''Dayiceras'' is a finely ribbed polymorphitid eoderoceratacean

ammonoid Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

cephalopod from the Jurassic, named by Spath in 1920. The shell is evolute, coiled such that all whorls are exposed. The whorl section is compressed such as to be higher than wide. A row of fine tubercles runs along the middle of the outer rim, the venter.

Distribution

Jurassic deposites of British Columbia and the United Kingdom.

References

;Notes ;Bibliography * Arell et al.,1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L. Geological Society of America. Eoderoceratoidea Ammonitida genera Jurassic ammonites Extinct animals of Canada Pliensbachian life {{Ammonitina-stub