Secondary Cartilage Revealed in a Non-Avian Dinosaur Embryo

Abstract

The skull and jaws of extant birds possess secondary cartilage, a tissue that arises after bone formation during embryonic development at articulations, ligamentous and muscular insertions. Using histological analysis, we discovered secondary cartilage in a non-avian dinosaur embryo, Hypacrosaurus stebingeri (Ornithischia, Lambeosaurinae). This finding… (More)
DOI: 10.1371/journal.pone.0056937

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