Hydropsyche gekilara 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 : 63-64

Hydropsyche gekilara Oláh & Barnard , new species

Fig. 89–93

This species is morphologically similar to H. soinha , new species from Vietnam and North Perak in Malaysia, the latter being the type locality of H. gekilara and the 2 species have sympatric distributions. Hydropsyche gekilara and H. soinha are the only known species in the H. polyachanta clade with ventrad curving caudoventral setose processes on segment X. The other species have long apicoventral setose, digitiform processes directed straight posterad. One species, H. bonadea Malicky & Chantaramongkol from Sumatra, has a apicoventral setose processes directed dorsad at basis before curving ventrad. Although very similar to H. soinha , H. gekilara is distinct. Its apical lobe on segments IX is much longer; the coxopodites are more strongly dilating apicad; and the harpagones are cylindrical in sagittal plane, not flat as in H. soinha . The ventrad curving apicoventral lobes of segment X undulate, with more strongly capitate apex in dorsal view. There are stable differences also in the fine structure of the phallothecal terminalia. The dorsolateral membranous endothecal process has a more stout and re-curving terminal spine. The sclerotized ventral part of the phallotrema (unpaired phallotremal sclerite) has different shape; and the laterodistal arms are clearly directed laterad in dorsal view, while being directed posterad in H. soinha . Hydropsyche gekilara has small, light spots along the forewing radial forks, contrasting the brown membrane. Hydropsyche soinha has no pattern on the forewing membrane.

Male. Body and wings brown. Forewing membrane brown with light spots along radial forks. Maxillary palp formula I-II-(III, IV)-V, segment V as long as segments I–IV together. Head dorsum brown with 9 brown setal warts. Swollen setal wart present on proepisternum. Pretarsal claw asymmetrical, laterally flanked by setal bundle. Spur formula 244. Protibia 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 closely. Median cell closed. Fork 1 present. Forewing length 8.6 mm, hind wing length 6.9 mm.

Male genitalia. Abdominal segment IX fused annularly. Median keel shifted posterad, unusually broad ( Fig. 90), with granulose dorsal and lateral surfaces, representing entire dorsum of segment IX. Anterior margin arciform, dorsum about 2x longer than ventrum ( Fig. 89). Antecosta well developed, forming double line; narrowing dorsally before margin; with external groove of antecostal suture. Apical lobe on posterolateral margin long, triangular ( Fig. 89). Posterior spine row intermittent, present on keel slope and on apical lobe, absent between. Depression between segments IX and X short; delineated by distal end of keel and smooth, short, area before humps of apicodorsal setose lobes. Body of segment X rounded quadrangular in dorsal and lateral view ( Fig. 89, 90). Lateral setose areas (preanal appendages) located centrally ( Fig. 90), forming compact pale patch and setae scattered distad towards distal margin of segment X. Apicoventral setose lobe modified into 1 pair long, slender, processes with apical setae; curving ventrad ( Fig. 89); almost straight in dorsal view ( Fig. 90). Dorsal interlobular gap wide, almost quadrangular ( Fig. 90), demarcated by slender, apicoventral setose lobes; anterior basis of gap slightly concave. Apicodorsal setose lobe represented by pair of mesal, hump-like, short processes shifted anterad, almost at intersegmental depression. Smooth cavity on segment present, developed into obliquely elongating, shallow depression dominating basal half of segment X. Longitudinal sutures encircling shallow cavity anteroventrally. Coxopodites exceeding apex of segment X ( Fig. 89); weakly sinuous at basal half, dilating after mid-length ( Fig. 89, 91). Harpagones broad, parallel-sided, slightly curving dorsad in lateral view ( Fig. 89), straight and cylindrical in ventral view ( Fig. 91). Phallic apparatus ( Fig. 92, 93) simply bent, broadening along downwardly curving basal part. Phallotheca with concave dorsum. Endophallus forming well pigmented, narrow tube, exceeding point of phallic bending. Phallotremal sclerite ovoid in lateral view, triangular in dorsal view ( Fig. 93); distal end trifid in dorsal view; median branch minute; lateral branches directed laterad, slightly tapering. Sclerotized spine on tip of dorsolateral membranous endothecal process stout, curving claw-like. Apical membranous endothecal process with pair of eversible sockets with 5–6 spines ( Fig. 92, 93). Pair of membranous endothecal processes present before apex, each armed with 2 minute spines ( Fig. 93).

Holotype male: MALAYSIA, North Perak, Belum Expedition , i.1994, Rothamsted light trap 1 [M. Erle] — ( NHML, in alcohol).

Distribution. Malaysia (Perak).

Etymology. gekilara , from Sanskrit “gekilara”, meaning cylindrical, referring to the cylindrical harpago.