Hydropsyche narayana 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 : 74-76

Hydropsyche narayana Oláh & Johanson , new species

Fig. 113–117

This species is morphologically similar to H. astyanax Malicky & Chantaramongkol 2000 from Kerala in India. The new species is distinguished from H. astyanax by the sharply triangular apical lobe on the posterior margins of segment IX, not apically rounded; and the median keel is straight in lateral view, not concave with right-angled anterior and posterior corners. In addition, the apicoventral setose processes are shorter and curving ventrad, not long and nearly straight as in H. astyanax ; the dorsal interlobular gap on segment X is wider with more rounded anterior base, not V-shaped; in the phallic apparatus, the falciform sclerotized spine of the dorsolateral, membranous endothecal process has a straight, proximal half being narrower than its distal claw; the basis of the phallotremal tongue is straight and flat, not oblique; and the distal elongation of the phallotremal tongue is more slender.

Male. Body and wings dark brown with light pubescence. Forewing membrane uniformly brown, without pattern. Maxillary palp formula I-II-(III, IV)-V, segment V as long as segments I–IV together. Head dorsum brown with 9 brown warts. Swollen setal wart present on proepisternum. Pretarsal claws asymmetrical, later- ally flanked by setal bundle. Spur formula 244. Protibiae with posteroapical spur smaller than anteroapical spur.

Wings. Venation typical for the genus. Forewing crossveins m-cu and cu separate. Sc and R, and Cu2 and A separate before costa. Hind wing Sc and R meeting before costa about at crossvein r. Stem of M and Cu1 situated close. Median cell closed. Fork 1 present. Forewing length 9.0 mm, hind wing length 7.0 mm.

Male genitalia. Abdominal segment IX fused annularly, short. Median keel unusually broad ( Fig. 114); dorsal surface granulose; lateral surface smooth glabrous; keel forming entire dorsum of segment IX, shifted posterad ( Fig. 113, 114); anterior margin arciform, ventrum short, dorsum long ( Fig. 113). Antecostae well developed, each forming double line narrowing dorsally before margin, external groove present on antecostal sutures. Apical lobe on posterolateral margins of segment IX long, acutely triangular ( Fig. 113). Posterior spine row intermittent, present on lower part of median keel slope and on apical lobes, absent between. Depression between segments IX and X short, deep ( Fig. 113); delineated by distal end of median keel and vertical, apicodorsal setose processes. Body of segment X short, triangular in lateral view ( Fig. 113); rounded quadrangular in dorsal view ( Fig. 114). Lateral setose areas (preanal appendages) located distally, forming compact patches of light background and scattered, distal setae. Apicoventral setose lobes modified into pair of long, slender processes with apical setae; curving ventrad in lateral view ( Fig. 113); in dorsal view ( Fig. 114) curving mesad, mesally tangential. Dorsal interlobular gap wide, almost circular ( Fig. 114); surrounded by apicoventral setose lobes; anterior margin of gap rounded. Apicodorsal setose lobes forming pair of mesal, finger-like short processes; vertical part regular, shifted anterad to short, deep intersegmental depression. Smooth cavity large, shallow, dominating basal half of segment X. Longitudinal sutures ventrally encircling smooth cavity. Coxopodites not exceeding apex of segment X; dorsal margin weakly sinuous basally, dilating distally from mid-length ( Fig. 113); slightly curving mesad in ventral view ( Fig. 115). Harpagones broad at basis, distal two-thirds filiform, straight in lateral view ( Fig. 113); sigmoid in ventral view ( Fig. 115). Phallic apparatus simply bent, broadening along ventrad curving basal section ( Fig. 116). Phallotheca with slightly concave dorsal margin ( Fig. 116). Endophallus forming well-pigmented, narrow tube, reaching over phallic apparatus bend ( Fig. 116). Basis of phallotremal tongue straight, flat in lateral view ( Fig. 116); distal part more slender than each membranous apical lobes of endotheca ( Fig. 117). Falciform sclerotized spine of dorsolateral membranous endothecal process with straight proximal half, narrower than distal claw ( Fig. 116, 117).

Holotype male: INDIA: Orissa State, Chilika Lake, Narayana Valley , 21.ii.1987, singled [J. Oláh] ( OPC, alcohol).

Distribution. India (Orissa).

Etymology. narayana , named after the type locality, the small Narayana Valley of shrine in the low hills near Chilika Lake, where this single animal was collected by sweeping net along the very small stream surrounded by crowd of pilgrims.