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GRAVITY AND LIGHT INFLUENCE THE COUNTERSHADING REFLEXES OF THE CUTTLEFISH SEPIA OFFICINALIS

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Figure

Fig. 1. The statocysts of the cuttlefish Sepia officinalis lie in the cranial cartilage underneaththe brain (dotted area in top diagram)
Fig. 2. The roll countershading reflex of Sepia officinalis. (A) Rotation through less thanapproximately 90 ˚ elicits component A: expanded chromatophores on the uppermost latero-ventral side of the animal
Fig. 3. The pitch countershading reflex of Sepia officinalis. (A) When the animal is head up,chromatophores on the anterior ventral surface of the body expand
Table 1. Effects of destroying gravity and angular acceleration receptor systems on theroll and pitch countershading reflexes (CSRs) of Sepia

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