External segmentation is absent but internal segmentation is present in

Polychaeta

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Oligochaeta

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Archiannelida

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Hirudinea

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Solution

The correct option is C Archiannelida
Archiannelida consists of exclusively marine forms. External segmentation is slightly marked by faint grooves (almost not visible), while internal segmentation is marked by coelomic septa. In the internal segments, the body is divided into numerous chambers which have the repetition of organs.
Hence, the correct answer is option (C).

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