Fig. 2. Comparative osteoderm morphology of fossil and extant armadillos, highlighting the structural conservation of body armor across evolutionary time. (A) Extant screaming hairy armadillo (Chaetophractus vellerosus) with inset showing a close-up of its osteoderms. (B) Fossil Glyptodon sp. osteoderm, exhibiting a rosette-like pattern characteristic of glyptodonts. (C–D) Fossil osteoderms of Glyptotherium floridanum, showing variation in surface texture and overall shape. (E–I) Fossil osteoderms of Holmesina floridanus, demonstrating rectangular morphology and diverse surface ornamentation. The arrangement showcases the remarkable continuity in osteoderm shape and function from extinct armored xenarthrans to their modern relatives. Fossil specimens were donated for scanning by T. Stankowich. Chaetophractus vellerosus specimen was donated to M. Paig-Tran from the Orange County Zoo and Scott Weldy, DVM.
Methods used to study these systems—CT scanning, histology, finite element analysis, & mechanical testing—directly influence how the biological principles of armor are defined and understood.
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doi.org/10.1093/icb/...