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A cladistic analysis of the sand dollars (Clypeasteroida: scutellina) and the interpretation of heterochronic phenomena

Classification of clypeasteroid echinoids

Biological test method

Distribution of Echinarachnius parma (Lamarck) and associated fauna on Sable Island Bank, southeast Canada

Living and fossil genera of the Clypeasteroida (Echinoidea, Echinodermata)

The legend of the sand dollar

Biological test method

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