The ataxioceratid ammonite fauna of the Tithonian (Upper Jurassic) of Casa Pincheira, Mendoza (Argentina)

The Tithonian Ataxioceratids from Casa Pincheira (Mendoza) are described in the framework of a period of global relative high sea level stand, with Andean basins well communicated with Central and Western Tethys. The family Ataxioceratidae is interpreted including the subfamily Torquatisphinctinae Tavera (Katroliceras Spath, Torquatisphinctes Spath, and Pachysphinctes Dietrich). The original specimens of ‘Perisphinctes’ densestriatus Steuer, Paraulacosphinctes striolatus (Steuer), Paraulacosphinctes? mangaensis (Steuer), and Torquatisphinctes proximus (Steuer) are photographically refigured, and their types are designated. Type specimens are also designated for Euvirgalithacoceras malarguense (Spath) and Choicensisphinctes choicensis (Burckhardt). The genus Euvirgalithacoceras is used for the first time for lowermost Tithonian Andean forms, and Choicensisphinctes is suggested as a derivated genus.