Temporal range: M-U Triassic
Trachyceratid shells have their whorl sides covered with flexious ribs that are usually tuberculate. The venters generally have a median furrow bordered by rows of tubercles or continuous keels.
The Trachyceratidae makes up part of the superfamily Clydonitaceae along with such families as the Clydonitidae and Arpaditidae. The Clydonitaceae is also known by the junior synonym Trachycerataceae.
- Arkell et al. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L. 1957
- Bernhard Kummel 1952. A Classification of Triassic Ammonoids. Jour of Paleontology, Vol 26, No.5, pp 847-853, Sept 1952