Circulocrania
Circulocrania Temporal range: Middle Ordovician (Floian) | |
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Scientific classification | |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Trilobita |
Order: | Asaphida |
Superfamily: | Cyclopygoidea |
Family: | Cyclopygidae |
Genus: | Circulocrania Fortey, 1987 |
Circulocrania is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the later part of the Arenig stage of the Ordovician Period,[1] approximately 478 to 471 million years ago.
References
- โ 1.0 1.1 Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Trilobita entry)". Bulletins of American Paleontology 364: p.560. Retrieved 2008-01-12.