Alaskoceras

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Alaskoceras
Temporal range: Early/lower Ordovician
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Tarphycerida
Family: Estonioceratidae
Genus: Alaskoceras
Miller & Kummel, 1945

Alaskoceras is a lower Ordovician coiled Nautiloidea cephalopod; the shell moderately expanded, ribbed, with a divergent living chamber; whorl section more broadly rounded ventrally than dorsally; siphuncle marginal at maturity, septal necks short, almost achoanitic; connecting rings thick, layered.

Alaskcoceras belongs to the Tarphycerida, and to the family Estonioceratidae. It was found in Alaska.

References[edit]

  • W.M Furnish & Brian F. Glenister, 1964. Nautiloidea-Tarphycerida. Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press.