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Temporal range: uL Ordovician
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Ellesmerocerida
Family: Ellesmeroceratidae
Genus: Cyptendoceras
Ulrich and Foerste (1936)

Cyptendoceras is an extinct nautiloid cephalopod included in the family Ellesmeroceratidae that lived in what would be North and South America during the latter part of the Early Ordovician (late Arenig) from about 475 - 472 mya, existing for approximately 3 million years.[1]


Cyptendoceras was named by Ulrich and Foerste (1936). Teichert (1964,[2] in the Treatise, included it in the endocerid family Proterocameroceratidae. Flower (1964)[3] in Memoir 12 assigned it to the Baltoceratidae, at that time included in the Ellesmeroceratida. Kroger et al. (2007)[4] reassigned it to the Ellesmeroceratidae on the basis of the ellesmeroceratid type siphuncle, removing it from the Baltoceratidae which had been reassigned to the Orthocerida.


  1. ^ PaleoBiology Database: Cyptendoceras, basic info
  2. ^ Curt Teichert, 1964. Endoceratoidea, in the Treatise on Invertebrate Paleontology, Part K, Mollusca 3; Geol Soc of Amer, and Univ. of Kans. press.
  3. ^ Flower 1964. The Nautiloid Order Ellesmeroceratida (Cephalopods), Memoir 12; New Mexico State Bureau of Mines and MIneral Resources, Socorro. NM
  4. ^ Kroger et al 2007. Early orthoceratoid cephalopods from the Argentine Precordillera; Journal of Paleontology Nov 2007; v. 81; no. 6; pp 1266-1283
  • Fossils (Smithsonian Handbooks) by David Ward