Ugandatrichia taiwanensis Hsu and Chen, 2002

Ito, Tomiko & Ohkawa, Ayuko, 2012, The genus Ugandatrichia Mosely (Trichoptera, Hydroptilidae) in Japan, Zootaxa 3394, pp. 48-58 : 54-57

Ugandatrichia taiwanensis Hsu and Chen, 2002

( Figs. 5 , 6 B)

Ugandatrichia taiwanensis Hsu and Chen, 2002 , 74–79, male, female, pupa, larva, case, habitat, Taiwan.

Adult. Wings black, densely covered with long black hairs, lines of dense scales on some veins especially at base of male forewings. Antennae black at basal 1/3 and white at apical 2/3.

Male ( Fig. 5 ). Length of forewing, hind wing and body 3.6 mm, 3.2 mm and 3.1–3.5 mm, respectively. Forewings each with apical forks II and III, hind wings each with apical forks II, III and V. Antennae each 31–32-segmented and 1.6 mm long.

Genitalia ( Fig. 5 ). Segment IX large, round in lateral view, subquadrate in dorsal view. Dorsal plate membranous; wide, round postero-laterally in dorsal view, in lateral view hump-like. Subgenital plate distinctly longer than dorsal plate, broad-based, tapered to narrow apex, directed ventrad apically, with pair of setae subapically. Inferior appendages stout, large, twice as long as subgenital plate, setose; in lateral view slightly thickened at middle, tapered distally, somewhat rounded apically; in ventral view parallel sided with round apices; each with two spurlike processes near middle of dorso-mesal margin. Paired sclerotized processes above inferior appendages, triangular in lateral view, semi-circular in dorsal view. Phallus long, titillator curled once at about 2/3 from base, ejaculatory duct slightly projecting.

Female ( Fig. 5 ). Length of forewing, hind wing and body 4.1 mm, 3.3 mm and 3.2–3.8 mm, respectively. Forewings each with apical forks II and III; hind wings each with forks II, III and V, crossvein R+M sometimes absent. Antennae each 32-segmented and 1.6 mm long.

Segment VII: Tergite and sternite fused laterally, weakly sclerotized; tergite subquadrate with row of numerous very long setae near posterior margin; in ventral view, sternite straight anteriorly, slightly convex laterally, with middle large subtriangular projection and dense setal band posteriorly. Segment VIII almost as long as segment VII, with middle excision and 4 pairs of long setae posteriorly.

Pupa, larva and case. Very similar to those of U. nakijinensis sp. nov.; no distinguishing features discernible.

Specimens examined. Japan, Okinawa, Iriomote-jima. 31 males, 11 females, 2 pupae, 91 larvae, Urauchigawa, Kampira-no-taki, 25.iii.1999, TI & AO, sweep & pick up; 5 males, 5 females, 10 pupae, 18 prepupae, 8 larvae, ibid., 25.iii.1999 (larvae), reared & emerged (or preserved) in iv.1999, TI & AO; 13 males, 21 females, ibid., 14.iv.2005, TI, S; 2 males, Mihara, 21.iii.1996, F. Nishimoto; 1 pupa, 1 larva, Nishi-funatsuki-gawa, Nishi-funatsuki-bashi, 23.iii.1999, TI & AO, S. Japan, Okinawa, Ishigaki-jima. 2 males, 5 females, Mt. Omoto-dake, small fall near foot path, 13.iv.2011, TI, S.

Remarks. Specimens of this species collected from Iriomote-jima and Ishigaki-jima coincide almost completely with those of the original description of this species ( Hsu & Chen, 2002). A small difference is seen in the forewing venation of males: R1 joins to R 2 in the Taiwanese specimens but R1 joins to Sc in the Japanese specimens. The venation may be different locally in this species as in U. nakijinensis sp. nov.

Ugandatrichia taiwanensis is similar to U. nakijinensis as described in remarks of the latter, but adults of the 2 species are clearly distinguished as follows: In the male, androconia on forewings, round lateral humps of the dorsal plate, and a dorso-mesal second spur of each inferior appendage are present in U. nakijinensis but absent in U. taiwanensis ; in the female, the posterior margin of sternite VII is smoothly rounded in U. nakijinensis , but largely convex in U. taiwanensis . Pupae and larvae of the 2 species are very similar and could not be distinguished from each other.

Ten caddisfly species are known from both Taiwan and the southernmost part of Japan: Rhyacophila formosana Ulmer ( Kuranishi 1997) , Hydroptila thuna Oláh ( Ito et al. 2011) , Ecnomus tenellus Ramber ( Shimura 2010) , Tinodes higashiyamanus Tsuda ( Shimura 2010) , Micrasema hanasense Tsuda ( Shimura 2010) , Lepidostoma ebenacanthus Ito (Ito 1992) , Lepidostoma doligung (Malicky) ( Shimura 2010) , Adicella makaria Malicky & Chantaramongkol ( Shimura 2010) , Oecetis spatula Chen ( Shimura 2010) and Anisocentropus kawamurai (Iwata) (Ito et al. 2012) . This is the eleventh caddisfly species in common between Japan and Taiwan.

Distribution ( Fig. 6 B). Japan (Iriomote-jima, Ishigaki-jima), Taiwan. New to Japan.

Habitat. Larvae of this species also live on rocky substrates on waterfalls and in very fast flowing waters.

Japanese name. Taiwan-ô-hime-tobikera (newly given here).

Figures

FIGURE 5. Ugandatrichia taiwanensis. Male (A – G, Iriomote-jima, Kampira-no-taki): A, right wings, dorsal; B, genitalia, left lateral; C, same, dorsal; D, same, ventral; E, distal part of subgenital plate, dorsal; F, phallus, right lateral; G, same, dorsal. Female (H – K; I, Ishigaki-jima, Omoto-dake; others, Iriomote-jima, Kampira-no-taki): H, I, right wings, dorsal; J, segments VII – X, left lateral; K, same, ventral. Abbreviations: 2 – 5, 2 nd – 5 th apical forks.

FIGURE 6. Habitat and distribution. A, A typical stream habitat of Ugandatrichia nakijinensis, with 3 sites where larvae and pupae were found indicated by circles (type locality); B, distribution of the 2 species.