Branched arms with pinnules occur in

Crinoidea

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Holothuroidea

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Echinoidea

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Asteroidea

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Solution

The correct option is C Crinoidea
A) Members of Crinoidea (feather stars) have five arms that are branched so that it appears as ten arms arms which have pinnules on them.
B) Members of Holothuroidea do not have arms.
C) Members of Echinoidea do not have arms.
D) Members of Asteroidea have five arms that are flat.
So the correct answer is 'Crinoidea'.

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