The first segment of the earthworm, which contains the mouth, is called the:
Show answer and explanation
Correct answer: Peristomium
The peristomium (buccal segment) is the true first segment of the earthworm and bears the mouth. The prostomium is a fleshy lobe that hangs over the mouth but is not a segment.
Keep practicing
More Morphology of Earthworm questions
- What is the primary function of the prostomium in an earthworm?
- In a mature earthworm, segments 14, 15, and 16 are covered by a prominent dark band of glandular tissue called the:
- Four pairs of spermathecal apertures are situated on the ventro-lateral sides of the intersegmental grooves in which segments?
- A single female genital pore is present in the mid-ventral line of segment:
- S-shaped setae, embedded in the epidermal pits, are absent in which segments of the earthworm?
- The body wall of the earthworm is covered externally by a very thin non-cellular layer called: