1 | Ammonites are a group of marine animals of the subclass Ammonoidea in the class Cephalopoda , phylum Mollusca. | |
2 | Most species of octopus have no internal skeleton, unlike other cephalopods. | |
3 | One of 25 species in the deep-water genus Benthoctopus, this cephalopod lives in Gulf of Mexico waters as deep as 13,000 feet. |