Phylloceras

noun
Phyl·​loc·​er·​as | \fə̇ˈläsərəs\

Definition of Phylloceras 

: a genus (the type of the family Phylloceratidae) comprising smooth involute compressed ammonites with complex sutures that occur first in the Triassic and are believed to have been ancestral to most Jurassic and Cretaceous ammonites

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History and Etymology for Phylloceras

New Latin Phyllocerat-, Phylloceras, from phyll- + -cerat-, -ceras -ceras

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