Eleven new species of Sericostomatoidea from Madagascar (Trichoptera: Helicopsychidae, Petrothrincidae, Sericostomatidae) Author Johanson, Kjell Arne Author Oláh, János text Zootaxa 2006 1205 1 30 journal article 50790 10.5281/zenodo.172376 54e48000-e28d-42b8-993e-d39b4923683f 1175­5326 172376 Petrothrincus triangularis (Hagen, 1864) Fig. 59 Molanna triangularis Hagen, 1864: 225 [ Type locality: Swellendam, western Cape Province; material lost; larval case]. Petrothrincus triangularis (Hagen) Barnard, 1934 : 325 , 327. Petrothrincus triangularis (Hagen) ; Scott & de Moor, 1993 : neotype male: from specimens collected by Hans Malicky (AMG). The type material of P. triangularis on which the original description of this species was based on has never been found and is considered lost (Scott & de Moor 1993 ). A male neotype was designated by Scott (1993) .