Potamyia assamana Oláh & Schefter, 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 : 230

Potamyia assamana Oláh & Schefter , new species

Fig. 384 – 387

This species is similar to P. daphne Malicky described from Kerala, and later recorded from Karnataka and Tamil Nadu ( Oláh et al. 2006a). It differs from P. daphne in the straight, not rounded anterior margins of segment IX; longer segment X; U-shaped, dorsal interlobular gap; phallotheca with straight, not undulating dorsum; and very large sub-apical ventral lobes.

Male. Body and wings light brown, with brown pubescence. Forewing membrane without maculation. Antennae less than twice as long as forewings. Abdominal segment V with minute, pointed, lobes. Spur formula 144. Protibiae with small spur. Pretarsal claws asymmetrical, laterally flanked by setal bundle. Mid- and hind-leg claws asymmetrical.

Wings. Forewing crossveins m-cu and cu running closely. Cu2 and A joining before wing margin. Hind wing stem of M plus proximal part of M3+4 almost tangential, running parallel with Cu1. Fork 1 present. Forewing 8.0 mm.

Male genitalia. Abdominal segment IX fused annularly, short; tergum half as long as sternum ( Fig. 384). Anterior margins of segment IX straight, with posteriorly shifted dorsal section in lateral aspect ( Fig. 384). Apical lobe on posterolateral margins small, almost absent, located immediately above narrow articulation cavity of gonocoxites ( Fig. 384). Spine row on posterior margins of segment IX almost complete, not intermittent, with short gaps; spine lengths heterogenous; spines on laterocaudal protuberances of dorsum about 2 times longer than spines on posterior margina of segment IX; spines on apical lobes stiff, very densely set ( Fig. 384). Intersegmental step between segments IX and X deep, partly occupied by pair of setose protuberances; appearing as setose laterocaudal lobes. Body of segment X long, with ventrad curving distal half ending in dorsad curving hook in lateral aspect ( Fig. 384); bilobed in dorsal aspect ( Fig. 385); ventrum bellied; curving apicoventral spiny hook dominating distal part ( Fig. 384). Smooth mesal lobe reduced; dorsal interlobular gap U-shaped, wide, deep to mid-length of apex ( Fig. 385). Dorsad curving apex of spiny hooks separated by dorsal interlobular gap, forming pair of birdbeak-shaped processes armed with mesad directed, stiff setae; shape highly dependent on observation angle. Setose area present on basal dorsolateral areas of segment X; process between segment IX and X absent. Pair of well-developed protuberances representing laterocaudal lobes present. Transverse and longitudinal sutures invisible. Pair of setose areas (superior or preanal appendages) circular, located at mid-length abouve ventral margin ( Fig. 384), or representing setose dorsal ridge possibly homolog with vestigial dorsal setose lobes. Coxopodites significaltly strongly exceeding apex of segment X; rod-shaped, slightly broadening apicad from mid-length; slightly bending ventrad; uniformly curving mesad in ventral view ( Fig. 386). Harpagones short, broad, tapering along their lengths in lateral view ( Fig. 384); broader, pointing mesad in ventral view ( Fig. 386). Phallotheca with enlarged phallobase ( Fig. 387); straight horizontal shaft with regular straight dorsum; ventral subapical broadening strongly enlarged. Endophallus forming narrow tube at gonopore near bottom of phallobase. Chitinized endothecal process small, circular. Phallotremmal sclerites broad; vertical ( Fig. 387).

Holotype male: INDIA: Assam, Kameng, Salary , 9.vii.1961 [F. Schmid] - ( ROM, pinned).

Etymology. assamana , named after the type locality, Assam.