jima). Pakistan, India, Nepal, Thailand, Vietnam, Taiwan. New to Japan.

Remarks. This species is widely distributed in southeastern Asia with some morphological variation in male genitalia ( Malicky 2002, Pl. 14). The male of this species is characterized by the long lateral filaments of segment V (1–2 times segment length), small internal glands (“Blasen” of Malicky 2002) of segment V, absence of internal glands of segment VIII, and shape of genitalia ( Malicky 2002; Fig. 2A ). The male genitalia are distinguished from those of other congeneric species mainly by segment X ( Fig. 2C ); i.e. each subquadrate lateral lobe (l.l.) often with depression in apical margin in dorsal aspect, the developed mesocaudal lobe (m.c.l.) with middle slit in dorsal aspect, and large preanal appendages (p.a.) ( Malicky 2002, pl. 14; Fig. 2C ). The female, first described here, is discriminated from those of other congeneric Ryukyu species by the very slightly undulate dorsal margin of sternite VIII (marked with an arrow in Fig. 2G ).

Japanese name. Buruha-miyama-shima-tobikera.

Figures

FIGURE 2. Diplectrona burha Schmid and D. albofaciata Ulmer. Diplectrona burha (2A–2I): male (2A–2F): 2A, abdominal segments V–X, left lateral; 2B, genitalia, left lateral; 2C, same, dorsal; 2D, left inferior appendage, ventral; 2E, phallic apparatus, left lateral; 2F, apex of phallic apparatus, ventral; female (2G–2I): 2G, abdominal segment VIII, left lateral; 2H, abdominal segments IX–X, left lateral; 2I, abdominal segments VIII–X, ventral. Diplectrona albofaciata (2J–2R): male (2J– 2O): 2J, abdominal segments IV–X, left lateral; 2K, genitalia, left lateral; 2L, same, dorsal; 2M, left inferior appendage, ventral; 2N, phallic apparatus, left lateral; 2O, apex of phallic apparatus, ventral; female (2P–2R): 2P, abdominal segment VIII, left lateral; 2Q, abdominal segments IX–X, left lateral; 2R, abdominal segments VIII–X, ventral. Abbreviations: V–X = abdominal segments V–X; l.l. = lateral lobe (paired); m.c.l. = mesocaudal lobe (paired); p.a. = preanal appendage (paired). Arrows, see text.