Fig. 1. (A) The common toadfish Tetractenos hamiltoni. (B) The weeping toado Torquigener pleurogramma. The colour of the iridescent cornea appears to be different in dark- (DA) and light-adapted (LA) conditions. (C–F) Pigment cover of the corneas of both toadfish during dark- (C,D) and light-adaptation (E,F) during the day and night. The light-adapted T. pleurogramma cornea (F) has a less densely pigmented temporal area, the `pseudopupil' (asterisk). In each case (C–F), the isolated cornea (top) and the cornea with intact pupil (bottom) is shown. There are slight differences between the pigmentation during the night and the day, possibly indicating that there is an underlying diurnal rhythm in pigment migration. D, dorsal, N, nasal orientation.

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