Trachycerataceae

Taxonomics

Class: Cephalopoda

Subclass: Ammonoidea

Order: Ceratitida

Superfamily: Trachycerataceae

Trachycerataceae is a superfamily of middle and upper Triassic ceratitid ammonites that unites the Arpaditidae and Trachyceratidae, and possibly the Distichitidae, each with median groove running along the outer or ventral rim.

The Arpaditidae and Distichitidae are generally evolute, with all whorls exposed while the Tracchyceratidae tend to be involute with the outer whorl envoloping the inner ones.