. Bulletin. Natural history; Natuurlijke historie. 42 PEABODY MUSEUM BULLETIN 44. Fig. 23. Immature specimen of Keichousaurus in the collection of the Institute of Vertebrate Pale- ontology and Paleoanthropology, Beijing, exhibiting juvenile body proportions. Scale in one-sixteenths of an inch ( mm). Photo courtesy of N. Mateer. probable ontogenetic, variation in Corosaurus is associated with the humeri of six separate individuals. These range from approximately 9 to 21 cm in length (Fig. 24). Volumetrically, the largest known humerus of Corosaurus (YPM 41032) is approximately times lar
. Bulletin. Natural history; Natuurlijke historie. 42 PEABODY MUSEUM BULLETIN 44. Fig. 23. Immature specimen of Keichousaurus in the collection of the Institute of Vertebrate Pale- ontology and Paleoanthropology, Beijing, exhibiting juvenile body proportions. Scale in one-sixteenths of an inch ( mm). Photo courtesy of N. Mateer. probable ontogenetic, variation in Corosaurus is associated with the humeri of six separate individuals. These range from approximately 9 to 21 cm in length (Fig. 24). Volumetrically, the largest known humerus of Corosaurus (YPM 41032) is approximately times larger than the humeri of the holotype. Progressive allometric changes occur most notably in the proximal and distal ends of each humerus in the sample and have been described above for the largest example (Chapter 3). Progressively thinner articular cartilages are assumed as described by Haines (1969) for recent reptiles, principally crocodilians and chelonians. The curvature and relative thickness of the humeral shaft remain constant throughout the sample but the ventral surface becomes increasingly "; As the type individual of Corosaurus is estimated to have been approximately 165 cm in total length, and assuming a crude 1:1 humerus length/total length scaling ratio, the large Corosaurus humerus may have belonged to an animal approaching m long. This is the size reported by Peyer (1939) for the type of Paranothosaurus and is in the range of some Nothosaurus specimens. At least in crocodilians, however, relative limb size does not remain constant throughout ontogeny but is negatively allometric (Kalin 1955), although relative propodial size increases. 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 : The Museum
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