''Condraoceras'' is a genus of
liroceratids from the Pennsylvanian of North America and Lower Permian of Europe with a compressed, involute, nautiliconic shell; subcircular whorl section; small umbilicus with a rounded shoulder; suture with shallow ventral and lateral lobes; and narrow subcentral siphuncle.
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Liroceras
''Liroceras'' is a genus of nautiloid cephalopod. It is the type genus of the clydonautiliacean family, Liroceratidae
Liroceratidae is an extinct family of nautilids, shelled marine molluscs, belonging to the Clydonautiloidea, consisting ...
'', from the same time and type of the family, differs in having a reniform whorl section and essentially straight sutures at maturity. ''
Peripetoceras
''Peripetoceras'' is a genus in the Clydonautilacean family, Liroceratidae. It can be recognized by its smooth, involute shell with a deep small umbilicus with rounded shoulders and steep convex wall; whorl section with flattened venter, rounde ...
'', another related genus, has a flattened venter, slight ventral and lateral lobes in the suture, and a siphuncle offset dorsally from the center.
''References''
* Bernhard Kummel, 1964. Nautiloidea -Nautilida;
Treatise on Invertebrate Paleontology, Part K. Geol Soc of America and Univ of Kansas press, R.C. Moore (ed) -- Liroceratidae K444 -K447.
Prehistoric nautiloid genera
Pennsylvanian first appearances
Lopingian genus extinctions
{{Paleo-nautiloid-stub