Acanthoceratidae is an extinct

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

of acanthoceratoid cephalopods in the 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, Ancyloceratin ...

, known from the

Upper Cretaceous The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', th ...

. The type genus is '' Acanthoceras''.

Diagnosis

Acanthoceratidae species are strongly tuberculate with at least umbilical and ventrolateral tubercles in most genera included. Ribs are dominant in some, in others weak or absent on the outer whorls. Most are evolute, compressed to very depressed in section. Sutures are ammonitic with little variation, but showing a tendency for simplication in later genera.

Taxonomy

Acanthoceratidae de Grossouvre, 1894 includes the following subfamilies. *

Acanthoceratinae The Acanthoceratinae comprise a subfamily of ammonoid cephalopods that lived during the Late Cretaceous from the latter early Cenomanian to the late Turonian Shells are evolute, tuberculate and ribbed, with subquadrate to squarish whorl sectio ...

de Groussouvre, 1894 * Euomphaloceratinae Cooper, 1978 *

Mammitinae Mammitinae comprises a subfamily within the Acanthoceratidae (Ammonoidea) characterized by moderately to very evolute shells with rectangular to squarish whorl sections along with blunt umbilical and prominent inner and outer ventrolateral tuberc ...

(Hyatt, 1900) (= Fallotitinae Wiedmann, 1960; Mitoniainae Renz & Alvarez, 1979) * Mantelliceratinae Hyatt, 1903

References

* Wright, W.C. 1957 Family Acanthoceratidae Hyatt in W.J. Arkell, et al. 1957. Mesozoic Ammonoidea;. Treatise on Invertebrate Paleontology, Part L. Geological Society of America, R.C. Moore (ed).
The Paleobiology Database
Acanthoceratoidea Ammonitida families Late Cretaceous first appearances Late Cretaceous extinctions {{Ammonitina-stub