Phylloceratina

Phylloceratina

Taxobox | name = Phylloceratina
fossil_range = Lower Triassic to Upper Cretaceous
regnum = Animalia
phylum = Mollusca
classis = Cephalopoda
subclassis = Ammonoidea
ordo = Ammonitida
subordo = Phylloceratina
subdivision_ranks = Genera
subdivision = "Phylloceras"
"Calliphylloceras"
"Holcophylloceras"
"Sowerbyceras"
"Ptychophylloceras"

The Phylloceratina suborder of ammonites are a group extending from the Lower Triassic to Upper Cretaceous periods. They are typically robust with strongly expanding whorls, small umbilici, and highly fractally ornate suture lines.

It appears that all other Jurassic and Cretaceous ammonites (Ammonitina, Lytoceratina, Ancyloceratina) must have arisen from the Phylloceratina, since among these ammonitides only Phylloceratina are present from the early Triassic period onward.


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