Quadragnostus
Quadragnostus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the Cambrian Period, which lasted from approximately 539 to 485 million years ago.
| Quadragnostus Temporal range: Cambrian | |
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| Family: | Metagnostidae |
| Genus: | Quadragnostus Howell, 1966 |
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