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| Keywords: Spindle diagram.jpg en Evolution of Vertebrate from the Cambrium to the present at a class level as a traditional spindle diagram The width of the spindle represents the number of families as a rough estimate of diversity The diagram is based on Benton M J 1998 The quality of the fossil record of vertebrates Pp 269-303 in Donovan S K and Paul C R C eds The adequacy of the fossil record Fig 2 Wiley New York 312 pp The figures representing classes are from left Agnatha Chondrichthyes Osteichthyes Amphibia Reptilia Aves and Mammalia The two extinct classes are Placodermi and Acanthodii All classes interpreted traditionally Bentons notes to his own tree Number of families is an imperfect measure of diversity Reptilia in particular should probably have been shown as far more diverse in the Mesozoic own Petter Bøckman 2011-02-04 diagram Vertebrata Phylogenetic trees of animals | ||||
