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Fig. 6. External morphology of non-attached tube feet of Paracentrotus lividus (A,C) and Asterias rubens (B,D). Abbreviations: C, cilia; CA, central area; CG, circular groove; D, disc; LC, long cilia; P, pore; PA, peripheral area; S, stem; SC, short cilia. Boxed areas in A and B are magnified in C and D.