Rhyacophila retracta, Martynov, 1914

Rhyacophila retracta View in CoL Species Group

Rhyacophila retracta View in CoL Species Group Ross 1956, 102–103; Schmid 1970, 89–90, 132; Emoto 1979, 556–560; Hattori 2005, 422, 431.

The males of this species group share the following characters: Segment IX is short ventrally and the long dorsal part bears a large apicodorsal lobe; preanal appendage absent; segment X is oblique downward and bears a longitudinal mesal groove or crack dorsally; a pair of pigmented anal sclerites are fused and form a single board with a distinctive long root; and the dorsal appendage of the phallic apparatus is present with the basal 3/4 being fused with the aedeagus. Males of the R. retracta View in CoL Species Group are most similar to those of the R. lieftincki View in CoL Species Group in the shapes of the large, horizontal apicodorsal lobe of segment IX, the slanting segment X, and the subtriangular apical part of the inferior appendage, but can be distinguished from the latter by the presence of the dorsal appendage of the phallic apparatus.

Species descriptions