Thalassoceratidae

Thalassoceratidae is a family of extinct marine mollusks that belonged to the subclass Ammonoidea, within the class Cephalopoda. They are characterized by their distinctive, coiled shells, which are typically smooth and lack ornamentation. Thalassoceratids are known from the Jurassic and Cretaceous periods, with their fossils found in marine deposits around the world. The family is divided into several genera, each with its own unique shell morphology. Thalassoceratidae is notable for its diversity and widespread distribution during the Mesozoic era. The family's taxonomy and classification are still a subject of ongoing research, as new fossils continue to be discovered and studied.