The Acanthoceratinae comprise a subfamily of ammonoid cephalopods that lived during the Late

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of ...

from the latter early Cenomanian to the late

Turonian The Turonian is, in the ICS' geologic timescale, the second age in the Late Cretaceous Epoch, or a stage in the Upper Cretaceous Series. It spans the time between 93.9 ± 0.8 Ma and 89.8 ± 1 Ma (million years ago). The Turonian is preceded b ...

Shells are evolute, tuberculate and ribbed, with subquadrate to squarish whorl section wherein tubercles typically dominate over ribs. Derivation is from the Mantellicertinae in the early Cenomanian. Gave rise through '' Neocardioceras'' to the

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 ...

Genera

The following genera are included in the Acanthoceratinae according to various sources as indicated. *'' Acanthoceras'' Neumayer, 1875 *''

Acompsoceras ''Acompsoceras'' is an extinct genus of cephalopod belonging to the Ammonite subclass. It grew to a large size compared to most ammonites. Its shell reached in diameter when the animal reached adulthood. ''Acompsoceras'' appears in the fossil r ...

'' Hyatt, 1903 Ammonites.fr Acanthoceratinae
/ref> *'' Alzadites'' *'' Benueites'' Reyment, 1954 *'' Calycoceras'' Hyatt, 1900 *'' Conlinoceras'' Cobban & Scott, 1972 *'' Cunningtoniceras'' Collignon, 1937 *'' Eucalycoceras'' Spath, 1923 *'' Hypacanthohoplites'' Spath, 1923 *'' Kastanoceras'' *'' Kennediella'' *'' Microsulcatoceras'' *'' Nebraskites'' Kennedy & Cobban, 1988 *'' Neocardioceras'' Spath, 1926 *'' Nigericeras'' Schneegan, 1943 *'' Paraconlinoceras'' *'' Plesiacanthoceratoides'' *'' Prohauericeras'' *'' Protacanthoceras'' Spath, 1923 *'' Pseudocalycoceras'' Thomel, 1969 *'' Pseudovascoceras'' *'' Quitmaniceras'' Powell, 1963 *'' Sumitomoceras'' *'' Tarrantoceras'' *'' Tunesites'' *'' Thomelites'' *''

Watinoceras ''Watinoceras'' is a genus of acanthoceratid ammonite that lived during the early Turonian stage of the Late Cretaceous. Description Early whorls are compressed, finely ribbed with inner and outer ventrolateral and siphonal tubercles as in ...

'' Warren, 1930 (''Watinoceras'' has also been classified under

)

Distribution

Fossils of species within the Acanthoceratinae have been found in Upper Cretaceous sediments in Angola, Antarctica, Australia, Brazil, Canada, Denmark, Egypt, France, Germany, Japan, Jordan, Madagascar, Mexico, Nigeria, Oman, Peru, Russia, Switzerland, United Kingdom, United States and Venezuela.

References

* W.J. Arkell, ''et al.'', 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas Press. Acanthoceratidae Protostome subfamilies Cenomanian first appearances Turonian extinctions {{Ammonitina-stub