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This analysis quantitatively and qualitatively examines histological and morphological variation of osteoderms from extant and extinct alligatoroid specimens. Statistically significant differences were correlated with changes in osteoderm size and shape. These differences are independent of position on the body, taxonomy, or evolution. Histological variation in alligatoroid osteoderms is due to morphological constraints on the elements themselves, and not taxonomic differences. This has implications for the recognition of histological characters in the osteoderms of extinct archosaur groups that lack extant representatives. J. 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