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†Pionaspis Denison 1964

urn:lsid:organismnames.com:name:2547432

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vDviiiClmi

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†Pionaspis Denison 1964

Denison 1964. The Cyathaspididae. A family of Silurian and Devonian jawless vertebrates. Fieldiana, 13(5) 1964: 309-473