''Blanfordiceras'' is a strongly ribbed, evolute
ammonite
Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ...
included in the
perisphinctacean family,
Neocomitidae 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
''Berriasella'' is a discoidal evolute perisphinctacean ammonite, and type genus for the neocomitid subfamily Berriasellinae. Its ribbing is distinct, consisting of both simple and bifurcated ribs that extend from the umbilical seam across th ...
'', although with a more rounded whorl section.
References
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{{Taxonbar, from=Q4925089
Cretaceous ammonites
Ammonitida
Fossils of Antarctica
Tithonian life