Hydropsyche keralana Oláh & Barnard, 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 : 138-139

Hydropsyche keralana Oláh & Barnard , new species

Fig. 226–230

The species is close to H. camillus Malicky & Chantaramongkol from Thailand, Vietnam and Laos. Both species have rounded spine-window located at the proximal part of the horizontal section of the phallotheca instead of at the dorsolateral membranous lobes. Hydropsyche keralana , new species has much deeper intersegmental depression; broad, parallel-sided, capitate harpagones, not narrowing or tapering; the apicoventral lobe of the phallotheca is deeply 3-lobed in ventral view; and the forewing membrane is uniformly coloured, not light-spotted.

Male. Body and wings brown. Forewing membrane without pattern. Maxillary palp formula I-(III, IV)-II- V, segment V as long as sum of segments I–IV. Head dorsum brown, with 9 brown warts. Swollen setal wart present on proepisternum. Pretarsal claws symmetrical, without laterally flanked setal bundle. Spur formula 244. Protibiae with posteroapical spur slightly smaller than anteroapical spur.

Wings. Forewing venation typical for the genus, except median cell open in hind wings. 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 close. Median cell open. Fork 1 present. Forewing length 8.5 mm, hind wing length 7.1 mm.

Male genitalia. Abdominal segment IX fused annularly, rather long laterally. Median keel short and broad ( Fig. 227), with granulose dorsal and lateral surfaces; anterior margin deeply arciform ( Fig. 227); dorsum gradually shifted posterad; ventrum deeply arciform; ventrum short; dorsum 2 times longer than ventrum ( Fig. 226). Antecosta well developed, widening before margin. External groove of antecostal suture present. Apical lobe on posterolateral margins robust, broad, nearly triangular ( Fig. 226). Posterior spine row intermittent, present on median keel slope and apical lobes, absent between. Depression between segments IX and X narrow, deep, oblique posterad. Body of segment X nearly quadrangular ( Fig. 226), with short dorsal margin and long ventral margin ( Fig. 226); rounded in dorsal view ( Fig. 227). Lateral setose areas (preanal appendages) forming compact, ovoid surfaces of pale background centrally on segment X, and scattered, distal setae in groups, shifted to posterior margin of segment X ( Fig. 226). Digitiform apicoventral setose lobes robust, short, directed ventrad; shorter than median keel on segment IX. Dorsal interlobular gap long, wide; Vshaped, demarcated by apicoventral lobes. Apicodorsal setose lobes shifted anterad to middle of dorsum, forming narrowly separated pair of circular setose areas in dorsal view ( Fig. 227), below median keel in lateral view ( Fig. 226). Shallow, smooth cavity present, delineated ventrally by longitudinal sutures; short transverse sutures running ventrally from bottom of intersegmental depression on each side of segment X. Coxopodites short, robust, not exceeding segment X apex ( Fig. 226); ventral margin straight, dorsal margin slightly sinuous; weakly sinuous in ventral view ( Fig. 228). Harpagones broad, parallel-sided, slightly clavate in lateral and ventral view ( Fig. 226, 228). Phallic apparatus sinuate, forming tube of almost same diameter along its length ( Fig. 229); phallotremal sclerites heavily pigmented, exposed, with rounded sclerite in lateral view, double rounded twin sclerites in ventral and dorsal view ( Fig. 230); tube narrows within sclerites, constricting strongly in ventral view ( Fig. 230) followed by spine window. Eversible, membranous apical process of endotheca nested in pocket, armed with 2 clusters of medium long spines. Ventral lobe of phallotheca widening strongly after constriction, ending in 3 deeply dividing lobes in ventral view ( Fig. 230); lateral lobes as long as plate-like median lobe; dorsolateral membranous lobe shifted to middle of horizontal section of phallotheca, reduced to pair of pale, windows with a single stout spine.

Holotype male: INDIA: Kerala, Road to Lamb’s Rock, beyond Coonoor , 6000 ft. 20x.1921 [ T. B. Fletcher], Coll.Brit.Mus. 1936-643, alcohol).

Distribution. India (Kerala).

Etymology. keralana , named after the type locality.