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Speden, I. G. (1967). Revision of Syncyclonema (Upper Cretaceous) and comparison with other small pectinid bivalves and Entolium. Postilla. 110: 1-36.
Speden, I. G. (1967). Revision of Syncyclonema (Upper Cretaceous) and comparison with other small pectinid bivalves and Entolium. Postilla. 110: 1-36.