- The gall mite genus Pentamerus, established by Roivainen in 1951, is invalid and needs to be renamed. Until this happens, use Pentamerus (mite).
| Pentamerus Temporal range: Silurian - Middle Devonian
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| Silurian Pentamerus brachiopod. | |
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| Genus: | Pentamerus Sowerby, 1813
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Pentamerus (meaning "five thighs") is a prehistoric genus of brachiopods that lived from the Silurian to the Middle Devonian in Asia, Europe, and North America.