''Blanfordiceras'' is a strongly ribbed, evolute

ammonite 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) ...

included in the perisphinctacean family,

Neocomitidae Neocomitidae is a family of Lower Cretaceous ammonitids comprising genera with strongly ribbed evolute (all whorls exposed) to smooth, fairly involute (inner whorls mostly hidden) shells. In the 1957 description of the family Neocomitidae was r ...

that lived during the latest Jurassic. The shell of ''Blanfordiceras'' is discoidal, with evolute coiling and all whorls visible so as to have a broad umbilicus. Exposed whorls are ornamented with strong ribbing that arises from the umbilicus, bifurcating on the outer flanks and extending onto the venter. In general form ''Blanfordiceras'' is similar to '' Berriasella'', although with a more rounded whorl section.

References

;Notes ;Bibliography * {{Taxonbar, from=Q4925089 Cretaceous ammonites Ammonitida Fossils of Antarctica Tithonian life