''Mammites'' is a
Late Cretaceous
The Late Cretaceous (100.5–66 Ma) is the more recent 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 ''cre ...
(
Cenomanian
The Cenomanian is, in the International Commission on Stratigraphy's (ICS) geological timescale, the oldest or earliest age (geology), age of the Late Cretaceous epoch (geology), Epoch or the lowest stage (stratigraphy), stage of the Upper Cretace ...
to
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), ...
) ammonite genus included in the acanthoceratoidean family,
Acanthoceratidae
Acanthoceratidae is an extinct Family (biology), family of Acanthoceratoidea, acanthoceratoid cephalopods in the order Ammonitida, known from the Upper Cretaceous. The type genus is ''Acanthoceras (ammonite), Acanthoceras''.
Diagnosis
Acanthocer ...
, 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'']
at Fossilworks
Fossilworks was a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database, a large relational database assembled by hundreds of paleontologists from around the world.
History
Fossilworks was cr ...
.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 Late Cretaceous
The Late Cretaceous (100.5–66 Ma) is the more recent 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 ''cre ...
formations of Angola, Brazil, Cameroon, Colombia ( La Frontera, Boyacá, Cundinamarca and Huila) and San Rafael Formations,[Patarroyo, 2016, p.41][Patarroyo & Rojas, 2007, pp.92-93] Egypt, France, India, Madagascar, Mexico, Nigeria, Peru, Romania, Tunisia, United States and Venezuela.[
]
References
Bibliography
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Further reading
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{{Taxonbar, from=Q3844176
Ammonitida genera
Acanthoceratidae
Cretaceous ammonites
Ammonites of Africa
Ammonites of Asia
Ammonites of Europe
Ammonites of North America
Cretaceous Mexico
Cretaceous United States
Ammonites of South America
Cretaceous Brazil
Cretaceous Colombia
Cretaceous Peru
Cretaceous Venezuela
Cenomanian genus first appearances
Turonian genus extinctions
Fossil taxa described in 1887