miller, funish, and schindewolf, 1957, in the treatise on invertebrate paleontology part l included "thalassoceras", "eothalassoceras", "delepinoceas", "gleboceras", "epithalassoceras". saunders, work, and nikolaeva, 1999, included "eothalassoceras", "prothalassoceras", "gleboceras", "aistoceras", "thalassoceras", "epithalassoceras", "aristoceratoides". in the revised treatise (w.m. furnish et al. 2009) the thalassoceratidae is divided into two subfamilies, the gleboceratinae which includes "gleboceras" and "mapesites" and the thalssoceratinae which includes "aristoceras", "aristoceratoides", "eothalassoceras", "epithalassoceras", "prothalassoceras", and "thalassoceras".