Parryoceras
Appearance
Parryoceras Temporal range: Middle and Late Ordovician
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | Nautiloidea |
Order: | †Discosorida |
Family: | †Cyrtogomphoceratidae |
Genus: | †Parryoceras Sweet and Miller, 1957 |
Parryoceras is a cyrtogomphoceratid similar to Strandoceras but with broadly expanded siphuncle segments and a nearly straight ventral line. The mature shell is thickened on the inside just behind the aperture resulting in a constriction in the internal mold at the adoral end.
Parryoceras comes from the middle and upper Ordovician of arctic Canada and Norway.
References
[edit]- Flower, Rousseau H. and Curt Teichert, 1957; The Cephalopod Order Discosorida, in University of Kansas Paleontological Contributions, Mollusca Article 6, pp 1–144 (plates, figs) July 1, 1957.
- Curt Teichert 1964. Nautiloidea-Discosorida; Treatise on Invertebrate Paleontology Part K, Endoceratoidea, Actinoceratoidea, Nautiloidea. Geological Society of America.