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B
Echinoides
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C
Holothuroidea
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D
Asteroidea
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Solution
The correct option is A Ophiuroidea Ophiothrix is a large genus of brittle stars. They belong to the class of Ophiuroidea. They arefound in oceans and deep waters. They have a central disc shaped body. There is presence of mouth below the disc with jaw plates. They have very long slender and flexible arms. The arms helps in locomotion. They are also known as serpent stars.