Potamyia tofina 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 : 747

Potamyia tofina OLÁH & BARNARD nov.spec. (Fig. 6)

Male (in alcohol). General colour fuscous. Antennae 19 mm, less than twice length of forewing. Spur formula 044. Tarsal claws asymmetrical, outer one covered by bunch of black bristles. Forewing 12 mm. Crossveins M3+4-Cul and Cu1-Cu2 not touching, crossvein Cu1-Cu2 twice its own length basad of M3+4-Cu1. Cu2 and A joining before C, crossveins Sc-R1 and R1-R2+3 absent, pterostigmal area enlarged and heavily granulated. In hindwing stem of M plus proximal part of M3+4 running close to and parallel with Cu1, fork 1 present, Sc and R1 joining well before the crossvein closing discoidal cell (R2+3-R4).

Male genitalia. Ninth abdominal segment annular, anteriorly rounded in lateral view with narrowing dorsum and excised lateroventral corner; dorsum extremely narrow without visible median keel. Apical lobe on posterolateral margin rounded, subtriangular, covering half base of clasper. Tenth tergum elongated horizontally with triangularly excised bifid and scarcely upcurved apex; extreme tip short, stout and more sclerotized. Setose warts flat, not elevated, medially located, well separated. Clasper with basal segment robust, proximal third narrow and widening apically. Apical segment short and bifid, its upper lobe more developed. Phallotheca with elongated and enlarged base, dorsum straight in lateral view, caudal portion upcurved and projecting distally; articulation of endothecal process oblique. Ventral surface with regular sinus; subapical ventral keel long, not strongly sclerotized. Phallotremal sclerite well developed and rounded in both lateral and dorsal views. Sclerous band of endophallus not clearly visible. Two pairs of lobules (ventral endothecal process), one at distal end of subapical ventral keel as usual for the genus, the other at middle of keel. Endothecal process forming caudal lips of phallic apparatus semicircular, articulation plane not vertical but oblique, covering most of caudal end of phallic apparatus.

This species can be distinguished from P. andria , the other species having a bifid caudal clasper segment, by the robust clasper, flattened setose warts, straight phallic dorsum, much longer ventral keel and the additional subapical lobules of the ventral endothecal lobe. There are many differences in wing venation as described, and the size is more than double that of P. andria . This species is named from part of the type locality.

H o l o t y p e: Madagascar, District Fiananantsoa , Ambatofinandranhnana, July 1957 (Paulian) ; 3 p a r a t y p e s, same data as holotype. (All in J. Oláh collection) .