Arms, pedicellariae and spines are absent in which of the following echinoderm?

Star Fish

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Sea Cucumber

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Sea Lily

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Sea Urchin

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Solution

The correct option is A Sea Cucumber
A) Star fish has spines and has five, flat arms. Pedicellariae are present.
B) Sea cucumber belongs to class Holothuroidea where members have no arms, no spines, no pedicellariae and no ambulacral grooves.
C) Sea lilies have no spines or pedicellariae, but have branched arms.
D) Sea urchins have no arms, but they have spines and pedicellariae.
So the correct answer is 'Sea cucumber'.

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