English Ammonoidea Cited by user Chris Capoccia on 24 Aug 2021 Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda.
English Cephalopod size Cited by user Mgiganteus1 on 05 Feb 2016 Size, and particularly maximum size, has been one of the most interesting aspects of cephalopod science to the general public.