External segmentation is absent but internal | vedclass

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(D) In the class $Hirudinea$ (leeches),the body is divided into a fixed number of segments (usually $33$).However,these segments are not marked extern

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Hirudinea

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(D) In the class $Hirudinea$ (leeches),the body is divided into a fixed number of segments (usually $33$).However,these segments are not marked externally by septa or grooves as clearly as in other annelids.Instead,the body is divided externally into a larger number of superficial rings called $annuli$.Therefore,the true internal segmentation is masked by these superficial external rings,making it appear as though external segmentation is absent or modified,while internal segmentation remains present.

External segmentation is absent but internal segmentation is present in

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