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
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 ...
. 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 by t ...
stage of the Upper Cretaceous.
Genera include:
*''
Buccinammonites''
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Buchiceras''
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Cryptometoicoceras''
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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.
Species ...
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Laube & Bruden, 1886
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Metasigaloceras''
Hyatt, 1903
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Metoicoceras
''Metoioceras'' is an extinct genus of cephalopod belonging to the Ammonite subclass which lived during the Cenomanian.
References
;Notes
Ammonitida genera
Acanthoceratidae
Cretaceous ammonites
Ammonites of North America
Ammonites of ...
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Hyatt, 1903
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Mitonia''
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Nannometoicoceras''
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Parabuchiceras''
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Paracompsoceras''
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Plesiacanthoceras''
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Praemetoicoceras''
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Pseudoaspidoceras
''Pseudoaspidoceras'' is an extinct genus of ammonites in the family Acanthoceratidae.
These cephalopods lived during the Turonian stage of the Upper Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 mil ...
''
Hyatt, 1903
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Rhamphidoceras''
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Spathites''
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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
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