Temporal range: Early Hauterivian
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.
This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (March 2013) (Learn how and when to remove this template message)
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.