Subgenus Orthostyloceras Lutz, 1933

Orthostylus Lutz & Neiva, 1914: 74 (sep., p. 8) (preocc. Beck, 1837). Type species, Orthostylus ambiguus Lutz & Neiva, 1914 (mon.).

Orthostyloceras Lutz in Borgmeier, 1933: 298 (as genus; nom. nov. for Orthostylus Lutz, & Neiva, 1914). Type species, Orthostylus ambiguus Lutz & Neiva, 1914 (aut.). Refs.: Coscaron & Papavero, 2009: 88 (cat.).