Cheumatopsyche sipitanga 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 : 90-92

Cheumatopsyche sipitanga Oláh & Johanson , new species

Fig. 223–226

This species is similar to C. varius Kimmins from Sarawak, but the ventrocaudal spiny lobe on segment IX is more elongated; segment X is broader; and both apicoventral setal lobes curve laterad, not mesad in dorsal view. The harpagones are also more complex, not simple and directed mesad (in NaOH treated preparations).

Male. Body and wings pale yellow with brown pubescence. 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 slightly paler warts. Proepisternum without swollen setal wart. Protarsal claws asymmetrical, laterally flanked by setal bundle. Forewing length 5.8 mm, hind wing length 4.2 mm. Forewing crossveins mcu and cu almost tangental. Hind wing fork I absent.

Male genitalia. Segment IX fused annularly; tergum short, sternum longer ( Fig. 223); ventrocaudal spiny lobe elongating; anterior margins of segment IX regularly convex in lateral view; apical lobe on posterolateral margins nearly right-angled, located above base of coxopodites; posterior spine row interrupted, spines on dorsocaudal lobes twice as long as spines on apical lobes. Intersegmental step between segment IX and segment X shallow, obtusely angled. Segment X long, quadrangular in lateral view ( Fig. 223), widening posterad in dorsal view due to slightly laterad directed setose apicoventral lobes ( Fig. 224); clearly bilobed in dorsal view ( Fig. 224); dorsal interlobular gap wide, shallow. Sutures well developed, broad. Transverse sutures crossing at mid-length of segment X. Longitudinal sutures forming continuation of apicoventral setal lobes, meeting transverse sutures, forming pronounced, strongly sclerotised Y. Setaless mesocaudal lobe forming slightly concave plate ( Fig. 224). Apicoventral setal lobes curving slightly dorsad at apex ( Fig. 223); apices slightly rounded in dorsal view ( Fig. 224); truncate in lateral view ( Fig. 223). Pair of lateral setose areas forming small elevated warts located near apicodorsal corner above longitudinal sutures and distally of transverse sutures ( Fig. 223). Coxopodites extending very far beyond apex of segment X, forming straight cylinders without dilating apex in lateral view; curving mesad in ventral view ( Fig. 225). Harpagones short, directed mesad, in right-angle with coxopodites; slightly bilobed ( Fig. 223). Phallothecal dorsum convex ( Fig. 226); sclerotised endothecal process oval; phallotremal sclerites broad, orienting verticad in lateral view; vestigial membranous endothecal lobes slightly visible.

Holotype male: MALAYSIA: Borneo: Sabah, Sipitang, Mendolong Nersery , 5.iv.1988, light [S. Adebratt] ( NRM, in alcohol).

Paratypes: same data as holotype — 5 males ( NRM, in alcohol), 2 males ( OPC, in alcohol) .

Distribution: Malaysia (Borneo: Sabah).

Etymology: after the type locality.