Garryoceras

Garryoceras is an extinct genus, probably from the actively mobile carnivorous cephalopod order Orthocerida, that lived in what would be North America during the Late Ordovician, from 460.5โ€”443.7 mya, existing for approximately 16.8 million years.

Garryoceras
Temporal range: Upper Ordovician
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Orthoceratoidea
Order:
Orthocerida
Genus:
Garryoceras

Foerste (1925)

Taxonomy

Garryoceras was named by Foerste (1925) and was assigned to the Orthocerida by Teichert et al. (1964)[1] Garryoceras was listed in the Endocerida by Sepkoski (2002).

Morphology

The shells of Garryoceras are depressed orthocones (height less than width), described as having a flattened dorsum and more narrowly rounded venter,[2] in other words boatlike. Camerae are short. Sutures form broad, shallow dorsal lobes and slope toward the apex going from the dorsum to the venter. The sipuncle is small, subcylindrical, and close to the venter. Internal details are unknown.

Fossil distribution

Fossil distribution is exclusive to the Putnam Highland, Canada.

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References
  1. PaleoBiology Database: Garryoceras, basic info
  2. Sweet 1964, Garryoceras K2590-K260 in Nautiloidea-Orthocerida, Treatise on Invertebrate Paleontology Part K, Teichert and Moore (eds), Geological Society of America and University of Kansas press.
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