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New Lower Ordovician Brachiopods from the Llandeilo-Llangadock District
Published online by Cambridge University Press: 01 May 2009
Extract
External characters.—Plano-convex with a moderately deep ventral valve and a plane to slightly convex dorsal valve. Outline is semi-oval with the greatest width just anterior to the long straight hinge-line. Ventral interarea, wide, long, apsacline, dorsal interarea, anacline.
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