Cheumatopsyche usambara Oláh & Johanson, 2008

Oláh, János, Johanson, Kjell Arne & Barnard, Peter C., 2008, Revision of the Oriental and Afrotropical species of Cheumatopsyche Wallengren (Hydropsychidae, Trichoptera), Zootaxa 1738, pp. 1-171 : 104

Cheumatopsyche usambara Oláh & Johanson , new species

Fig. 253–256

This species is similar to C. maculata Mosely from South Africa, from which it is separated by the presence of a ventrocaudal spiny lobe on segment IX bearing stout and stiff spines. Furthermore, segment X is more quadrangular in lateral view; its apicoventral setal lobes lack the small processes at the inner apical corner that are present in C. maculata ; and the harpagones are digitiform, not conical.

Male. Body and wings brown with brown pubescence; wing membrane unicolorous without spots or pattern. Maxillary palp segment I shortest, segment II longer, segments III and IV equally long, segment V as long as sum of segments I–IV. Head dorsum dark brown with 7 similarly coloured warts. Proepisternum without swollen setal wart. Each protibiae with 2 spurs. Protarsal claws asymmetrical, laterally flanked by setal bundle. Forewing length 6.2 mm, hind wing length 5 mm. Hind wing fork I absent.

Male genitalia. Segment IX fused annularly; tergum short, sternum about 3 times longer than tergum ( Fig. 253); ventrocaudal spiny lobe with weakly developed spines; anterior margins of segment IX regularly convex; apical lobe on posterolateral margins right-angled, triangular, short, broad, located at mid-height on segment; spine row on posterior margin complete. Intersegmental step between segment IX and segment X deep, right-angled. Segment X subquadrangular in lateral view ( Fig. 253), with fused, delineated, posterad orienting apicoventral setal lobes ( Fig. 253). Apicoventral setal lobes broad, rounded in dorsal view ( Fig. 254); surrounding narrow, dorsal interlobular gap. Lateral interlobular gaps absent. Setaless mesocaudal lobe small; apical margin nearly straight. Lateral setose areas forming pair of elevated, slightly elongated warts located at mid-length and slightly dorsally on segment X ( Fig. 253), distad of transverse sutures. Transverse sutures pronounced, running obliquely ( Fig. 254). Strongly sclerotised longitudinal sutures delineating fused apicoventral lobes in lateral view (not illustrated). Coxopodites robust; angled posterodorsad at basal one-fifth their lengths ( Fig. 253); slightly broadening from angling point, exceeding apex of segment X; bases capitate, apices dilating in ventral view ( Fig. 255). Harpagones forming dorsad curving processes in lateral view; about one-third as broad as coxopodite apices ( Fig. 253); digitiform, slightly S-shaped in ventral view ( Fig. 255). Phallotheca ( Fig. 256) slender, narrowing towards mid-length before broadening towards apex; ventral keel present at distal one-third; sclerotised endothecal process almost circular, somewhat broader than apex of phallotheca; phallotremal sclerites small, long, vertical; vestigial ventral endothecal membranous lobe not visible.

Holotype male: TANZANIA: Sigi River , Amani, E. Usambara Mts., 2500 m, 21.ii.1959 [M.T. Gillies] ( OPC, in alcohol).

Distribution: Tanzania.

Etymology: from the type locality.