. Bulletin. Natural history; Natuurlijke historie. UW 5485 YPM 41033 YPM 41032 Fig. 24. Partial ontogenetic series of left humerus of Corosaurus alcovensis, based upon UW 5485, YPM 41032, and YPM 41033. (Dodson 1975). Still, it is evident that individuals of Corosaurus occasionally grew to great size. The indeterminate, yet decelerating rate of grow^th of reptiles in general suggests that YPM 41032 represents a long-lived individual. Few other elements of Corosaurus can be directly compared or exhibit as large a size range. Most known vertebrae and ribs from corresponding areas of the axial sk
. Bulletin. Natural history; Natuurlijke historie. UW 5485 YPM 41033 YPM 41032 Fig. 24. Partial ontogenetic series of left humerus of Corosaurus alcovensis, based upon UW 5485, YPM 41032, and YPM 41033. (Dodson 1975). Still, it is evident that individuals of Corosaurus occasionally grew to great size. The indeterminate, yet decelerating rate of grow^th of reptiles in general suggests that YPM 41032 represents a long-lived individual. Few other elements of Corosaurus can be directly compared or exhibit as large a size range. Most known vertebrae and ribs from corresponding areas of the axial skeleton are of similar size. Only one isolated, partial, median gastralium (YPM 41067) is significantly larger than any other. It is approximately cm in maximum anteroposterior breadth versus about 8 mm for average specimens. The five relatively complete femora in the present Corosaurus sample are not greatly divergent in size. They range only from approximately cm in length in YPM 41038 to approximately 15 cm in YPM 41039. Therefore, little mor- phologic variation is present among them. Distally, the tibial condyles are only slightly more pronounced in the larger specimen, whereas proximally the articular head is somewhat larger and joins the internal trochanter at a greater slope. If a femur specimen relatively as large as the aforementioned humerus were known, greater variation, perhaps extending these trends, might be seen. The known girdle elements of Corosaurus are all from animals of approximately equal size and ontogenetic variations cannot be shown. In light of the persistent cartilage of sauropterygian limb girdles, as discussed in Chapter 2, age variation may have been considerable, at least between juvenile stages. Some slight indi- vidual variability, however, is seen in the edges of the ventral plates of the girdles, particularly in the coracoid (Fig. 12C and D). Size may have been correlated with gender as it is in modern crocodilians where the male is ge
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