File:Spindle diagram.jpg

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Spindle_diagram.jpg(734 × 509 pixels, file size: 94 KB, MIME type: image/jpeg)

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English: 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.
Date
Source Own work
Author Petter Bøckman

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Date/TimeThumbnailDimensionsUserComment
current20:21, 4 February 2011Thumbnail for version as of 20:21, 4 February 2011734 × 509 (94 KB)Petter BøckmanSlight cropping
20:12, 4 February 2011Thumbnail for version as of 20:12, 4 February 2011800 × 567 (94 KB)Petter Bøckman{{Information |Description ={{en|1=Evolution of Vertebrate from the Cambrium to the present at a class level as a traditional spindle diagram. The with of the spindle represent number of families, as a rough estimate of diversity. The diagram is based

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