Kayoceras

Kayoceras Temporal range: MiddleSilurian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	†Discosorida
Family:	†Discosoridae
Genus:	†Kayoceras Foerste, 1934

Kayoceras is a genus of middle Silurian nautiloid cephalopods, known from Iowa and Illinois, belonging to the Discosoridae. Related genera include Discosorus, Endodiscosorus, and Stokesoceras. Kayoceras has a short, breviconic shell, like Discosorus, but with a more central siphuncle. Derivation is probably from Discosorus, through an evolutionary shifting of the siphuncle position, which has its origin in the Lowoceratidae, possibly through Tuyloceras.

References

• Curt Teichert, 1964. Nautiloidea -Discosorida; Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press.
• Kayoceras, Paleobiology database.