Hydropsyche soinha 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 : 66-67

Hydropsyche soinha Oláh & Johanson , new species

Fig. 94–98

This species is similar to H. gekilara , new species from Malaysia. The holotype of H. soinha was collected in Vietnam, but a male paratype was also found at the type locality of H. gekilara . Although very similar to H. gekilara , this species is distinct. Hydropsyche soinha has shorter apical lobe of segment IX; the coxopodites are less dilated apically; and the harpagones are flat in sagittal plane, not cylindrical as in H. gekilara . Also, the ventrad curving apicoventral lobes on segment X are not undulating and their apex is not capitate in dorsal view. In the phallothecal terminalia the dorsolateral membranous endothecal process has a slender, less curving terminal spine; and the shape of the sclerotized ventral side of the phallotrema is different; the laterodistal arms are directed posterad in dorsal view, not laterad as in H. gekilara . Hydropsyche soinha has no pattern on the forewing membrane.

Male. Body and wings brown. 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 setal warts. Anteromesal setal wart disintegrated into several smaller 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 7.8 mm, hind wing length 6.0 mm.

Male genitalia. Abdominal segment IX fused annularly. Median keel unusually broad ( Fig. 95), with granulose dorsal and lateral surfaces; keel representing entire dorsum of segment IX, shifted posterad. Anterior margin arciform, ending in short ventrum and slightly longer dorsum ( Fig. 94). Antecosta well developed, forming dorsally narrowing double line, reaching almost median keel before margin ( Fig. 94); represented by well visible external groove of antecostal suture. Apical lobe on posterolateral margins short, triangular ( Fig. 94). Posterior spine row intermittent, present on keel slope and apical lobes, absent between. Depression between segments IX and X acutely angled; very short, deep; delineated by distal end of median keel and short smooth area before humps of apicodorsal setose lobes. Body of segment X rounded quadrangular in dorsal and lateral view ( Fig. 94, 95). Lateral setose areas (preanal appendages) located ventrally, forming pale, compact, ovoid patch, and setae scattered distally to distal margin of segment. Apicoventral setose lobe modified into pair of long slender processes with apical setae; in lateral view ( Fig. 94) curving ventrad, undulating; in dorsal view, almost straight; apex capitate, directed mesally. Dorsal interlobular gap widely ovoid, demarcated by apicoventral setose lobes; anterior base of gap concave. Apicodorsal setose lobe forming pair of mesal, hump-like, short, processes curving anterad, almost reaching intersegmental depression. Smooth cavity on segment X developed into slightly elongate, circular, shallow depression dominating basal half of body of segment X. Shallow cavity encircled anteroventrally by longitudinal sutures. Coxopodites exceeding apex of segment X; weakly sinuous along one-third its length, dilating slightly after mid-length in lateral and ventral view ( Fig. 94, 96). Harpagones broad, parallel-sided, weakly curving dorsad in lateral view; in ventral view ( Fig. 96) curving mesad at basal one-third. Phallic apparatus ( Fig. 97, 98) simply bent; broadening along ventrad curving basal half. Phallotheca with broad hump on ventrad curving corner, concave thereafter. Endophallus forming well pigmented, narrow tube exceeding phallic bend. Phallotremal sclerite ovoid in lateral view ( Fig. 97); triangular in dorsal view ( Fig. 98); distal end trifid in dorsal view ( Fig. 98); median branch minute; lateral branche lobes directed posterad ( Fig. 98), with rounded apex; sclerotised spine on tip of dorsolateral membranous endothecal process slender, slightly curving. Apical membranous endothecal process with pair of eversible spine sockets; pair of membranous endothecal processes developed before apex, each armed with 2 minute spines.

Holotype male: VIETNAM: Lamdong , Dalat, Monastery balcony, 18.x.1988, light [J. Oláh] ( OPC, alcohol).

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

Distribution. Vietnam and Malaysia (Perak).

Etymology. soinha , from Vietnamese “soi nho”, meaning filament, referring to the long, downwardly curving, filament-like, apicoventral setose process discovered first in this species and named accordingly.