''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'']
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.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).
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References
Further reading
* ''Fossils'' (Smithsonian Handbooks) by David Ward
{{Taxonbar, from=Q5200559
Cephalopod genera
Ordovician cephalopods
Molluscs of North America
Ordovician cephalopods of North America
Cephalopods of South America
Ordovician cephalopods of South America
Ordovician Argentina
Ordovician Bolivia
Ellesmerocerida