Acanthoceratidae is an extinct

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

of acanthoceratoid

cephalopod A cephalopod is any member of the molluscan Taxonomic rank, class Cephalopoda (Greek language, Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral symm ...

s in the order

Ammonitida Ammonitida, or true ammonites, are an order of Ammonoidea, ammonoid cephalopods that lived from the Jurassic through Paleocene time periods, commonly with intricate ammonitic sutures. Ammonitida is divided into four suborders, the Phylloceratina ...

, known from the

Upper Cretaceous The Late Cretaceous (100.5–66 Ma) is the more recent 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 ''cret ...

. 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 de Groussouvre, 1894 * Euomphaloceratinae Cooper, 1978 * Mammitinae (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 The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ...

, 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