Ar (Cont.)
- †Arctocephalites
- †Arctoceras
- †Arctogymnites
- †Arctohungarites
- †Arctomeekoceras
- †Arctomercaticeras
- †Arctoprionites
- †Arctoptychites
- †Arctosirenites
- †Arctotirolites
- †Arestoceras
- †Argentiniceras
- †Argolites
- †Argonauticeras
- †Argosirenites
- †Arianites
- †Aricoceras
- †Arieticeras
- †Arietites
- †Arietoceltites
- †Arisphinctes
- †Aristoceras
- †Aristoceratoides
- †Aristoptychites
- †Arkanites
- †Armatites
- †Arnioceltites
- †Arnioceras
- †Arniotites
- †Arpadites
- †Arthaberites
- †Artinksia
- †Artioceras
- †Artioceratoides
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