''Macrocephalitidae'' is an

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

family of marine

invertebrate Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chordate ...

animals belonging to the superfamily

Stephanoceratoidea Stephanoceratoidea, formerly Stephanocerataceae, is a superfamily of middle- upper Jurassic ammonoid cephalopods within the order Ammonitida containing diverse forms, generally with sharp ribbing and complex suture lines. Aptychi are believed t ...

, order

Ammonitida Ammonitida is an order of ammonoid cephalopods that lived from the Jurassic through Paleocene time periods, commonly with intricate ammonitic sutures. Ammonitida is divided into four suborders, the Phylloceratina, Lytoceratina, Ancyloceratina, a ...

Etymology

The Macrocephalitidae is one of the 11 families listed in the

Treatise A treatise is a formal and systematic written discourse on some subject, generally longer and treating it in greater depth than an essay, and more concerned with investigating or exposing the principles of the subject and its conclusions."Treat ...

, 1957 Part L in the superfamily Stephanoceratoidea. According to Donovan et al. (1981) the superfamily Stephanoceratoidea should contain only five families and the Macrocephalitidae of the Treatise are reduced to subfamilies within the Sphaeroceratidae, Macrocephalitinae and Mayaitinae, but still in the Stephanoceratoidea.

Genus

* ''

Macrocephalites ''Macrocephalites'' is a genus of the stephanoceratoid ammonite family Macrocephalitidae, diagnostic of the Callovian stage of the Middle Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraph ...

'' † * '' Pleurocephalites'' †

References

* Arkell at al, 1957. Mesozoic Ammononidea, Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Geol. Soc. of America and Univ. Kansas press; R.C. Moore, Ed. p. L287 *Donovan, Callomon and Howarth, 1981. Classification of the Jurassic Ammonitina; Systematics Association
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Stephanoceratoidea Ammonitida families {{Ammonitina-stub