Paradakeoceras
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| Paradakeoceras Temporal range:
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|---|---|
| File:Breviconic ellesmeroceridan.svg | |
| Scientific classification Edit this classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | †Ellesmerocerida |
| Family: | †Ellesmeroceratidae |
| Genus: | †Paradakeoceras Flower, 1964 |
| Species | |
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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
- ↑ 1.0 1.1 1.2 Flower, R. H. (1964). "The Nautiloid Order Ellesmerocerida". New Mexico Bureau of Mines and Mineral Resources. Memoir. 12.
- ↑ 2.0 2.1 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.
