Calcification of early vertebrate cartilage

Philippe Janvier () and Marius Arsenault
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Philippe Janvier: CNRS, UMR 8569, Muséum National d'Histoire Naturelle
Marius Arsenault: Parc de Miguasha

Nature, 2002, vol. 417, issue 6889, 609-609

Abstract: Abstract Hagfish and lampreys are unusual for modern vertebrates in that they have no jaws and their skeletons are neither calcified nor strengthened by collagen — the cartilaginous elements of their endoskeleton are composed of huge, clumped chondrocytes (cartilage cells). We have discovered that the cartilage in a 370-million-year-old jawless fish, Euphanerops longaevus, was extensively calcified, even though its cellular organization was similar to the non-mineralized type found in lampreys. The calcification of this early lamprey-type cartilage differs from that seen in modern jawed vertebrates, and may represent a parallel evolutionary move towards a mineralized endoskeleton.

Date: 2002
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DOI: 10.1038/417609a

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