One of the riddles of mammal evolution explained: the strong conservation of the number of trunk vertebrae. Researchers of the Naturalis Biodiversity Center and the University of Utah show that this ...
In Panderichthids (rhipidistian fish ancestors of amphibians), 2 sets of ossifications are present in the centra region. At posterior end, below the neural arch, are pleurocentra. This element gave ...
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