. Bulletin. Natural history. Text-fig. 35. Kinesis in mosasaurs. A. Muzzle unit elevated, anterior mandibular unit depressed. B. Cranium at rest. C. Muzzle unit depressed, anterior mandibular unit elevated. merely accentuate the elevation of the muzzle unit in the protracted state by displacing the hypokinetic axis still further anterodorsally. Note that the quad- rates need not have been incorporated into the kinetic mechanism of the mosasaur skull. Streptostyly The term streptostyly is here used to describe the condition in which the quadrate has lost its contact anteriorly with the lower te
. Bulletin. Natural history. Text-fig. 35. Kinesis in mosasaurs. A. Muzzle unit elevated, anterior mandibular unit depressed. B. Cranium at rest. C. Muzzle unit depressed, anterior mandibular unit elevated. merely accentuate the elevation of the muzzle unit in the protracted state by displacing the hypokinetic axis still further anterodorsally. Note that the quad- rates need not have been incorporated into the kinetic mechanism of the mosasaur skull. Streptostyly The term streptostyly is here used to describe the condition in which the quadrate has lost its contact anteriorly with the lower temporal arcade, and is only Icxjsely bound medially to the pter)'goid. The bone is then flexibly sus- pended from the paroccipital process dorsally, and the activation of any muscle attached to it will pivot the element about the quadratic cotylus of the paroc- cipital process. Movement of the quadrate will not necessarily alter the posi- tions of the occipital or remainder of the maxillary segments relative to each 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 Peabody Museum of Natural History. New Haven, Peabody Museum of Natural History, Yale University
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