''Acompsoceras'' is an extinct genus of cephalopod belonging to the

Ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

subclass. It grew to a large size compared to most ammonites. Its shell reached in diameter when the animal reached adulthood. ''Acompsoceras'' appears in the fossil record during the early portion of the Cretaceous

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 ...

stage and goes extinct around the middle of that same stage.

Species

''Acompsoceras'' is in the same family as '' Acanthoceras'', the

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 contains several species: * ''A. amphibolum'' * ''A. calabarense'' * ''A. essendiense'' * ''A. inconstans'' * ''A. renevieri''

Distribution

Fossils of ''Acompsoceras'' have been found in Brazil, Colombia (

Hiló Formation The Hiló Formation ( es, Formación Hiló, Kih) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The predominantly shale formation dates to the Middle Cretaceous period; Late Albian to Early Ceno ...

), Germany, Madagascar, Nigeria, the United Kingdom and Texas.''Acompsoceras''
at

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

References

Cretaceous ammonites Acanthoceratidae Ammonitida genera Ammonites of South America Cretaceous Colombia Albian life Cenomanian life {{Ammonitina-stub