Pseudoxyethira funatsuki, Ito, 2017

Ito, Tomiko, 2017, The genus Pseudoxyethira Schmid (Trichoptera, Hydroptilidae) in Japan, Zootaxa 4319 (1), pp. 194-200 : 197-199

Pseudoxyethira funatsuki sp. nov.

( Figs. 15–19 )

Diagnosis. The male of this species is somewhat similar to that of a Philippine species, Pseudoxyethira cayasana ( Wells & Mey 2002) , in having divided apical spines of the phallus, but is clearly distinguished from the latter in the shape of its inferior appendages; short, not exceeding segment IX, parallel-sided with smooth mesal margins and rounded apices in this species; in contrast to inferior appendages long, exceeding the dorsal plate, and with rugged mesal margins and convex apices as in P. cayasana .

Male ( Figs. 15–18 ). Black. Small, length of each forewing and hind wing 1.5–1.6 mm and 1.2–1.3 mm, respectively (n = 5); androconia present. Antennae 17-segmented, 1 st and 2nd segments larger than apical segments, 0.4 mm long (n = 5). Spur formula 0, 2, 4, without knob on each foretibia.

Genitalia. Dorsal plate very short, membranous, apical margin broadly concave. Inferior appendages parallelsided, long, with length 4 times width; rounded apically. Phallus long, bifurcated distally, apical 1/ 5 in form of slender spines; spines strongly curved ventrad, each with papilla at base.

Type series. Holotype. Male , Ryukyu Islands, Iriomote-jima, Nishi-funatsuki-gawa, Nishi-funatsuki-bashi, 24˚18’10” N, 123˚51’34” E, 10 m a.s.l., 30.x.2012, TI (CBM-ZI 164650).

Paratypes. 3 males, same data as holotype (CBM-ZI 164651–164653).

Other specimens. Ryukyu Islands. Iriomote-jima: 3 males, same data as holotype ; 2 males, type locality, 21.iii.2016, TI; 2 males, Urauchi-gawa, Kampire-no-taki, 4.iv.2005, TI; 3 males, same locality, 29.x.2012, TI ; 2 males, same locality, 22.iii.2016, TI ; 4 males, same locality, 22.x.2016, TI ; 1 male, Aira-gawa, 1.xii.2013, TI; 1 male, same locality, 21.iii.2016, TI ; 2 males, Yuchin-gawa, small fall, 23.iii.2016, TI. Ishigaki-jima: 1 male, Omoto-dake, small fall near foot path, 26.x.2012, TI.

Distribution ( Fig. 19 ). Ryukyu Islands (Iriomote-jima, Ishigaki-jima).

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

Etymology. The name “ funatuski ” is a noun in apposition, coined from the type locality.

Japanese name. Funatsuki-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.