Chasicotatus was originally described as a monotypic genus based on Chasicotatus ameghinoi Scillato-Yané, 1979, from the upper member of Arroyo Chasicó Formation (Las Barrancas Member, late Chasicoan). An additional species, Chasicotatus peiranoi , was erected by Esteban and Nasif (1996).…