Abbasites

Abbasites was originally described by Sydney S. Buckman in 1921,^[3][4] with A. abbas as its type species, and was considered by some to be a subgenus of Erycites. Abbasites was included in the Otoitidae, the ancestral family of the Stephanoceratoidea, according to Westermann (1965)^[5][6] and Imlay (1984)^[5] but was previously placed in the Hildoceratoid family Hammatoceratidae by Arkell et al. (1957).^[3] It is currently regarded as a full genus in the Erycitidae subfamily Erycitinae.^[7][8] The genus Erycites is believed to be ancestral to Abbasites. However, Abbasites is believed to have left its own descendants in the ammonite family Otoitidae.^[9]

Valid species:

• Abbasites abbas, found in southern Spain.
• A. platystomus, found in southern Alaska.
• A. sparsicostatus (described by Ralph Imlay)

Dubious and excluded species:

•  ?Abbasites cestiferus; type specimen too small to be certain about classification.
• (Abbasites) challinori;^[10] originally thought to be closely related to A. abbas, but following subsequent study has been removed from Abbasites to the genus Opuatia^[10]

• Mikko's Phylogeny Archive's entry on †Ammonoidea