SINCE 1828
Endoceras
noun
En·doc·er·as
| \enˈdäsərəs\
Definition of Endoceras
: a genus (the type of the family Endoceratidae) of Ordovician and Silurian nautiloid cephalopods with a straight shell having a very large siphuncle and endocones and reaching a length of 12 feet
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