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Fig. 1. (A,C) Morphological landmarks used. (1) Tip of premaxilla, (2) tip of dentary, (3) quadrate-articular joint, (4) anterior base of dorsal fin, (5) anterior base of pelvic fin, (6-9) orbit, (10-13) pupil, (14) leading edge base of pectoral fin, (15) trailing edge base of pectoral fin, (16) leading tip of pectoral fin, (17) middle edge of pectoral fin, (18) trailing tip of pectoral fin, (19) food item. (B,D) Kinematic variables calculated from morphological landmarks: distance to prey (a), body angle of approach (b), gape (c) and gape angle (d), jaw protrusion (e), cranial elevation (f), fin abduction (g), fin protraction (h). Solid lines indicate distances, broken lines indicate angles. (C) Morphological landmarks plotted to estimate the center of the orbit and pupil; (D) pupil vector (distance and angle) measured using the estimated centers.





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