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 International Commission on Stratigraphy, ICS' geologic timescale, the second age (geology), age in the Late Cretaceous epoch (geology), Epoch, or a stage (stratigraphy), stage in the Upper Cretaceous series (stratigraphy), ...
stage of the Upper Cretaceous.
Genera include:
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Buccinammonites''
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Buchiceras''
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Cryptometoicoceras''
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Dunverganoceras''
Warren & Stelck, 1940
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Mammites''
Laube & Bruden, 1886
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Metasigaloceras''
Hyatt, 1903
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Metoicoceras''
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''
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
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, Mollusca 4. Geological Society of America and University of Kansas Press.
Acanthoceratidae
Turonian first appearances
Turonian extinctions
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