Trachyceratidae

Taxonomics

Class: Cephalopoda

Order: Ceratitida

Superfamily: Trachycerataceae

Family: Trachyceratidae

The Trachyceratidae constitute and family of ceratitid ammonoid cephalopods that lived during the Middle and Late Triassic. Shells are more or less involute, generally with a median furrow running along the venter, bordered by rows of tubercles or coninuous keels and sides with flexious ribs that usually have tubercles arranged in the spiral pattern.

Genera include Trachyceras and Sirenites, which have subgenera, Pseudosirenites, Dawsonites, Vredenburgites, and Welterites.