Homoplectra hattorii, 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 : 334

Homoplectra hattorii sp. nov.

( Figs. 3 , 9 )

Homoplectra sp.: Ito et al. 2010, 61.

Diagnosis. The male of this species is somewhat similar to that of Homoplectra crassicornea Nozaki & Ito 2018 (in Ito & Nozaki 2018) in the shape of the phallic apparatus, but is easily distinguishable from the latter by the shape of the dorsal processes of the phallotheca in dorsal aspect: Acute, forceps-like, and bare in this species, but each a long straight finger-like process bearing an apical spine surrounded by hair in H. crassicornea .

Adult. Specimens in alcohol mostly dark brown, but antennae and legs light brown. Forewings each 6.2–7.2 mm long in male (n = 10). Venation similar to that of H. crassa sp. nov. Abdominal sternum V with pair of fingerlike processes anterolaterally, each with apex blunt.

Male genitalia. Sternum IX triangular in lateral aspect, with blunt anterolateral angle of about 40° on each side; short and setose posteroventral lobe semicircular in ventral aspect. Tergum IX trapezoidal in dorsal aspect, broadly fused with segment X laterally. Segment X setose, tall, smoothly quadrate in lateral aspect, bilobed in dorsal aspect; each lobe with small spine-like posterior process, curved dorsad. Inferior appendages long, extending far beyond apex of segment X, 1-segmented, gradually broader and truncate apically, with short spine-like setae apicomesally. Phallotheca with dorsal processes (d.p.p) forceps-like in dorsal aspect, each with lateral angle in middle and acute apex; pair of lateral processes (l.p.p.) longer than dorsal processes, blade-like in lateral aspect, each with acute apex directed dorsad. Aedeagus (ae.) slender, with short fingertip-like head; pair of dorsal processes (d.p.a.) slender, arising basodorsally, directed ventrad and then posterad, acute apices with many short fine hairs; pair of short lateral processes (l.p.a) thick and sinuous, acute apices directed dorsolaterad.

Female and immature stages. unknown.

Holotype. Male (in alcohol), Toyookanisen-zawa, Pankehoronai-gawa , Toyooka , Ashibetsu-shi , Hokkaido, 43.6079°N, 142.1306°E, alt. 370 m, 28.vi–25.vii.2013, Y. Nagasaka & A. Nagasaka, Malaise trap ( CBM-ZI 0167074 ).

Paratypes. 8 males (in alcohol), same data as holotype ( CBM-ZI 0167075–0167082 ) .

Other specimens examined. Hokkaido: 1 male, Nakanosawa-gawa, Pankehoronai-gawa, Toyooka , Ashibetsushi , alt. 465 m, 12–25.vii.2013, Y. Nagasaka & A. Nagasaka, Malaise trap ; 6 males, Penkebushunai, Sorachi-gawa, Hyakkocho-kita , Akabira-shi , alt. 430 m, 28.vi.–8.viii.2013, Y. Nagasaka & A. Nagasaka, Malaise trap ; 1 male, Apoi-dake, Samani-cho, 42.11°N, 143.00°E, 20.vii.2009, N. Kuhara (KuN).

Etymology. This species is dedicated to my friend, the late Mr. T. Hattori, who provided me much valuable information on Japanese caddisflies, including the genus Homoplectra .

Distribution. Hokkaido (central to south).

Habitat. Adults of this species were collected with Malaise traps set across small headwaters (Nagasaka and Ito, personal communication on 1.iii.2018).

Japanese name. Hattori-nisemiyama-shima-tobikera.

Remarks. In the original description of H. crassicornea ( Ito & Nozaki 2018) , the dorsal processes of the aedeagus were interpreted as the ventral processes of the aedeagus. Although the processes of H. crassicornea extend along the venter of the aedeagus, they arise from the basodorsal part of the aedeagus. They must be homologous to the processes numbered (2) by Ross (1938).

Ito et al. (2010) recorded an unidentified male of the genus Homoplectra from Hokkaido. Photographs of this male were provided by the late Mr. Hattori, including the genitalic morphology. I examined them and recognized the species as H. hattorii .

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).