''Mammites'' is a

Late Cretaceous The Late Cretaceous (100.5–66 Ma) is the younger 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 ''creta'', the ...

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Cenomanian The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series. An age is a unit of geochronology; it is a unit of time; the stage is a unit in the s ...

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 ...

) ammonite genus included in the acanthoceratoidean family,

Acanthoceratidae Acanthoceratidae is an extinct family of acanthoceratoid cephalopods in the order Ammonitida, known from the Upper Cretaceous. The type genus is '' Acanthoceras''. Diagnosis Acanthoceratidae species are strongly tuberculate with at least umbil ...

, and the type genus for the subfamily Mammitinae. ''Mammites'' was named by Laube and Bruder in 1887.Sepkoski Online
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Species

Species within the genus ''Mammites'' include:''Mammites''
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Fossilworks Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ...

.org * ''M. mohavanensis'' Böse, 1923 - found at Loma el Macho, Coahuila, Mexico * ''M. mutabilis'' Reyment, 1955 - known from Cameroon * ''M. nodosoides'' Schlüter, 1871 - found in North and South America, Africa and Europe * ''M. powelli'' Kennedy ''et al.'', 1987 - found in Texas and Colombia * ''M. rancheriae'' Anderson, 1958 - known from the North American Pacific region

Description

Shells of ''Mammites'' are typically stout, usually with a rectangular or squarish whorl section and flattish to slightly concave venter and can reach a diameter of 15–20 millimeters (0.59–0.79 in). Ornamentation is dominated by strong umbilical tubercles and moderate inner and outer ventrolateral tubercles. Ribs are somewhat prominent in juveniles stages but tend to become inconspicuous in the adult. The suture is ammonitic but rather simple. Some species, those with broad first lateral lobes in the suture, have been reassigned to '' Morrowites'' ''Mammites'' and ''Morrowites'' are rather similar except that ''Mammites'' as redefined has a narrow first later lobe while that in ''Morrowites'' is broad and the early whorls in ''Morrowites'' are smooth except for widely spaced ribs and constrictions while those in ''Mammites'' have normal ribs and tubercles.

Distribution

Fossils of species within this genus have been found in the

formations of Angola, Brazil, Cameroon, Colombia ( La Frontera, Boyacá, Cundinamarca and Huila) and San Rafael Formations,Patarroyo, 2016, p.41Patarroyo & Rojas, 2007, pp.92-93 Egypt, France, India, Madagascar, Mexico, Nigeria, Peru, Romania, Tunisia, United States and Venezuela.

References

Bibliography

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Species

Description

Distribution

References

Bibliography

Further reading