what is the external feature of earthworm and corkroach
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That it take the oxygen through skin and it is called cutaneous respiration
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The external features (morphology) of earthworm :
- Earthworms have long, narrow, cylindrical body.
- Their body is divided into short and similar segments.
- These similar segments are known as metameres. They are about 100 to 120 in number.
- These metameres divide body both externally and internally, such type of segmentation is called metameric segmentation or metamerism.
- These segments are separated from each other by distinct ring-like grooves or annuli.
- The dorsal surface of their body is recognised by a dark median/mid-dorsal line, which is in fact a dorsal blood vessel beneath the skin.
- Their ventral surface can be recognised by the presence of genital apertures (pores).
- The earthworms do not possess a distinct head nor any specialised sense organs-like eyes or ears.
- So, the anterior end of these worms consist of mouth and the prostomium.
- Mouth is a crescentric aperture at the anterior end of first segment. This segment is known as peristomium (or buccal segment).
- The dorsal edge of peristomium projects forward above the mouth, as a small fleshy lobe called prostomium which serves as covering for the mouth. It is used as a muscular probe in burrowing. It is also sensory in function.
- Other external features of earthworm include – presence of clitellum, setae and various apertures
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