Pentagnostus
| Pentagnostus Temporal range: | |
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| Pentagnostus brighamensis, 6mm, Spence Formation | |
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| Genus: | Pentagnostus Lermontova, 1940 |
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and see text for species | |
Pentagnostus is a genus of trilobites restricted to the Middle Cambrian. Its remains have been found in Siberia, Australia, North America, Scandinavia, and Kazakhstan.