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Free Content The Correlation of Symmetry, Color and Spination in an Urchin

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An abnormal specimen of Lytechinus variegatus is described in which one ocular plate has apparently become broken, the part producing interambulacra remaining in its normal position and the ambulacrum-forming part remaining in the neighborhood of the ambitus. Two extra interambulacra were inserted at an early stage of growth but later disappeared. There was a normal but compressed radial canal system under the displaced ambulacrum. In a second abnormal specimen, one ambulacrum is abnormally narrow.

Both these specimens, and one previously described, showed a correlation between shape changes, reduction of spination, and disturbance of color pattern.

Document Type: Research Article

Publication date: March 1, 1965

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