Sclerostomus costatus Benesh,1956: 65 (orig. comb.)
Sclerognathus costatus Germain,1911: 66 (nomen nudum)

P. costatus, male. ...Photo by M.J. Paulsen.	Distribution of P. costatus.

Distribution:

The costate flightless stag beetle is distributed in the vicinity of Parques Nacionales Tolhuaca and Llonquimay in La Araucanía region, Chile.

Taxonomy:

Paulsen, M.J. (in press). Monographic revision of the southern South American stag beetles of the genus Pycnosiphorus Solier (Coleoptera: Lucanidae: Lucaninae). Bulletin of University of Nebraska State Museum.

Weinreich, E. 1958. Die südamerikanische Lucanidengattung Pycnosiphorus (Ins. Col.). Senckenbergiana Biologica 39: 265-288.