Cheumatopsyche clavalis Martynov 1930

Ito, Tomiko & Nozaki, Takao, 2018, The family Hydropsychidae Curtis (Trichoptera) in the Ryukyu Archipelago, southwestern Japan, Zootaxa 4504 (4), pp. 545-565 : 555-556

Cheumatopsyche clavalis Martynov 1930

( Figs 5 H–5P)

Cheumatopsyche clavalis Martynov 1930 , 82, figs 26–27, male, Taiwan. Cheumatopsyche uchidai Kobayashi 1987 , 40, 46, figs 19–21, male, Taiwan; Oláh et al. 2008, 66–67, figs 159–162, holotype male, Taiwan. New synonym.

Adult ( Figs 5 H–5P). Forewings each 5.9–6.2 mm long in male (n = 5), 6.0– 6.5 mm long in female (n = 5). Wing venation typical in the genus.

Female genitalia ( Figs 5 O–5P). Tergite VIII subquadrate with convex posterior margin in lateral aspect. Sternite VIII subquadrate, larger than tergite VIII, with oblique straight dorsal margin and large subquadrate lateral lobes in lateral aspect, ventral cleft almost parallel in ventral aspect. Segment IX obliquely S-shaped in lateral aspects; receptacle of inferior appendage (rec.) dome shaped. Segment X oblique rectangular.

Specimens examined. Ishigaki-jima: 3 males, 1 female, Omoto-dake, 13.x.1999, KK, L; 8 males, 60 females, same locality, 18–19.iii.2002, I. Oshima et al., L ; 2 females, Miyara-gawa, 60 m a.s.l., 12.iv.2011, TI , P & S; 11 males, 12 females, same locality, 27.x.2012, TI , P & S; 89 males, 4 females, same locality, 20.x.2015, TI , L; 26 males, 23 females, same locality, 30.iii.2016, TI , L & S; 2 males, 16 females, Miyara-gawa, 45 m a.s.l., 27.x.2012, TI , P; 65 males, 37 females, Nagura-gawa, 8–18 m, 11–12.iii.2009, TI , L, P & S; 11 males, 51 females, same locality, 11–13.iv.2011, TI , L, P & S; 37 males, 34 females, same locality, 25–30.x.2012, TI , L, P & S; 1 male, 3 females, same locality, 26–28.xi.2013, TI & RS, L, P & S; 29 males, 53 females, same locality, 18–20.iii.2016, TI , L, P & S; 28 males, 44 females, Nagura-gawa, Shinsui Park, 11.iv.2011, TI , P; 1 female, same locality, 27.x.2013, TI , L; 5 males, Nagura-gawa, Tore-bashi, 25.x.2012, TI , L; 21 males, 4 females, Nagura-gawa, Takeda, 12.x.1999, KK, L; 5 males, 6 females, Nagura-gawa, Itona, 15.x.1999, KK, L; 1 male, Ara-kawa, 55 m a.s.l., 19.iii.2016, TI , S. Iriomote-jima: 1 male, 5 females, Nishi-funatsuki-gawa, Nishi-funatsuki-bashi, 23.iii.1999, TI & AO, L; 1 female, same locality, 12.v.1999, K. Tojo, L ; 1 male, same locality, 30.x.2012, TI , P & S; 3 males, 3 females, same locality, 23.iii.2016, TI , L; 1 female, Urauchi-gawa, Kampire-no-taki, 85 m a.s.l., 30.xi.2013, TI , S; 2 males, Yuchin-gawa, 10 m a.s.l., 23.x.2015, TI , L; 1 male, same locality, 22.x.2016, TI , L.

Distribution. Japan: Ryukyu (Ishigaki-jima, Iriomote-jima). Taiwan. New to Japan.

Remarks. Cheumatopsyche clavalis was originally described based on a male from Suishako, Taiwan ( Martynov 1930). In 2018, we obtained a photograph of the holotype deposited in The Natural History Museum, London ( Figs 5H, 5I ; photographed by B. Price). According to the original description and photograph, the male is characterized as follows: Posterior margin of segment IX almost straight with low lobe on ventral half in lateral aspect; each lateral lobe of segment X round apically in lateral aspect; mesocaudal lobe of segment X very low in dorsal aspect; inferior appendages each consisting of almost straight long basal segment and short acute distal segment; and phallic apparatus curved at basal 1/3 and almost straight in apical 3/4. Kobayashi (1987) described a similar species, C. uchidai , based on a male from Wulai, Taiwan. Referring to the original description and redescription of the holotype of C. uchidai (Oláh et al. 2008) , we couldn’t find any diagnostic characters between C. clavalis and C. uchidai . Therefore, C. uchidai Kobayashi 1987 must be a junior synonym of C. clavalis Martynov 1930 . Malicky (2014) already noticed the similarity of the two species and emphasized the necessity of examination of the type specimen of C. clavalis .

The female, first described here, is separated from other congeneric Ryukyu species by the large subquadrate lateral lobes in ventral aspect ( Figs 5O, 5P ). This species has been recorded as C. uchidai in many localities of Taiwan ( Hsu 1997; Malicky 2014), and recorded here with many specimens from Ishigaki-jima and Iriomote-jima.

Japanese name. Konbô-kogata-shima-tobikera (newly given here).

Figures

FIGURE 5. Cheumatopsyche okinawa Oláh & Johansson and C. clavalis Martynov. Cheumatopsyche okinawa (5A–5G): male (5A–5E); 5A, genitalia, left lateral; 5B, same, dorsal; 5C, left inferior appendage, ventral; 5D, phallic apparatus, left lateral; 5E, apical part of phallic apparatus, ventral; female (5F, 5G): 5F, genitalia, left lateral; 5G, same, ventral. Cheumatopsyche clavalis (5H–5P): Holotype male from Taiwan, photographed by B. Price (5H, 5I): 5H, labels; 5I, genitalia, lateral; male and female from Ishigaki-jima (5J–5P): 5J, male genitalia, left lateral; 5K, same, dorsal; 5L, left inferior appendage, ventral; 5M, phallic apparatus, left lateral; 5N, apical part of phallic apparatus, ventral; 5O, female genitalia, left lateral; 5P, same, ventral. Abbreviations: IX–X = abdominal segments IX–X; l.l. = lateral lobe (paired); m.c.l. = mesocaudal lobe; p.a. = preanal appendage (paired); rec. = receptacle of inferior appendage (paired).