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Sigmocycloceras is a
nautiloid cephalopod discovered in the
Middle Ordovician of Korea, said to be
similar to Sactorthoceras, and
included in the Sactorthoceratidae...
- Leptoplatophrenoceras, Murrayoceras, Sactorthoceras, Scipioceras,
Sigmocycloceras, Wennanoceras, and Wolungoceras, with the
Sactorthoceratidae expanded...
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Ordovician of
China and Iran.
Related genera include Centroonoceras and
Sigmocycloceras Sweet,
Walter C. 1964.
Nautiloidea -Orthocerida.
Treatise on Invertebrate...
- †Shuranoceras †Siberioceras †Siberionautilus †Sibyllonautilus †Sichuanaceras †
Sigmocycloceras †Simardoceras †Simorthoceras †Simplicioceras †Sinclairoceras †Sinoceras...
