Homoplectra trifurcata Nozaki and Ito, 2018

Ito, Tomiko & Nozaki, Takao, 2018, The family Hydropsychidae Curtis (Trichoptera) in the Ryukyu Archipelago, southwestern Japan, Zootaxa 4504 (4), pp. 545-565 : 553

Homoplectra trifurcata Nozaki and Ito sp. nov.

( Figs 4 J–4Q)

Diagnosis. The male of this species can be readily diagnosed by the unique trifurcated aedeagus from the congeneric members. The female of this species is distinguishable from that of H. crassicornea sp. nov. by the difference given in the diagnosis for that species.

Adult ( Figs 4 J–4Q). Body and forewings mostly brown in alcohol. Forewings each 7.2–8.1 mm long in male (n = 10), 7.3–8.7 mm long in female (n = 10). Venation as in Fig. 4A . Abdominal sternite V with pair of long finger-like processes near anterolateral margins.

Male genitalia ( Figs 4 J–4N). Sternite IX oblique trapezoid in lateral aspect; posteroventral lobe small, semicircular in ventral aspect. Tergite IX mostly fused with segment X. Segment X large oval in lateral aspect, with short central slit apicodorsally in dorsal aspect; pair of spine-like processes arising posteroventally, directed dorsad; membranous posteroventrally. Inferior appendages long, 1-segmented, extending slightly beyond apex of segment X, each apex with short spine-like setae mesally. Phallic apparatus large, arcuate in lateral aspect; dorsal process of phallotheca (d.p.p) about half length of aedeagus, triangular in dorsal aspect, bilobed apically, each apex acute; pair of lateral processes of phallotheca (l.p.p.) long, each apex acute. Aedeagus (ae.) trifurcated apically, pair of lateral lobes (probably fused ventral process of aedeagus) sinuate in lateral aspect, each apex truncate, directed dorsolaterad; dorsolateral processes of aedeagus (d.p.a) paired, long, spine-like.

Female genitalia ( Figs 4 O–4Q). Sternite VIII cleft about half distance from base, forming pair of lateral lobes, each with posterodorsal corner producing into acute angle in lateral aspect. Segment IX obliquely S-shaped in lateral aspect, round in dorsal aspect. Segment X rectangular in lateral aspect, with dark pigmented ventrolaterally, constriction between segments IX and X wide. Vulvar scale large, with hourglass-shaped marking in ventral aspect.

Holotype. Male, Amami-o-shima, Uken-son, Yuwan -gawa, 28.2952N, 129.3170E, 600 m a.s.l., 4.v.2008, TI, S ( CBM-ZI 166074 ).

Paratypes. 14 males, 5 females, same data as holotype ( CBM-ZI 166075–166088 , 167020–167024 ) .

Other specimens examined. 8 females, same data as holotype ; 2 males, 5 females, type locality, 8–9.v.2007, TI , S & L; 4 males, type locality, 20–21.iv.2008, TI , S.

Etymology. Specific name (Latin adjective) refers to the trifurcated processes of the phallic apparatus.

Distribution. Japan: Ryukyu (Amami-o-shima).

Japanese name. Mitsumata-nisemiyama-shima-tobikera.

Figures

FIGURE 4. Homoplectra crassicornea Nozaki & Ito sp. nov. and H. trifurcata Nozaki & Ito sp. nov. Homoplectra crassicornea (4A–4I): male (4A–4F): 4A, right wings, dorsal; 4B, genitalia, left lateral; 4C, same, dorsal; 4D, same, ventral; 4E, phallic apparatus, left lateral; 4F, same, dorsal; female (4G–4I): 4G, genitalia, left lateral; 4H, same, dorsal; 4I, same, ventral. Homoplectra trifurcata (4J–4Q): male (4J–4N): 4J, genitalia, left lateral; 4K, same, dorsal; 4L, same, ventral; 4M, phallic apparatus, left lateral; 4N, same, dorsal; female (4O–4Q): 4O, genitalia, left lateral; 4P, same, dorsal; 4Q, same, ventral. Abbreviations: I–V = apical forks I–V; VIII–X = abdominal segments VIII–X; sIX = sternite IX; ae. = aedeagus; d.p.a. = dorsolateral process of aedeagus (paired); d.p.p. = dorsal process of phallotheca (paired); end. = endotheca; l.p.p. = lateral process of phallotheca (paired); pha, phallotheca; v.p.a. = ventral process of aedeagus (paired).