Pseudoxyethira thingana ( Oláh 1989 )

Ito, Tomiko, 2017, The genus Pseudoxyethira Schmid (Trichoptera, Hydroptilidae) in Japan, Zootaxa 4319 (1), pp. 194-200 : 197

Pseudoxyethira thingana ( Oláh 1989)

( Figs. 9–14 , 19 )

Scelotrichia thingana Oláh 1989 , 267, fig. 12, male, Vietnam.

Pseudoxyethira thingana: Zhou et al. 2016 , 214–215, fig. 7, male, southern China. Scelotrichia sp.: Kuhara and Ito 2017, 16, Yakushima.

Male ( Figs. 9–14 ). Black. Length of each forewing and hind wing 1.6–1.8 mm and 1.4–1.6 mm, respectively (n = 5); androconia present. Antennae 18-segmented, 0.9 mm long (n = 5). Spur formula 0, 2, 4, without knob on fore tibia.

Genitalia. Dorsal plate very short, membranous, subquadrate. Inferior appendages long, in ventral view length 4 times maximum width; gradually narrowing in apical half, mesal edges sharply convex at apical 1/3; shape of apex variable individually, pointed, round or subquadrate. Phallus long, swollen at apical 1/4, not divided apically.

Specimens examined. Honshu. Yamanashi: 1 male, Minobu-cho, Ojiro, 960 m a.s.l., 23.viii.2009, TH. Gifu: 2 males, Fukuoka-cho, Tase, Tokokawa-dani, 6.vi.1996, T. Nozaki. Aichi: 1 male, Toyota-shi, Sanage-yama, 7.v.1999, collector unknown. Shiga: 4 males, Higashi-omi-shi, Eigenji, Kanzaki-gawa, small fall, 3.ix.2013, TI ; 8 males, same locality, 9.ix.2014, TI ; 67 males, same locality, 11.vi.2016, TI. Shimane: 8 males, Misato-cho, Nagato, Hibiki-dani, 6.viii.2001, AO. Kyushu. Nagasaki: 1 male, Korai-cho, Todoroki-kyo, 18.ix.2000, AO. Ryukyu Islands . Amami-oshima: 7 males, Yamato-son, Materia-no-taki, 25–26.x.2011, TI. Okinawa-jima: 93 males, Kunigami-son, Yona-gawa, Heigi-hashi, 10.iv.2011, TI ; 5 males, same locality, 18.iii.2014, TI ; 200 males, same locality, 18.iii.2015, TI. Ishigaki-jima: 2 males, Ara-kawa, middle reach, 19.iii.2016, TI. Iriomote-jima : 17 males, Nishi-funatsuki-gawa, Nishi-funatsuki-bashi, 30.x.2012,TI ; 33 males, same locality, 21.iii.2016, TI ; 1 male, Omija-gawa, Omija-bashi, 13.iv.2005, TI; 23 males, same locality, 22.iii.2016, TI ; 4 males, Yuchin-gawa , small fall, 23.iii.2016, TI ; 7 males, Urauchi-gawa , Kampire-no-taki, 25.iii.1999, TI & AO ; 4 males, same locality, 14.iv.2005, TI ; 2 males, same locality, 29.x.2012, TI ; 11 males, same locality, 22.iii.2016, TI.

Remarks. This species is distinguished from congeneric species by the shape of the inferior appendages and phallus: Inferior appendages with sharply convex mesal edges and apex of phallus swollen and undivided.

Distribution ( Fig. 19 ). Honshu, Kyushu, Ryukyu Islands (Yakushima, Amami-oshima, Okinawa-jima, Ishigaki-jima, Iriomote-jima), Vietnam, southern China (Jiang-xi). New to Japan.

Habitat. Adults of this species were collected near waterfalls and very fast streams with large rocks.

Japanese name. Ajia-koke-himetobikera.

Figures

FIGURE 19. Distributions of 3 species of Pseudoxyethira in Japan.

FIGURES 9 – 18. Males of 2 species of Pseudoxyethira. Pseudoxyethira thingana (Oláh) (9 – 14): 9, right antenna, right lateral; 10, genitalia, left lateral; 11, same, dorsal; 12, same, ventral; 13 and 14, apices of right inferior appendage, ventral, variation; specimens, Okinawa-jima, Kunigami-son, Yona-gawa. Pseudoxyethira funatsuki sp. nov. (15 – 18): 15, left antenna, left lateral; 16, genitalia, left lateral; 17, same, dorsal; 18, same, ventral; specimens, Iriomote-jima, Nishi-funatsuki-gawa (type locality). Abbreviations as in Figs 1 – 8.