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Temporal range: Devonian
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Goniatitida
Family: Dimeroceratidae
Subfamily: Paratornoceratinae
Genus: Acrimeroceras
Becker, 1993

Acrimeroceras is an oxyconic Devonian gonitite and one of three genera included in the subfamily Paratornoceratinae. The others being Paratornoceras and Paratoceras 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 ribbled, with an open umbilcus 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.


  • Morphometric Analyses and Taxonomy of Oxyconic Goniatites (Paratornoceratinae n. subfam) from the Early Famennean Tafilalt of the (Anti-Atlas, Morocco) in Proceeding of the Geological Survey, 57, Vienna, 2002.
  • Acrimeroceras in Goniat Taxonomy
  • Acrimeroceras- Paleodb
  • Miller, Furnish, and Schindewolf. Paleozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L. R.C. Moore (Ed). Geological Society of America, 1957.