Partial Metamorphosis in Anomia simplex

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Science  30 Jun 1961:
Vol. 133, Issue 3470, pp. 2070-2071
DOI: 10.1126/science.133.3470.2070


Many larvae of the common bivalve, Anomia simplex, when grown under laboratory conditions, exhibited a partial metamorphosis. They attained a considerably larger size than that at which larvae normally set. The partial metamorphosis was also characterized by the disappearance of velum, but the retention of a functional foot. Moreover, these organisms were not able to attach to the substratum, and their shells showed a distinct demarcation line between larval and adult portions