Paradakeoceras

Paradakeoceras; Temporal range:
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	†Ellesmerocerida
Family:	†Ellesmeroceratidae
Genus:	†Paradakeoceras; Flower, 1964
Species
	P. minor Flower, 1964 ; P. planiventrum Flower, 1964 ; Levisoceras complanatum Unklesbay, 1954 (Synonymous) ; Burenoceras barnesi (Some specimens synonymous);

Paradakeoceras is a genus of early Ordovician cephalopods belonging to the nautiloid order Ellesmerocerida.¹

Morphology

The shell of Paradakeoceras is an expanding endogastric cyrtocone¹ with the siphuncle situated near the shell's concave margin.² A raised ring exists at the base of the body chamber, which is often preserved as a mould.²

Paradakeoceras was named by Flower, 1964,¹ for species previously included in Dakeoceras in which the cross section is broadened with consequent loss of lateral lobes in the suture.

Paradakeoceras shows a flattening of the venter which distinguishes it from Quebecoceras and has a reduction in the rate of expansion similar to that of Dakeoceras.

References

Flower, R. H. (1964). "The Nautiloid Order Ellesmerocerida". New Mexico Bureau of Mines and Mineral Resources. Memoir. 12.
Kröger, B. R. (2007). "Some Lesser Known Features of the Ancient Cephalopod Order Ellesmerocerida (Nautiloidea, Cephalopoda)". Palaeontology. 50 (3): 565–572. Bibcode:2007Palgy..50..565K. doi:10.1111/j.1475-4983.2007.00644.x.

[Flower1964-1] Flower, R. H. (1964). "The Nautiloid Order Ellesmerocerida". New Mexico Bureau of Mines and Mineral Resources. Memoir. 12.

[Kroger2007-2] Kröger, B. R. (2007). "Some Lesser Known Features of the Ancient Cephalopod Order Ellesmerocerida (Nautiloidea, Cephalopoda)". Palaeontology. 50 (3): 565–572. Bibcode:2007Palgy..50..565K. doi:10.1111/j.1475-4983.2007.00644.x.

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