Fig. 3. Endoscopic images illustrating a typical sequence observed during feeding on slurry particles off a gravel substrate (125 frames s^-1; duration of sequence 104 ms; frames 1, 6 and 13 shown). The anterior of the fish is to the left. Rows of gill rakers on ceratobranchials I—IV (cb I—IV) are visible, as well as the palatal organ (po). (A) A rock (r) is pressed down and pinned by the palatal organ across cb IV. (B) A slurry particle (p) and (C) a brine shrimp cyst (p) travel posteriorly past the rock and do not come into contact with any pharyngeal surface while in the field of view. Movie available online (movie: fig3.mov).

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