Ambulacral grooves are absent in

Asteroidea

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Crinoidea

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Ophiuroidea

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Nautiloidea

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Solution

The correct option is C Ophiuroidea
A) Ambulacral grooves are present in Asteroidea.
B) Ambulacral grooves are present in Crinoidea.
C) Anus and ambulacral grooves are absent in Ophiuroidea.
D) Nautiloidea is a subclass of class Cephalopoda under phylum Mollusca.
So the correct answer is 'Ophiuroidea'.

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