Potamyia trenhona 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 : 753

Potamyia trenhona OLÁH & BARNARD nov.spec. (Fig. 36)

Male (in alcohol). General colour light fulvous. Antennae 11 mm, slightly less than twice length of forewing. Spur formula 144, single spur on fore-tibia small. Tarsal claws asymmetrical, covered with bristles. Forewing 6.3 mm. In forewing, crossveins M3+4- Cu1 and Cu1-Cu2 meeting in line; Cu2 and A joining well before wing margin; crossveins Sc-R1 and R1+R2+3 absent; 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 before crossvein R2+3-R4.

Male genitalia. Ninth abdominal segment annular, anteriorly straight except for dorsal corner sharply truncate; dorsum narrowing; apical lobe on posterolateral margin little developed. Tenth tergum not elongated; subpentagonal in lateral view; distal setose surface (preanal appendages) simple, upcurved; hook formation very stout, angulate, with small pointed recurving tips. Clasper slender, almost parallel-sided, slightly broadened caudally in lateral view but very bulbous in ventral view, slightly geniculate midway; apical segment blunt with small pointed mesal projection. Phallotheca with elongated and enlarged base, dorsum distally lowered, together with the broadened ventral subapical keel resulting in geniculate configuration. Phallotremal sclerite small, tapering to narrow apex, sclerous band of the endophallus larger, heavily sclerotized forming smaller dorsal and more developed ventral branch. Lobules of ventral endothecal lobe circular, located on ventral tip of keel. Endothecal process elongated.

This species is similar to P. phaidra but the spinelike process on the hook formation is small and the caudally situated setose surface much simpler; the stem of the phallic apparatus is not geniculate in P. phaidra . The species is named after the upper position of the setose surface compared to the tip of the spinelike process on the hook formation, from 'trenhon' meaning 'upper' in Vietnamese.

H o l o t y p e: Vietnam, Lamdong , Baoloc, Loc Chau, 24 October 1988, at light (Oláh) (J. Oláh collection). P a r a t y p e s 8: same data as holotype (J. Oláh collection) ; 1: N. Vietnam, Tam Dao , 14 July 1994 ( MNHU) .