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Temporal range: MiddleSilurian
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
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.


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