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What senses do earthworms use to respond to light and touch?
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annelid
The structure of polychaetes. (Left) Free-moving polychaetes. (A) Neanthes, (B) Nereis. (Right) Tube-dwelling (sedentary) polychaetes. (C) Amphitrite, (D) Sabella.
Earthworms do not possess the ability to see or hear, yet they are highly responsive to their environment through other sensory mechanisms.1
Regarding their response to light and touch:
- Light: Although earthworms lack eyes, they are sensitive to light. They possess sensory capabilities that allow them to detect and react to light exposure, which is essential for their survival in soil environments.12
- Touch: Earthworms are sensitive to vibrations and direct tactile stimulation. Like many other annelids, they utilize subcutaneous receptors—consisting of free nerve endings—located within the skin to perceive contact with solid objects. These receptors are part of a broader mechanoreception system that allows the worm to interact with its surroundings. Additionally, their nervous system includes a subepidermal nerve plexus that covers the entire body, facilitating the perception of external stimuli.132