Aenigmatoceras
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''Aenigmatoceras'' is a genus of
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 ...
cephalopod A cephalopod is any member of the molluscan Taxonomic rank, class Cephalopoda (Greek language, Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral symm ...
s from the Carboniferous of
Russia Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...
. It is tentatively placed within the family Cravenoceratidae based on similarities with '' Tympanoceras''.


References


The Paleobiology Database
accessed on 10/01/07 Cravenoceratidae Goniatitida genera Fossils of Russia Carboniferous ammonites {{Goniatitida-stub