Conostichoceras

Conostichoceras
Conostichoceras
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: †Oncocerida
Family: Nothoceratidae
Genus: Conostichoceras

Conostichoceras is an exogastric, breviconic oncocerid included in the family Nothoceratidae, known from the Middle Devonian of central Europe and Upper Devonian of Australia.[1][2] It probably lived on and swum above the sea floor.[3]

Contents

Morphology

Conostichoceras, named by Foeste, 1926, produced a depressed exogastric breviconic shell with short, wide chambers and large living chamber, similar to Blakeoceras and Turnoceras but differing details especially of the siphuncle. The siphuncle is ventral; nummuloidal in the adapical half of the phragmocone but with concave profiles in the adoral half, and is actinosiphonate. The sides of the living chamber in the adult converge slightly on the aperture.[1]

Taxonomy

In its broader taxonomy Conostichoceras belongs to a group of nautiloid cephalopods known as the Nautilitoidea, a superorder that includes the orders Oncocerida, Tarphycerida, and Nautilida.[4] The family Nothoceratidae to which it belongs is one of 16 included in the Oncocerida.[1]

References

  1. ^ a b c Sweet, W.C. 1964. Nautiloidea-Oncocerida Treatise on Invertebrate Paleontology part K.
  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.  edit
  3. ^ Conostichoceras. The Paleobiology Database.
  4. ^ Wade, M. 1988. Nautiloids and their descendants: cephalopod classification in 1986. Memoir 44, pp 15-25; New Mexico Bureau of Mines and Mineral Resources, Socorro, NM

See also

Barskov, I. S.; Boiko, M. S.; Konovalova, V. A.; Leonova, T. B.; Nikolaeva, S. V. (2008). "Cephalopods in the marine ecosystems of the Paleozoic". Paleontological Journal 42 (11): 1167. doi:10.1134/S0031030108110014.  edit (includes limited images of fossil material)

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