. Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams. Williams, Ernest E. (Ernest Edward); Herpetology; Evolution. Kinesis in Alligator Lizards • Frazzetta 231. Figure 6. Sequence of tracings of Gerrhonotus specimen III, film 2, from projections. "T" designations show elapsed time in seconds from the first frame shown. tance from the prey toward the Uzard. The head is turned downward, its axis roughly in line with the prey. The delivery phase begins with the mouth closed, and occurs by coordinated movements of the front limbs, forebody, neck and
. Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams. Williams, Ernest E. (Ernest Edward); Herpetology; Evolution. Kinesis in Alligator Lizards • Frazzetta 231. Figure 6. Sequence of tracings of Gerrhonotus specimen III, film 2, from projections. "T" designations show elapsed time in seconds from the first frame shown. tance from the prey toward the Uzard. The head is turned downward, its axis roughly in line with the prey. The delivery phase begins with the mouth closed, and occurs by coordinated movements of the front limbs, forebody, neck and cervicocranial joint. As the delivery progresses, the mandibles are gradually depressed so that the degree of mouth opening increases more or less steadily as the jaws approach their target. Soon after mandibular depression begins, kinetic protraction becomes pro- gressively conspicuous. The muzzle is seen to lift relative to the more posterior regions of the head, and the leading, vertical edge of the eardrum—which cor- responds to the longitudinal axis of the quadrate, to which it is fastened—^be- comes gradually angled forward from a point just above it. The tip of the lower jaw is almost always placed in light contact with the ground, as close to the prey as possible without actually touching it. The preci- sion of this placement is impressive. At the time the lower jaw tip is placed, the upper jaw is clear of prey contact by a substantial margin of distance, and the kinetic mechanism is usually protracted. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Williams, Ernest E. (Ernest Edward); Rhodin, Anders G. J; Miyata, Kenneth; Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : Museum of Comparative Zoology
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