Pentamerida is an order of biconvex, impunctate shelled, articulate brachiopods that are found in marine sedimentary rocks that range from the Middle Cambrian through the Devonian. Pentamerids are characterized by a short hinge line where the two valves articulate, inner areas above the hinge line that slope inwardly from the beak of each valve, a...
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http://en.wikipedia.org/wiki/Pentamerida
(from the article `Silurian Period`) The Pentamerus community was an early Silurian community dominated by the large-shelled brachiopod (lamp shell) of the species Pentamerus oblongus. ... ...(with rods of calcite), rarely impunctate; more than 400 genera; Early Ordovician (490,000,000 years ago) to Early Jurassic (180,000,000 years ......
Found on
http://www.britannica.com/eb/a-z/p/40
No exact match found.
