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The marine starfishes have usually radial five-armed symmetry. But some diversions were described. So, occurrence of specimens with 4-7 arms is described in big Indian star Oreaster reticulates that normally have 5 arms. We explored frequency of disorder in five-armed symmetry of starfishes Asterias amurensis and Patiria pectinifera from Amursky Bay of Japan Sea. Samples of Asterias amurensis taken...
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