Hydromanicus sacso 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 : 36-39

Hydromanicus sacso Oláh & Johanson , new species

Fig. 51–54

This colourful animal resembles Hydromanicus abiud Malicky & Chantaramongkol, 1993 from Thailand. The new species is separated from H. abiud in the completely different shape of the lateral part of segment IX; its apical lobe of segment IX being shifted ventrally to the articulation of the gonocoxite and being sharply triangular, while being rounded and located at mid-height of segment in H. abiud . Hydromanicus sacso has differently shaped bi-lobed harpagones; and the dorsal interlobular gap on segment X is shallower.

Male. Body and wings brown. Forewing membrane brown with rounded, light-patched pattern scattered irregularly and of various size; pattern emphasized by colour of setae, less visible on denuded membrane. Sternum V with pair of small, posterad protuberances connected to elongated, internal granulous sac constricted at mid-length and continuing anterad to middle of segment IV. Maxillary palp segment formula I-III- (II-IV)-V, segment V very thin, slender, almost 2 times longer than length of I–IV together. Maxillary palp unusually long, reaching third abdominal segment. Head dorsum chestnut brown, with 5 bright yellow setal warts. Swollen setal wart absent on proepisternum. Small setal wart present on precoxale (proepisternum). Pretarsal claws asymmetrical, laterally flanked by setal bundle. Spur formula 244. Protibial posteroapical spur smaller than anteroapical spur.

Wings. Venation typical for the genus. Forewing crossveins m-cu and cu separate. Sc and R separate at costa. Cu2 and A fusing at wing margin. Hind wing Sc and R fusing before costa near crossvein s. Stem of M and Cu1 separate. False vein of convolution present along stem of Cu1. Median cell open. Fork 1 present. Forewing length 10 mm, hind wing length 7.2 mm.

Male genitalia. Abdominal segment IX fused annularly, short. Median keel very short, broad ( Fig. 52); dorsally and laterally granulose; anterior margin shallowly arciform; dorsum more flat; ventrum sinuous in lateral view. Antecosta forming single line narrowing gradually dorsally before margin; ventrally broad with external groove of antecostal suture. Apical lobe on posterolateral margins sharply triangular ( Fig. 51), located immediately above articulation of gonocoxites. Posterior spine rows intermittent, present on each triangular apical lobe and on slope of broad, median keel, and centrally at lower half of segment X; heterogeneous; setae on slope of median keel extremely long, stout; setae on apical lobes about one-fourth as long as setae on median keel. Depression between segments IX and X deep, stepwise, with rounded step corner. Body of segment X long, triangular, apex bluntly rounded in lateral view ( Fig. 51); narrow, parallel-sided in dorsal view ( Fig. 52); anterodorsad orienting spiny hook present on centre of dorsum, easily seen in lateral view ( Fig. 51). Preanal appendages forming large, filiform plate covered with setae nested in elevated alveoli. Apicoventral setose lobes modified into pair of short, digitiform and slightly capitate processes ( Fig. 52); bluntly broad in lateral view ( Fig. 51). Dorsal interlobular gap shallow, narrow, demarcated by apicoventral digitiform processes. Apicodorsal setose lobe reduced to setose surface merging with setose surface of apicoventral lobes. Smooth cavity on segment X absent. Transverse sutures running obliquely across segment X, visible in lateral and dorsal view; demarcating dorsal hook. Coxopodites slightly exceeding apex of segment X, stout; nearly straight along their lengths and gradually broadening apically in lateral view ( Fig. 51); curving mesad in ventral view ( Fig. 53). Harpagones bi-lobed, digitiform; each ventral lobe larger than dorsal lobes ( Fig. 51). Phallic apparatus ( Fig. 54) bent smoothly; basis curving ventrad, almost right-angled. Anterior part of horizontal phallotheca almost as broad as ventrad curving section; narrowing gradually before apex. Distal part of phallotheca ending in elongated sclerous endothecal process; dorsum straight; apex curving ventrad; pair of semicircular phallotremal sclerites located centrally, partly covered by sclerous endothecal process and partly embedded in ventral membranous endothecal process. Endophallus of same shape as phallotheca, ending anteriorly in narrow, ventrad curving tube with gonopore.

Holotype male: VIETNAM: Lamdong , Baoloc, Duchma stream, waterfall, 22.x.1988, singled [J. Oláh] ( OPC, alcohol).

Paratype: same data as holotype - 1 female ( OPC, alcohol) .

Distribution. Vietnam.

Etymology. sacso , from Vietnamese “sac so”, meaning colourful, referring to the colourful forewing pattern.

Remarks. The male pretarsal claw is asymmetrical with laterally flanked setal bundle. The female has symmetrical pretarsal claws without setal bundle.