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Only internal segmentation is found in class
Only internal segmentation is found in class
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Solution
The correct option is D Archiannelida
The Archiannelida are minute annelids that live in the spaces between grains of marine sediment, were treated as a separate class because of their simple body structure, but are now regarded as polychaetes. Archiannelids are the most primitive of all annelids with only internal segmentation, parapodia and setae lacking. The majority of the members of only genera Protodrilus, Nerilla, Dinophilus form a component of the interstitial fauna. Therefore, the correct answer is option D.
The Archiannelida are minute annelids that live in the spaces between grains of marine sediment, were treated as a separate class because of their simple body structure, but are now regarded as polychaetes. Archiannelids are the most primitive of all annelids with only internal segmentation, parapodia and setae lacking. The majority of the members of only genera Protodrilus, Nerilla, Dinophilus form a component of the interstitial fauna.
Therefore, the correct answer is option D.
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