Homoplectra ise, Nozaki, 2019

Nozaki, Takao, 2019, Descriptions of five new species of Homoplectra Ross (Trichoptera, Hydropsychidae) from Japan with reassignment of Homoplectra tohokuensis (Kobayashi), Zootaxa 4608 (2), pp. 329-344 : 333-334

Homoplectra ise sp. nov.

( Figs. 2 , 9 )

Homoplectra sp.: Morita 2008, 92–93.

Homoplectra sp. 1.: Yamamoto & Ito 2014, 13.

Diagnosis. The male of this species is similar to that of H. crassa sp. nov. in having two pairs of posterior processes of segment X, but the male of H. ise sp. nov. is easily distinguished from H. crassa sp. nov. by the shape of the ventral process of the aedeagus: slender in H. ise , but thick in H. crassa . The female of H. ise sp. nov. can be distinguished from those of other known Japanese species by the round posteroventral projection of the segment IX.

Adult. Specimens in alcohol mostly dark brown, but antennae and legs light brown; general morphology similar to that of H. crassa sp. nov. Forewings each 7.5–9.5 mm long in male (n = 10), 8.0– 9.5 mm long in female (n = 10).

Male genitalia. Sternum IX triangular in lateral aspect, with blunt anterolateral angle of 50° on each side; posteroventral lobe divided mesally by U-shaped excision into pair of acute peaks in ventral aspect. Segment X large, bilobed, with each lobe twice as long as broad in dorsal aspect; membranous posteroventrally. Two pairs of strongly sclerotized processes arising from segment X posteroventrally, apex of each process usually with single spine surrounded by hair, but rarely with two spines. Inferior appendages long, slightly bent in apical 1/ 3 in lateral aspect; each with apex obliquely truncate in dorsal and ventral aspects, with short spine-like setae mesally. Phallotheca with rough surface near bases of dorsal processes; pair of dorsal processes finger-like in lateral aspect, with single spine surrounded by hair, each spine directed ventrolaterad; pair of lateral processes of phallotheca long, each with apex wide in lateral aspect and with single spine surrounded by hair, directed dorsad. Aedeagus with short head and with unpigmented bilobed bulge ventrally at apical 1/3; pair of lateral processes twisted near base, apex of each with single spine surrounded by hair, directed dorsolaterad; ventral process slender, bilobed usually in apical 1/5 but rarely apical 1/4, each lobe with single spine surrounded by hair apically.

Geographic variations of male genitalia. The shape and/or length of the phallic processes are variable ( Figs. 2 F– 2I).

Female genitalia. Sternites VIII close to each other mesally, mesal margins fused with segment VIII basally. Segment IX obliquely S-shaped in lateral aspect, with short round posteroventral projection. Segment X oval in lateral aspect. Vulvar scale large, posterior part membranous; vaginal chamber sclerotized posterodorsally. Vaginal apparatus pentagonal in ventral aspect, with triangular semimembranous projection anteriorly.

Immature stages. Unknown.

Holotype. Male (in alcohol). Iseji, Minamiise-cho , Mie, 34.3861°N, 136.6611°E, alt. 340 m, 18.vi–2.vii.2008, H. Morita, Malaise trap ( CBM-ZI 0167057 ).

Paratypes. 10 males, 6 females, same data as holotype ( CBM-ZI 0167058–0167073 ) .

Other specimens examined. Mie: 9 males, 6 females, same data as holotype ; 3 males, 3 females, Aoyamakogen, Okubano, Iga-shi , 19.viii.2012, H. Morita, light trap ; 3 females, same locality , 25.viii.2012, H. Morita; 3 males, headwater of Kiyodani-gawa, Myojin-daira, Iidakacho-aoda , Matsuzaka-shi , 18.vii.1998, H. Morita . Ehime: 1 male, Mt. Izugatani, Kumakogen-cho , 11–20.vii.2012, E. Yamamoto, Malaise trap ; 1 male, Mt. Kasatori, Uchikocho , 21–25.vii.2012, E. Yamamoto, Malaise trap ; 2 males, 1–10.iii.2012, E. Yamamoto, Malaise trap.

Etymology. The specific epithet refers to the traditional name of the area where the type series specimens were collected.

Distribution. Honshu (Mie), Shikoku (Ehime).

Habitat. Adults of this species were collected from a small mountain stream (50 cm wide) at the type locality by a Malaise trap ( Morita 2008).

Japanese name. Ise-nisemiyama-shima-tobikera

Figures

FIGURE 9. Distributions of Homoplectra species in Japanese main islands.

FIGURES 2–3. 2A–2L, adults of Homoplectra ise sp. nov. 2A–2E, male genitalia, type locality (Mie, Minamiise-cho): 2A, left lateral; 2B, dorsal; 2C, ventral; 2D, phallic apparatus, left lateral; 2E, same, dorsal. 2F–2I, male genitalia, variations: 2F1, segment X, left lateral, Ehime (Uchiko-cho); 2G1, apical half of phallotheca, dorsal, Mie (Iga-shi); 2G2, same, Mie (Matsuzaka-shi); 2G3, same, Ehime (Uchiko-cho); 2H1, aedeagus, dorsal, Mie (Iga-shi); 2H2, same, Mie (Matsuzaka-shi); 2H3, same, Ehime (Uchiko-cho); 2I, ventral process of aedeagus, ventral, Ehime (Uchiko-cho). 2J–2L, female genitalia, type locality: 2J, left lateral; 2K, dorsal; 2L, ventral. 3A–3F, male genitalia of Homoplectra hattorii sp. nov. type locality (Hokkaido, Ashibetsu-shi): 3A, left lateral; 3B, dorsal; 3C, ventral; 3D, phallic apparatus, left lateral; 3E, same, dorsal; 3F, aedeagus, dorsal. Abbreviations: ae. = aedeagus, d.p.a. = dorsal process of aedeagus (paired), d.p.p. = dorsal process of phallotheca (paired), end. = endotheca, i. a. = inferior appendage (paired), l.p.a = lateral process of aedeagus (paired), l.p.p, = lateral process of phallotheca (paired), ph. = phallotheca, p.p. = posterior process of segment X (paired).