Coeloceratidae

Coeloceratidae is a family of ammonites belonging to the Eoderoceratoidea that lived during the Early Jurassic.[1] 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 Stephanoceras. Once regarded as the subfamily Coeloceratinae in the Eoderoceratidae, these ammonites are now given familial rank.

Coeloceratidae
Temporal range: Hettangian–Toarcian[1]
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Superfamily: †Eoderoceratoidea
Family: †Coeloceratidae
Genera
  • Coeloceras
  • Apoderoceras
  • Coeloderoceras
  • Hyperderoceras
  • Pimalites
  • Praesphaeroceras
  • Tetraspidoceras

Genera included in the Coeloceratidae are Coeloceras, Apoderoceras 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

References
  1. "Encyclopedia of Life". 2002. Retrieved 2014-05-28. Cite journal requires |journal= (help)
  • Arkell et al., 1957. Mesozoic Ammonoidea, in Treatise on Invertebrate Paleontology, (Part L); Geological Soc. of America and University of Kansas press.
  • Donovan, Callomon, and Howarth 1981. Classification of the Jurassic Ammonitina; Systematics Association.


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