Cheumatopsyche okinawana Oláh & Johanson, 2008

Oláh, J. & Johanson, K. A., 2008, Generic review of Hydropsychinae, with description of Schmidopsyche, new genus, 3 new genus clusters, 8 new species groups, 4 new species clades, 12 new species clusters and 62 new species from the Oriental and Afrotropical regions (Trichoptera: Hydropsychidae), Zootaxa 1802, pp. 1-248 : 181-182

Cheumatopsyche okinawana Oláh & Johanson , new species

Fig. 295–298

This dark and white speckled animal belongs to the species group having elongated, apicoventral setose lobes and elongated smooth mesocaudal lobe on segment X. The species is close to C. taipeiana Kobayashi from Taiwan, and to C. agnetae Oláh & Johanson from Hong Kong. Beside the remarkable dark and faint white speckled colour, the new species has the longer and most strongly tapering apicoventral setose lobes, making it easily distinguishable from other species with long apicoventral lobes. The ventrocaudal spiny lobe is densely covered by setae, while in C. taipeiana and C. agnetae setae are absent.

Male. Body dark brown, with dense lighter pubescence, mainly on legs and especially on second leg visible on pinned animals. Maxillary palp formula I-(III, IV)-II-V, segment V as long as sum of segments I–IV. Head dorsum dark brown, with 9 warts of lighter colour. Swollen setal wart absent on proepisternum. Setal surface present on precoxale. Pretarsal claws asymmetrical, laterally flanked by setal bundle. Mid- and hindleg claws asymmetrical.

Wings. Forewing membrane uniformly brown, with slightly darker veins and some small faint scattered maculae, largest at distal end of Sc, R, and apical cells 1, 2, and 3; maculation on menbrane correseponding to whitish speckles by small groups of white setae visible only on dry animals. Forewing crossveins m-cu and cu almost meeting in oblique line. Cu2 and A1 running separately before costa. Hind wing Sc and R meeting slightly posteriorly of crossvein r. Crossvein s located apically of crossvein r. Fork 1 absent. Forewing length 7.0 mm.

Male genitalia. Abdominal segment IX fused annularly, tergum as long as sternum ( Fig. 295). Anterior margins of segment IX regularly bow-shaped, slightly more flat dorsally in lateral aspect ( Fig. 295). Apical lobe on posterolateral margins blunt right-angled, located immediately above less sclerotized articulation cavity of gonocoxites. Spine row on posterior margins of segment IX intermittent, heterogeneous; spines on dorsolateral, spiny lobes 3 times longer than spines on apical lobes; dorsolateral spiny lobes protruding posterad into triangular projections surrounding deep, wide and concave indentation or diverticulum ( Fig. 296). Intersegmental step between segments IX and X pronounced, deep, right-angled. Segment X long, slightly curving dorsad in lateral view ( Fig. 295); with long, tapering apicoventral setose lobes and mesocaudal smooth lobe. Minute triangular tooth at basal third of dorsum visible in lateral and dorsal view ( Fig. 295, 296). Segment X regularly quadrangular in dorsal view ( Fig. 296), with narrowing apical half produced by long mesad curving apicoventral setose lobes; apex trilobed in dorsal aspect ( Fig. 296). Dorsal interlobular gap almost completely filled by mesocaudal smooth lobe. Sutures well developed on both sides of segment X; transverse, crossing segment X obliquely, reaching pair of dorsal rims. Longitudinal sutures broad, possibly forming continuation of apicoventral setose lobes, crossing transverse sutures, forming X ( Fig. 295). Smooth mesocaudal plate forming long, triangular lobe, narrow and curving dorsad ( Fig. 295). Apicoventral setose lobes long, narrowing apically; curving mesodorsad ( Fig. 295, 296); with few protuberances. Lateral setose areas (superior or preanal appendages) forming small, elevated, elongating wart, shifted distally to basis of apicoventral setose lobes and mesocaudal bare lobe. Coxopodites exceeding apex of segment X, forming slightly dorsad curving rod, without dilatation, except at apex; slightly curving mesad in ventral view ( Fig. 297). Harpagones sinuate in lateral view, with broad basal half; broader, almost straight, rod-like in ventral view ( Fig. 297). Phallotheca with nearly uniformly concave dorsum, produced by small constriction at mid-length along horizontal section. Endophallus long, running through entire phallotheca, ending in narrow tube at gonopore. Chitinized endothecal process triangular, ovoid, downwardly curving. Phallotremal sclerites half circular shaped in lateral view. Vestigial, membranous, ventral endothecal lobes weakly developed.

Holotype male: JAPAN: Okinawa, Kunigami-gun, mid Yona-gava, Yona 26 ° 45.5’N, Yona 128 ° 13.1’E, 26–29.iii.1997 [O.S. Flint, Jr.] - ( NMNH, alcohol).

Paratypes: same data as holotype - 1 male, 11 females ( NMNH, in alcohol), 1 male, 1 female ( OPC, in alcohol) .

Distribution. Japan.

Etymology. okinawana , named after the type locality, Okinawa.