Diplectrona burha Schmid 1961

Nozaki, Takao, 2021, The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands, Zootaxa 5082 (3), pp. 245-258 : 249-250

Diplectrona burha Schmid 1961

( Figs 2 , 7 )

Diplectrona burha Schmid 1961 , 200–201, pl. 17, male; Malicky 2002, 1205–1206, 1218, 1233, male; Ito & Nozaki 2018, 547–548, male, female.

Diagnosis. The male of this species is similar to that of D. kibuneana in the genitalic morphology but is distinguishable from that of the latter by the characters given in the diagnosis for that species.

Adult ( Figs 2A–2G ). Only one male specimen available in this study. General appearance similar to D. kibuneana , but white markings more distinct ( Fig. 2A ). On the head ( Fig. 2B ), frontal setal wart (f.s.w.) small oval; each anterior setal wart (a.s.w.) divided into 2 warts, anterior one [= vertexal lateroantennal complex setal wart of Sun (2017)] small, long oval, posterior one [= vertexal lateral compact setal wart of Sun (2017)] irregularly triangular; each posterior setal wart (p.s.w.) large oval. Forewings each 7.0 mm long, venation similar to that of D. kibuneana ( Fig. 1C ). Pair of lateral filaments (l.f.) of abdominal segment V (V) long, each about 1.3 times as long as segment V ( Fig. 2C ). Internal gland of segment V small, internal gland of segment VIII (VIII) absent ( Fig. 2C ).

Male genitalia ( Figs 2D–2G ). Segment IX (IX) triangular in lateral aspect ( Fig. 2D ). Segment X (X) with pair of mesocaudal lobes (m.c.l.), each long oval in lateral and dorsal aspects ( Figs 2D, 2E ), with stout clavate setae; pair of lateral lobes (l.l) projecting outward in dorsal aspect ( Fig. 2E ), with spine-like posterodorsal projection, ventral margin strongly sclerotized, with short setae; pair of preanal appendages large oval in lateral aspect, weakly bulging, setose. Inferior appendages (i.a.) each with basal segment long club-like, extending beyond apex of segment X ( Fig. 2D ); distal segment about 1/3 as long as basal segment, tapering to apex, curved mesad ( Fig. 2E ). Phallic apparatus narrow in middle in lateral aspect ( Fig. 2F ); with two pairs of endothecal processes (e.p.) apicodorsally, each ovate ( Fig. 2G ).

Immature stage. Unknown.

Specimens examined. Shikoku, Kochi: 1 male, Befu, Monobe-cho, Kami-shi, 27.vii.2003, M. Takai .

Distribution. Japan (Shikoku, Ryukyu islands), Pakistan, India, Nepal, Thailand, Vietnam, Taiwan.

Japanese name. Buruha-miyama-shima-tobikera.

Remarks. The single male specimen available in this study has many characteristics which agree with those of D. burha described or redescribed by Schmid (1961), Malicky (2002), and Ito & Nozaki (2018); for example, the length of the lateral filaments of abdominal segment V, the size of the internal glands of segment V, lack of internal glands of segment VIII, and the shape of the genitalia. The shape of the mesocaudal lobes and lateral lobes of the segment X are different from those of males collected from Ryukyu islands, southwestern Japan ( Ito & Nozaki 2018), but similar to those illustrated in the original description ( Schmid 1961, pl. 17, figs 7, 8). Schmid (1961) and Malicky (2002) reported variations of the male genitalia in this species.

Figures

FIGURE 1. Diplectrona kibuneana Tsuda 1940. 1A–1I, male: 1A, habitus (Kochi, photographed by M. Takai), right lateral; 1B, head, dorsal; 1C, right wings, dorsal; 1D, abdominal segments V–X, left lateral; 1E, genitalia, left lateral; 1F, same, dorsal; 1G, phallic apparatus, left lateral; 1H, same, apical part, dorsal; 1I, segment X, left lateral, type series male of Hydropsyche difficultata Kobayashi. 1J–1L, female genitalia: 1J, left lateral; 1K, dorsal; 1L, ventral. Abbreviations: a.s.w. = anterior setal wart (paired), e.p. = endothecal process (paired), f.s.w. = frontal setal wart, i.a. = inferior appendage (paired), i.g. = internal gland (paired) of segment V or VIII, m.c.l. = mesocaudal lobe of segment X (paired), l.f. = lateral filament (paired), l.l. = lateral lobe of segment VIII in female or X in male (paired), p.a. = preanal appendage of segment X (paired), p.s.w. = posterior setal wart (paired), s.r. = sclerotized rib (paired), V–X = abdominal segments V–X, v.s. = vulval scale.

FIGURE 2. Diplectrona burha Schmid 1961. 2A–2G, male: 2A, habitus (Kochi, photographed by M. Takai), right lateral; 2B, head dorsal; 2C, abdominal segments V–X, left lateral; 2D, genitalia, left lateral; 2E, same, dorsal; 2F, phallic apparatus, left lateral; 2G, same, apical part, dorsal. Abbreviations: a.s.w. = anterior setal wart (paired), e.p. = endothecal process (paired), f.s.w. = frontal setal wart, i.a. = inferior appendage (paired), i.g. = internal gland (paired) of segment V, m.c.l. = mesocaudal lobe of segment X (paired), l.f. = lateral filament (paired), l.l. = lateral lobe of segment X (paired), p.a. = preanal appendage of segment X (paired), p.s.w. = posterior setal wart (paired), V–X = abdominal segments V–X.

FIGURE 7. Distribution of Diplectrona species on the Japanese main islands.