Paradakeoceras

Paradakeoceras; Temporal range: Tremadocian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
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 cyrtocone^[1] 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

^ ^a ^b ^c Flower, R. H. (1964). "The Nautiloid Order Ellesmerocerida". New Mexico Bureau of Mines and Mineral Resources. Memoir. 12.
^ ^a ^b 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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[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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