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Question

Which of the following Cnidarians lacks a medusoid stage?

A
Obelia
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B
Aurelia
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C
Physalia
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D
Metridium
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Solution

The correct option is D Metridium
Of the given options, the Metridium is the only Anthozoan. The Anthozoa are the most primitive forms of the Cnidarians and completely lack a medusoid 'jellyfish' stage in the life cycle with a polyp stage persistent throughout.
Therefore, the correct answer is option D.

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