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Temporal range: Early Hauterivian
Aegocrioceras spathi 01.JPG
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Ammonitida
Family: Aegocrioceratidae
Genus: Aegocrioceras
Spath, 1924

Aegocrioceras is an extinct ammonite genus of cephalopod from the Lower Cretaceous included in the Ammonitida. It is known from northern Europe.

Aegocrioceras is coiled in an open planispiral; whorls are strongly ribbed and bear spines on the outer shoulders (ventro-lateral) of the inner whorls. Aegocrioceras is similar to the earlier Upper Valanginian Juddiceras of Germany and to the later Shasticrioceras from the Barremian of California and Japan.

Aegocrioceras was placed in the "Crioceratidae" (Ancyloceratidae, Crioceratinae) in Part L of the American Treatise on Invertebrate Paleontology published in 1957. Since then it has been reassigned to the Aegocrioceratidae which is included in the superfamily Protancyloceratoidea.


W.J Arkell, et al. 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas Press.