Hydropsyche yathetima 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 : 134-136

Hydropsyche yathetima Oláh & Schefter , new species

Fig. 221–225

This species is similar to Hydropsyche columnata Martynov from China (Szechwan), and shares with that species a similar shape of segments IX and X, and gonocoxites. In H. yathetima the apex of the apicoventral setose processes, and the apical membranous endothecal process on the phallic apparatus, are 3-lobed, not 2- lobed; and the median keel in H. yathetima is deeply incised at apex.

Male. Body and wings brown with light pubescence. Forewing membrane light brown, with pale maculation. Sternite V with pair of lobes as long as two-thirds segment length. Maxillary palp formula I-(III, IV)-II- V, segment V shorter than sum of segments I–IV. Head dorsum brown, with 9 brown warts, anteromesal setal wart difficult to discern. Swollen setal wart present on proepisternum. Pretarsal claws asymmetrical, laterally 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 running closely. Median cell closed. Fork 1 present. Forewing length 9.3 mm.

Male genitalia. Abdominal segment IX fused annularly, laterally short without apical lobe. Median keel short and broad ( Fig. 222) dorsal and lateral surfaces granulose; deeply excised apically in dorsal view ( Fig. 222); anterior margin shallow arciform, with short ventrum, dorsum double the length of ventrum ( Fig. 221). Antecosta well developed, widening before margins. External groove of antecostal sutures present. Apical lobe on posterolateral margins robust, broad, nearly triangular ( Fig. 221). Posterior spine row intermittent, present on keel slope and apical lobes, absent between ( Fig. 221). Depression between segments IX and X shallow, stepwise. Body of segment X broadly rounded, quadrangular, dorsall margin short ventral mrgin long ( Fig. 221). Lateral setose areas (preanal appendages) located ventrally, forming compact, ovoid surfaces of light background and diffusing, scattered groups of setae, shifted distad to apical margin of segment X; digiti- form, apicoventral, setose lobe small, robust, straight, directing obliquely, forming straight dorsum together with apicodorsal setose lobes; apex trilobed in dorsal view ( Fig. 222). Dorsal interlobular gap long, wide, demarcated by apicoventral lobes; bottom slightly excising at mid-length. Apicodorsal setose lobes present at mid-lenght of dorsum, triangular, higher than median keel in lateral view ( Fig. 221); forming pair of narrowly elongate, setose ridges in dorsal view ( Fig. 222). Smooth cavity present, demarcated by longitudinal sutures. Short, wide transverse suture on each side running ventrad from bottom of intersegmental depression ( Fig. 221). Coxopodites short, robust, slightly exceeding segment X; dorsal margin sinuous; straight in ventral view ( Fig. 223). Harpagones slightly narrowing in lateral view ( Fig. 221), almost parallel-sided in ventral view ( Fig. 223). Phallic apparatus sinuate in lateral view ( Fig. 224), forming tube of almost same diameter along its length, except narrowing distally. Heavily pigmented, exposed phallotremal sclerites reniform in lateral view ( Fig. 224); twin sclerites rounded in ventral and dorsal view ( Fig. 224, 225); heart-shaped; tube narrowing, strongly constricted in ventral view, followed by sclerotized, ventral phallothecal lobe; ventral lobe widening strongly after constriction; dorsum with 3 large holes forming a triangular, filled with eversible, membranous endothecal processes armed with apical cluster of 3–4 spines immersed in eversible pockets. Dorsolateral membranous endothecal processes arising from behind phallotremal sclerites, directed laterally; each with short, stout, sinuous spine on apex.

Holotype male: INDIA: Assam, Kameng, Rupa , 26.viii.1961 [F. Schmid] - 1 male ( ROM, pinned with cleared abdomen in plastic genital vial).

Distribution. India (Assam).

Etymology. yathetima , from “yathe”, meaning 3, and “tima”, meaning aggregate 3 in Sanskrit, referring to the 3-toothed apex of the apicoventral setose lobe on segment X; and the 3-lobed membranous apical endothecal processes of the phallic apparatus.