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Gregoryceras
Taxonomy
Gregoryceras is a genus. It is not extant. Its type is Ammonites transversarius.
It was assigned to Peltoceratinae by Arkell et al. (1957); and to Ammonoidea by Sepkoski (2002).
It was assigned to Peltoceratinae by Arkell et al. (1957); and to Ammonoidea by Sepkoski (2002).
Species
Species lacking formal opinion data