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Fig. 3. Regenerating arm of Amphiura filiformis. The new arm has extended
in length and is clearly distinguishable from the older stump. The demarcation
between the proximal differentiated part (with ossicles, podia and spines) and
the distal undifferentiated part is indicated by a dotted line. DL,
differentiated length (in mm); RL, regenerated length (in mm).