 | This article possibly contains original research. (February 2021) |
| Orthocerida Temporal range:
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|---|---|
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| Orthoceras | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Orthoceratoidea |
| Order: | †Orthocerida Kuhn, 1940 |
| Families | |
Orthocerida, also known as the Michelinocerida, is an order of extinct orthoceratoid cephalopods that lived from the Early Ordovician (490 million years ago) possibly to the Late Triassic (240 million years ago).[1] A fossil found in the Caucasus suggests they may even have survived until the Early Cretaceous (150 million years ago),[2] and the Eocene fossil Antarcticeras is sometimes considered a descendant of the orthocerids although this is disputed.[3][4] They were most common however from the Ordovician to the Devonian.
- ^ "Orthocerida". Atlas of Ordovician Life. 2013-12-03. Retrieved 2023-10-10.
- ^ "An Early Cretaceous orthocerid cephalopod from north-western Caucasus | The Palaeontological Association". www.palass.org. Retrieved 2023-10-10.
- ^ Doguzhaeva, Larisa A.; Bengtson, Stefan; Reguero, Marcelo A.; Mörs, Thomas (2017-03-01). "An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods". PLOS ONE. 12 (3): e0172169. doi:10.1371/journal.pone.0172169. ISSN 1932-6203. PMC 5332165. PMID 28248970.
- ^ Fuchs, Dirk; Keupp, Helmut; Klug, Christian (2020-01-02). "A critical review of Antarcticeras Doguzhaeva, 2017 – teuthid affinities can explain the poorly mineralized phragmocone". Historical Biology. 32 (1): 49–54. doi:10.1080/08912963.2018.1467905. ISSN 0891-2963.