Potamyia nuonga OLÁH & BARNARD, 2006

Oláh, J., P. C & Malicky, H., 2006, A revision of the lotic genus Potamyia BANKS 1900 (Trichoptera: Hydropsychidae) with the description of eight new species, Linzer biologische Beiträge 38 (1), pp. 739-777 : 749-750

Potamyia nuonga OLÁH & BARNARD nov.spec. (Fig. 14)

Male (in alcohol). General colour pale yellowish. Antennae 9 mm, 1.5 times length of forewing. Spur formula 044. Tarsal claws asymmetrical, covered with bristles. Forewing 5.8 mm. In forewing, crossveins M3+4-Cu1 and Cu1-Cu2 touching but not in a linear arrangement, Cu2 and A joining before C, crossveins Sc-R1 and R1-R2+3 absent, pale pterostigmal area enlarged. In hindwing stem of M plus proximal part of M3+4 almost touching and running parallel with Cu1, fork 1 present, Sc and R1 joining well before crossvein R2+3-R4.

Male genitalia. Ninth abdominal segment annular, anteriorly rounded except dorsal corner truncate, dorsum not narrowing more than ventrum, apical lobe on posterolateral margin absent, except for dorsal corner of sharp excision at base of clasper. Tenth tergum elongate and enlarged basally, subtriangular both in lateral and dorsal views, apex with small rounded excision forming a pair of upturned, recurving small projections; setose warts coalesced into an arciform transverse ridge situated at middle of tergum. Clasper moderately robust; basal segment broadening apically, apical segment long, distal half parallel-sided. Phallotheca with elongated and enlarged base; dorsum straight, but apical third lowered. Ventral surface sinuate as far as long ventral keel; lowered dorsal portion coinciding with long, well-developed ventral keel, forming geniculate, distal broadening of the phallic apparatus. Phallotremal sclerites horizontal, apparently continuation of sclerous band of endophallus. Lobules of ventral endothecal lobe small, circular, situated at typical ventrodistal position on the ventral keel. Endothecal process subreniform, occupying whole ending of the phallic aparatus.

This species is distinguished from all others in the genus by the coalesced setose warts forming an arciform transverse ridge on the middle of the tenth tergum and by the enlarged distal third of the phallic apparatus. The central position of the setose warts of preanal (superior) appendages is characteristic for the Madagascan species and is apparently a plesiomorphic character. In all other non-Madagascan species the setose warts are situated more distally and also form a more complex pattern. This interesting member of the genus is named after the tribe living around the collecting place, Nuong.

H o l o t y p e: Vietnam, Moc Chau National Reserve, 25 October 1986, at light (Oláh). P a r a t y p e: Vietnam, Bac Thai Province, Quang Chu, 24-25 May 1987, at light (Oláh). (All in J. Oláh collection).