''Acrimeroceras'' is an oxyconic

Devonian The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian per ...

goniatite Goniatids, informally goniatites, are ammonoid cephalopods that form the order Goniatitida, derived from the more primitive Agoniatitida during the Middle Devonian some 390 million years ago (around Eifelian stage). Goniatites (goniatitids) su ...

and one of three genera included in the subfamily Paratornoceratinae. The others being '' Paratornoceras'' and ''

Paratoceras ''Paratoceras'' is an extinct genus of Artiodactyla, of the family Protoceratidae, endemic to North America. They lived during the Early to Middle Miocene, 20.4—10.3 Ma, existing for approximately . ''Paratoceras'' resembled deer, but were pr ...

'' or ''ex'' '' Polonites''. ''Acrimeroceras'' has a shell like that of ''Paratornoceras'' with biconvex growth lines and constrictions and simple dorsal lobe. The adult shell is extremely compressed, smooth, oxyconic to lanceolate in section. Early growth stages are depressed, subglobular, smooth or ribbed, with an open umbilicus and rounded to suboxyconic venter, which sharpens relatively early during ontogeny. Sutural elements in general are broadly rounded except for the lateral lobe which is pointed and asymmetric.

References

* Morphometric Analyses and Taxonomy of Oxyconic Goniatites (Paratornoceratinae n. subfam) from the Early Famennean Tafilalt of the (Anti-Atlas, Morocco) in Proceedings of the Geological Survey, 57, Vienna, 2002. * ''Acrimeroceras'' i
Goniat Taxonomy

Acrimeroceras- Paleodb
* Miller, Furnish, and Schindewolf. Paleozoic 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. R.C. Moore (Ed). Geological Society of America, 1957. Dimeroceratidae Goniatitida genera Fossils of Morocco {{Goniatitida-stub