Helicopsyche (Petrotrichia) Ulmer, 1910

Johanson, Kjell Arne & Oláh, János, 2006, Eleven new species of Sericostomatoidea from Madagascar (Trichoptera: Helicopsychidae, Petrothrincidae, Sericostomatidae), Zootaxa 1205, pp. 1-30 : 4

Helicopsyche (Petrotrichia) Ulmer, 1910

Type species: Helicopsyche palpalis (Ulmer, 1910) : 44.

The genus Petrotrichia was established for a species described from Mahé Island in the Seychelles, and originally classified within the Hydroptilidae . The species was transferred to Helicopsyche by Marlier & Malicky (1979). Johanson (1998) argued for a phylogenetically close relationship between the African species of the genus ( Seychelles, Madagascar and East Africa) and referred them to the subgenus Petrotrichia. Species of this subgenus are recognized by maxillary palps divided into a short basal and long distal segment, the basal segment bearing strong median setae; interantennal setal warts flat or absent; head tentorium without processes; forewing fork 3 and Cu1b absent, forewing crossvein R3­R4 directed posteriad, hind wing fork 1 longer than its stalk, crossvein M­Cu absent, Cu1 undivided; and abdominal reticulation reduced. The Madagascan species are recognized by having a longitudinal fold in the forewing, with sensillae located between veins M and Cu.