Thalassoceratoidea, formerly Thalassocerataceae, is a superfamily of Late

Paleozoic The Paleozoic (or Palaeozoic) Era is the earliest of three geologic eras of the Phanerozoic Eon. The name ''Paleozoic'' ( ;) was coined by the British geologist Adam Sedgwick in 1838 by combining the Greek words ''palaiós'' (, "old") and ' ...

ammonites characterized by their thick-discoidal to subglobular, involute shells with narrow or closed umbilici and biconvex growth striae with ventral sinuses. The ventral lobe of the suture, which straddles the outer rim, is wide, and bifid, with a tall median saddle. Thallassoceratoidea are gonitites and one of seventeen superfamilies in the

Goniatitina Goniatitina is one of two suborders included in the order Goniatitida; extinct Paleozoic Ammonoidea, ammonoid cephalopods only distantly related to the Nautiloidea. Taxonomy The Goniatitina contains 17 defined superfamilies, listed below. * Adr ...

suborder. Two families are now included, Bisatoceratidae and Thalassoceratidae. The somewhat older but overlapping Bisatoceratidae used to be included as a subfamily in the

Goniatitidae Goniatitidae is one of three families included in the ammonoid cephalopod superfamily Goniatitoidea, known from the Lower Mississippian to the Upper Permian The Permian ( ) is a geologic period and System (stratigraphy), stratigraphic syste ...

. Thalassoceratidae was included in the Dimorphocerataceae.

References

* *Thalassoceratoidea i
GONIAT
6/14/12 Goniatitida superfamilies Goniatitina {{Goniatitida-stub