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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Origin and Etymology of phylloceras
New Latin Phyllocerat-, Phylloceras, from phyll- + -cerat-, -ceras -ceras
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