Aegocrioceras

Aegocrioceras Temporal range: Early Hauterivian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Suborder:	†Ancyloceratina
Family:	†Aegocrioceratidae
Genus:	†Aegocrioceras Spath, 1924

Aegocrioceras is an

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.

References

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

• Aegocrioceras in the Paleobiology Database.