Allocotoceras

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Allocotoceras
Temporal range: L Ordovician
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Endocerida
Family: Endoceratidae ?
Genus: Allocotoceras
Teichert & Glenister 1953

Allocotoceras is an endocerid from the Lower Ordovician (upper Canadian) of Australia (Tasmania), included in the Endoceratidae, based on small, straight or gently curved siphuncles.

Septal necks, according the Teichert, 1964, are holochoantic, reaching to the previous septum. Endocones are described as having a dorsal wedge, or process, making the internal opening, or endosiphocone, simicircular in cross section. In this sense Allocotoceras seems to resemble the genus Najaceras.

References[edit]

  • Teichert, C. 1964. Endoceratoidea. Treatise on Invertebrate Paleontology, Part K. Endoceratoidea, Actinoceratoidea, Nautiloidea. Geological Soc. of America and Univ. Kansas Press.
  • Allocotoceras -Paleodb