Cheumatopsyche tanidai 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 : 184-185

Cheumatopsyche tanidai Oláh & Johanson , new species

Fig. 303–306

This pale fulvous medium sized species with uniformly coloured forewings, is most similar to C. infascia Martynov , a widely distributed species in the East-Palaearctic Region including Russian Far East, Korea, China and Japan. Cheumatopsyche tanidai is separated by the presence of rather elongated structural units in the genitalia. Most striking is the dorsad curving, long apicoventral setose lobes, the unusually elongate, almost process-like, preanal appendages, and the narrow and elongate sclerous endothecal process of the phallic apparatus.

Male. Body pale fulvous with paler pubescence mainly on legs, especially on the mid legs, visible in pinned specimens. Maxillary palp formula I-(III, IV)-II-V, segment V as long as sum of segments I–IV. Head dorsum dark fulvous, with 9 dark fulvous setal warts. Swollen setal wart absent on proepisternum. Setal surface present on both precoxale. Pretarsal claws asymmetrical, laterally flanked by setal bundle; claw on mid- and hind legs apparently symmetrical.

Wings. Forewing membrane evenly pale fulvous with slightly darker veins. Crossveins m-cu and cu almost tangential in oblique line. Cu2 and A1 running separately before costa. Hind wing Sc and R meeting apically of r by a distance equal to 2 times the length of crossvein r. Crossvein r almost tangential with s. Fork 1 absent. Forewing length 9.0 mm.

Male genitalia. Abdominal segment IX fused annularly, abbreviated ( Fig. 303); tergum slightly shorter than sternum. Anterior margins of segment IX regularly bow-shaped, dorsally flat in lateral aspect ( Fig. 303). Apical lobe on posterolateral margins bluntly rounded, located immediately above gonocoxites. Spine row on posterior margins of segment IX almost continuous ( Fig. 303). Spines on dorsolateral spiny lobes slightly longer than on apical lobes; in dorsal view pair of dorsolateral spiny lobes protruding triangularly, enclosing deep, wide, concave indentation or diverticulum. Intersegmental step between segments IX and X pronounced stepwise, deep, acutely angled ( Fig. 303). Segment X long, slightly curving dorsad in lateral view; with long, tapering apicoventral setose lobes and mesocaudal smooth lobe. Pair of definite, triangular rims elevating at mid-length of dorsum, visible in lateral and dorsal view ( Fig. 303, 304). Segment X regularly quadrangular in dorsal view, with slightly broadening apical half; mesally curving, long apicoventral setose lobes ( Fig. 304); clearly trilobed in dorsal aspect, smooth, mesocaudal, tongue-like lobe excised slightly mesoapically. Dorsal interlobular gap deep, narrow, almost closed by mesad curving apex of apicoventral lobes. Transverse sutures well developed, crossing segment X obliquely, reaching pair of dorsal rims. Longitudinal suture pronounced on both sides, broad, possibly forming continuation of apicoventral setose lobes; suture crossing into X. Smooth mesocaudal plate forming small, triangular lobe excising mesad in dorsal view ( Fig. 304); curving dorsad in lateral view. Apicoventral setose lobes very long, narrowing apically, curving dorsad ( Fig. 303) and mesad with aviform broadening in dorsal view( Fig. 304). Lateral setose areas (superior or preanal appendages) forming elongate processes, right-angled with longitudinal axis; shifted distally to basis of apicoventral setose lobes and mesocaudal smooth lobe. Coxopodites exceeding apex of segment X, forming straight rod with significant dilatation at apex; uniformly curving mesad in ventral view ( Fig. 305). Harpagones each with broad basis, narrowing apically, forming triangular plate with slightly dorsad curving apices in lateral view ( Fig. 303). Phallotheca with convex basal half ( Fig. 306); distal part of dorsal margin slightly concave, apex dilating. Endophallus long, filling entire phallotheca, ending in narrow tube at gonopore. Sclerous, endothecal process elongated horizontally, shallow, narrower than half phallothecal apex width. Phallotremal sclerites circular in lateral view. Vestigial, membranous, ventral endothecal lobes weakly developed.

Holotype male: JAPAN: Kyoto, 17.v.1939 [N.L. H. Krauss] - ( NMNH, pinned).

Distribution. Japan.

Etymology. tanidai , dedicated Prof. Kazumi Tanida in honour of his great effort to synthesise the knowledge on Japanese Hydropsyche .