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Cyptendoceras
''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 .〔(PaleoBiology Database: ''Cyptendoceras'', basic info )〕
==Taxonomy==
''Cyptendoceras'' was named by Ulrich and Foerste (1936). Teichert (1964,〔Curt Teichert, 1964. Endoceratoidea, ''in'' the Treatise on Invertebrate Paleontology, Part K, Mollusca 3; Geol Soc of Amer, and Univ. of Kans. press.〕 in the Treatise, included it in the endocerid family
Proterocameroceratidae. Flower (1964)〔 Flower 1964. The Nautiloid Order Ellesmeroceratida (Cephalopods), Memoir 12; ''New Mexico'' State Bureau of Mines and MIneral Resources, Socorro. NM 〕 in Memoir 12 assigned it to the Baltoceratidae, at that time included in the Ellesmeroceratida. Kroger et al. (2007)〔 Kroger et al 2007. Early orthoceratoid cephalopods from the Argentine Precordillera; Journal of Paleontology Nov 2007; v. 81; no. 6; pp 1266-1283 〕 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.
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