Abstract
1. 1. The taxonomic relationship of two morphologically very similar sea-urchins, Echinostrephus aciculatus A. Agassiz and E. molaris (Blainville), was examined by means of gel electrophoresis of 18 different enzyme systems. 2. 2. The results demonstrated that the two species shared common allozymes at 25 of the 26 genetic loci studied here and that the Nei's genetic identity value ( I = 0.963) obtained between the two species was comparable to those already reported between conspecific local populations of many other animals. 3. 3. Their genetic similarity verified by the present electrophoretic study and their morphological and ecological similarity strongly suggest that E. aciculatus and E. molaris may belong to one and the same species.
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