Paradakeoceras

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

Paradakeoceras
Temporal range: Tremadocian
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)

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


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.