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1“... , Xiphograptus ) position. The evolution of the virgellar spine in the Pan‐Bireclinata in the Upper Dapingian...”
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2“... Valley Formation (Dapingian) of California, USA. Other species. Protocalymene sp. of Ross (1970, p. 92...”
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3“... Valley Formation (Dapingian) of California, USA. Other species. Protocalymene sp. of Ross (1970, p. 92...”
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