fə̇ˈläsərəs noun
Usage: capitalized
Etymology: New Latin Phyllocerat-, Phylloceras, from phyll- + -cerat-, -ceras -ceras
: 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