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 tubercles on sparse ribs that may be round and strong, sharp and narrow, or absent. The suture is somewhat simpler than that of the
Acanthoceratinae. Range is restricted to the lower
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 ...
stage of the Upper Cretaceous.
Genera include:
*''
Buccinammonites''
*''
Buchiceras''
*''
Cryptometoicoceras''
*''
Dunverganoceras''
Warren & Stelck, 1940
*''
Mammites
''Mammites'' is a Late Cretaceous ( Cenomanian to Turonian) ammonite genus included in the acanthoceratoidean family, Acanthoceratidae, and the type genus for the subfamily Mammitinae. ''Mammites'' was named by Laube and Bruder in 1887.
Speci ...
''
Laube & Bruden, 1886
*''
Metasigaloceras''
Hyatt, 1903
*''
Metoicoceras''
Hyatt, 1903
*''
Mitonia''
*''
Nannometoicoceras''
*''
Parabuchiceras''
*''
Paracompsoceras''
*''
Plesiacanthoceras''
*''
Praemetoicoceras''
*''
Pseudoaspidoceras''
Hyatt, 1903
*''
Rhamphidoceras''
*''
Spathites''
*''
Texacanthoceras''
References
* W.J. Arkell, et al., Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Geological Society of America and University of Kansas Press.
Acanthoceratidae
Turonian first appearances
Turonian extinctions
{{ammonitina-stub