phylloceratid
noun
phyl·lo·cer·a·tid
ˌfilōˈserətə̇d,
-ətə̇d
plural -s
: an ammonite of the genus Phylloceras or family Phylloceratidae
Word History
Etymology
New Latin Phylloceratidae, family of ammonites, from Phyllocerat-, Phylloceras, type genus + -idae