Definitions
from The Century Dictionary.
- noun A genus of pachycampylous ammonoid cephalopods having smooth, involute, compressed discoidal shells, often of large size, with very complex sutures, which are of ceratitoid outline in young stages of growth. The genus occurs in Cretaceous rocks.
Etymologies
Sorry, no etymologies found.
Support
Help support Wordnik (and make this page ad-free) by adopting the word placenticeras.
Examples
Sorry, no example sentences found.
Comments
Log in or sign up to get involved in the conversation. It's quick and easy.