Cheumatopsyche imatso 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 : 110

Cheumatopsyche imatso Oláh & Johanson , new species

Fig. 267–270

This species is similar to C. andohahela , new species from which it is easily distinguished in the harpagones that have upper branches located more centrally, easily seen in lateral view. In addition, the central part of the phallotheca is straight, not arching. This is also a very large and dark species.

Male. Body and wings brown with brown pubescence; wing 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 brown with 7 similarly coloured warts. Antennae about 1.5 times longer than forewings. Proepisternum without swollen setal wart. Protarsal claws asymmetrical, laterally flanked by setal bundle. Forewing length 13.2 mm, hind wing length 9.8 mm. Forewing crossveins m-cu and cu almost tangental. Hind wing fork I present.

Male genitalia. Segment IX fused annularly, sternum longer than tergum ( Fig. 267); anterior margins of segment IX rounded; apical lobe on posterolateral margins broad, located above and partly covering base of coxopodites ( Fig. 267); spine row on posterior margins of segment IX complete; spines long, irregularly bent on dorsum, shorter and straight on apical lobe. Intersegmental step between segment IX and segment X occupied by pair of setose protuberances ( Fig. 267). Segment X long, nearly rectangular ( Fig. 267 in dorsal view simple, with about parallel lateral margins ( Fig. 268). Apicoventral setal lobes completely fused to segment X, directed dorsad along their length, broad with rounded apices ( Fig. 267). Setaless mesocaudal lobe reduced ( Fig. 268). Dorsal interlobular gap narrow, deep ( Fig. 268). Pair of small, setose protuberances present dorsobasally on segment X, visible in lateral and dorsal view ( Fig. 267, 268). Transverse sutures visible behind both lateral setose areas, near base of segment X. Longitudinal sutures present along ventral margin of segment X ( Fig. 267). Lateral setose areas forming pair of elevated, vertically elongated warts, located centrally on segment X. Coxopodites robust, gradually broadening from before mid-length, exceeding apex of segment X. Harpagones with bilobed apices ( Fig. 269); both dorsal branches originate from central part in lateral view ( Fig. 267); lower branches visible only in ventral view ( Fig. 269), widely rounded, covered by short, stout setae. Phallothecal phallobase small, horizontal part straight; sclerotised endothecal process circular; phallotremal sclerites broad, rounded in lateral view.

Holotype male: MADAGASCAR: Vakoana , Foret, Imatso, 1550 m, 22.i.1958 [R. Paulian] ( MNHN, in alcohol).

Distribution: Madagascar.

Etymology: from the name of the type locality.