Clydonitoidea, formerly Clydonitaceae, is a superfamily in the ammonoid cephalopod order Ceratitida characterized by generally costate and tuberculate shells with smooth, grooved, or keeled venters and sutures that are commonly ceratitic or ammonitic but goniatitic in a few offshoots.

The emended Trachycerataceae includes the Trachyceratidae, Arpaditidae, Cyrtopleuritidae, Distichitidae, Heraclitidae, Noridiscitidae, and Tibetitidae.

According to Kummel (1952) and Arkel et al. (1962) in the Treatise on Invertebrate Paleontology, the Arpaditidae and Trachyceratidae are both derived from the Ceratitaceae.

The Arpatitidae gave rise in the lower Upper Triassic to the Buchitidae, Choristoceratidae, Clionitidae, Distichitidae, and Thisbitidae.

Tozer distinguished the Choristoceratidae and Cochloceratidae as forming their own superfamily, the Choristocerataceae, with the addition of the Cycloceltitidae and Rhabdoceratidae.