Abstract

Microcardinalia protriplesiana Amsden is a new species of Lower Silurian stricklandiid brachiopod from the Blackgum Formation of northeastern Oklahoma. This species is externally similar to M. triplesiana (Foerste) but differs in its more primitive brachial-plate structure. The brachial-plate arrangement in the new species is similar to that of Stricklandia lens progressa Williams from Llandoverian Cl beds, Carmarthenshire, Wales.

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