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 460.5—443.7 mya, existing for approximately 16.8 million years.
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| Genus: | Garryoceras Foerste (1925)
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Taxonomy
editGarryoceras 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
editThe 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[check spelling] is small, subcylindrical, and close to the venter. Internal details are unknown.
Fossil distribution
editFossil distribution is exclusive to the Putnam Highland, Canada.
References
edit- ^ PaleoBiology Database: Garryoceras, basic info
- ^ 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.
