Coeloceratidae is a family of ammonites belonging to the Eoderocerataceae

Eoderocerataceae

Eoderocerataceae is a superfamily of true ammonites from the Lower Jurassic, comprising seven phylogenetically related families, characterized in general by having ribbed evolute shells that commonly bear spines or tubercles...

] that lived during the Early Jurassic

Early Jurassic

The Early Jurassic epoch is the earliest of three epochs of the Jurassic period...

. Shells are evolute, tending to be broadly discoidal with depressed whorls bearing primary and secondary ribs that branch from outer lateral tubercles. Most of the included species have coronate inner whorls and outer tubercles only. In general, Coeloceratids resemble the Middle Jurassic

Middle Jurassic

The Middle Jurassic is the second epoch of the Jurassic Period. It lasted from 176-161 million years ago. In European lithostratigraphy, rocks of this Middle Jurassic age are called the Dogger....

 Stephanoceras

Stephanoceras

Stephanoceras is a Stephanoceratacean genus and type for the Stephanoceratidae, which lived during the Bajocian but is now extinct....

. Once regarded as the subfamily Coeloceratinae in the Eoderoceratidae

Eoderoceratidae

The Eoderoceratidae is the ancestral and most primitive family of the Eoderocerataceae; lower Jurassic ammonite cephalopods, characterized by evolute, commonly serpenticonic, shells that had long body chambers and would have had no stable floating position; and thus resemble contemporary...

, these ammonites are now given familial rank.

Genera included in the Coeloceratidae are Coeloceras, Apoderoceras

Apoderoceras

Apoderoceras is an extinct genus of cephalopod belonging to the Ammonite subclass....

Coeloderoceras, Hyperderoceras, Pimalites, Praesphaeroceras, and Tetraspidoceras. Tetraspidoceras, which is bituberculate, is a possible ancestral member of the family.

The Coeloceratidae give rise to the Dactylioceratidae