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Fig. 3. Schematic figure of the skull kinematics of Pomacanthus
semicirculatus, illustrating the three significant phases of a
grab-and-tearing feeding event. (A) Jaw apparatus prior to protrusion onset,
(B) protruded, and (C) protruded-closed state (upon jaw retraction, C returns
to A after the recovery phase, in preparation for the next feeding event).
Colour coding: grey, neurocranium, red, oral jaws, yellow, maxilla, blue,
suspensorium, green, opercular series and articular. Arrows indicate
displacement, mediated by tendons and ligaments. Open circles indicate
rotation and filled circles indicate passive linkage. Cones represent inferred
contraction of a muscle group, with myology labelling as in
Fig. 2. HPAX: hypaxialis
musculature.