The segment of earthworm in which mouth is situated is called

Prosoma

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Prostomium

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Peristomium

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Prosegment

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Solution

The correct option is C Peristomium
Earthworm lack distinct head. The first segment at the anterior end of the body is called peristomium or buccal segment which bears crescentic mouth.
Peristomium bears a fleshly lobe-like structure called prostomium which hangs over the mouth ventrally.
So, the correct option is 'Peristomium'.

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