In fish, the pelvic fins bear no weight and the pelvic girdle is not attached to the axial skeleton. In amphibians, the pelvic girdle is attached to one vertebra. In the early reptiles, the pelvic ...
It is stated that the skeleton of the living fish was found to be cartilaginous and the vertebral column apparently tubular. In the fossils the central part of the vertebral column has disappeared ...
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