''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 .''Cyptendoceras''
at

Fossilworks Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ...

.org

Taxonomy

''Cyptendoceras'' was named by Ulrich and Foerste (1936). Teichert (1964, in the Treatise), included it in the endocerid family Proterocameroceratidae. Flower (1964) assigned it to the

Baltoceratidae Baltoceratidae is an extinct family of orthoconic cephalopods belonging to the subclass Nautiloidea endemic to what would be Asia, Australia, Europe, North America, and South America during the Ordovician living from about 480–460 mya, exist ...

, 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 Orthocerida is an order of extinct Orthoceratoid cephalopods also known as the Michelinocerida that lived from the Early Ordovician () possibly to the Late Triassic (). A fossil found in the Caucasus suggests they may even have survived until ...

Distribution

Fossils of ''Cyptendoceras'' have been found in Argentina, Bolivia and the United States (Minnesota, Nevada, New Mexico, Texas, Vermont).

Taxonomy

Distribution

References

Further reading