Grimsbyoceras is a nautiloid genus included in the Oncocerida order of the family Acleistoceratidae that lived during the Middle Devonian. They have been found in North America (Illinois) and central Europe.
| Grimsbyoceras Temporal range: Mid Devonian
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| Genus: | Grimsbyoceras Foerste, 1926
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Grimsbyoceras, named by Foerste in 1926, has a depressed, breviconic shell, with an elliptical transverse aperture, without a hyponomic sinus, and a small, subventral siphuncle. The phragmocone is rapidly expanding and strongly exogastric. The body chamber is attached at knee-like bends on the ventral and lateral sides.
Acleistoceras and Poteriocerina are similar acleistoceratids from the Middle Devonian, differing primarily in internal detail.
References
edit- R.C. Moore, ed. (1964). Part K, Mollusca 3. Treatise on Invertebrate Paleontology. Lawrence, Kansas: Geological Society of America and University of Kansas Press. p. K190–K216.
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