Acrioceras is an extinct genus of cephalopods belonging to the ammonite subclass.[1]

Temporal range: Hauterivian-Barremian
~130–125.5 Ma
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Suborder: Ancyloceratina
Family: Acrioceratidae
Genus: Acrioceras
Hyatt 1900
Type species
Ancyloceras tabarelli
(Astier 1851)
  • A. hamlini Anderson 1938
  • A. meriani (Ooster 1860)
  • A. tabarelli (Astier 1851)
  • A. vespertinum Anderson 1938
  • A. voyanum Anderson 1938


A spire of one or two loosely coiled whorls followed by a short or long, straight or curved shaft, terminal hook, and short and or long final shaft. The ribs are generally fine and untuberculate, but sometimes the major ribs are enlarged and are carrying one to three tubercles. The ribs are single on the spire or the shaft but may branch from umbilical tubercles on the hook and the final shaft. The dorsum tends to become flat and the dorsolateral margin to become angular on the shaft and the hook.[1]


Fossils of Acrioceras have been found in:[2]


  1. ^ a b Wright, C. W. with Callomon, J.H. and Howarth, M.K. (1996), Mollusca 4 Revised , Cretaceous Ammonoidea, vol. 4, in Treatise on Invertebrate Paleontology, Part L (Roger L. Kaesler et el. eds.), Boulder, Colorado: The Geological Society of America & Lawrence, Kansas: University of Kansas Press, pp. 223, 224.
  2. ^ "Acrioceras". Fossilworks. Retrieved 2 May 2022.

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