This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Origin of Vertebrates Fig . Fig Skeleton of Petromyzon From Parker na nasal capsule au auditory capsule nc notochord All references in this work to Ammoctes or Petromyzon appear to refer to the European Brook Lamprey now called Lampetra planeri The Origin of Vertebrates org Walter Holbrook Gaskell PDoldauto Origin of Vertebrates