Paradakeoceras is a genus of early Ordovician cephalopods belonging to the nautiloid order Ellesmerocerida.[1]
Paradakeoceras Temporal range:
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | Nautiloidea |
Order: | †Ellesmerocerida |
Family: | †Ellesmeroceratidae |
Genus: | †Paradakeoceras Flower, 1964 |
Species | |
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Morphology
editThe 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
edit- ^ 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.565-572&rft.date=2007&rft_id=info:doi/10.1111/j.1475-4983.2007.00644.x&rft_id=info:bibcode/2007Palgy..50..565K&rft.aulast=Kröger&rft.aufirst=B. R.&rft_id=https://doi.org/10.1111%2Fj.1475-4983.2007.00644.x&rfr_id=info:sid/en.wikipedia.org:Paradakeoceras" class="Z3988">