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 from about 475 – 472 mya, existing for approximately.

Taxonomy

Cyptendoceras was named by Ulrich and Foerste. Teichert, included it in the endocerid family Proterocameroceratidae. Flower assigned it to the Baltoceratidae, at that time included in the Ellesmeroceratida. Kroger et al. 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.

Distribution

Fossils of Cyptendoceras have been found in Argentina, Bolivia and the United States.