Sökning: "Philippe Janvier"
Hittade 1 avhandling innehållade orden Philippe Janvier.
1. Development and three-dimensional histology of vertebrate dermal fin spines
Sammanfattning : Jawed vertebrates (gnathostomes) consist of two clades with living representatives, the chondricthyans (cartilaginous fish including sharks, rays, and chimaeras) and the osteichthyans (bony fish and tetrapods), and two fossil groups, the "placoderms" and "acanthodians". These extinct forms were thought to be monophyletic, but are now considered to be paraphyletic partly due to the discovery of early chondrichthyans and osteichthyans with characters that had been previously used to define them. LÄS MER
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