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Question
Which of the following echinoderm class possess neither arms nor spines?
Which of the following echinoderm class possess neither arms nor spines?
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Solution
The correct option is D Holothuroidea
Holothuroidea are also called as the sea cucumbers. They are abundant and diverse group of worm-like and soft-bodied echinoderms. Their major attributes is the lack of arms and the body wall is soft, rather than spiny or calcareous.
Asteroidea includes true starfishes which have a central disc and five arms (or more than five). They have spines or ossicles on the surface of their body.
Echinoidea are small spiny, globular animals.
Crinoidea are feather stars and are characterized by a mouth on the top surface that is surrounded by the feeding arms. They have spiny endoskeleton.
Therefore, the correct answer is option D.
Holothuroidea are also called as the sea cucumbers. They are abundant and diverse group of worm-like and soft-bodied echinoderms. Their major attributes is the lack of arms and the body wall is soft, rather than spiny or calcareous.
Asteroidea includes true starfishes which have a central disc and five arms (or more than five). They have spines or ossicles on the surface of their body.
Echinoidea are small spiny, globular animals.
Crinoidea are feather stars and are characterized by a mouth on the top surface that is surrounded by the feeding arms. They have spiny endoskeleton.
Therefore, the correct answer is option D.
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