Faidhle:Spindle diagram.jpg

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Spindle_diagram.jpg ‎(734 × 509 pixel, meud an fhaidhle: 94 KB, seòrsa MIME: image/jpeg)

'S ann à Wikimedia Commons a tha am faidhle seo agus faodaidh gu bheil pròiseactan eile 'ga chleachdadh. Chì thu an tuairisgeul a tha aice air [duilleag tuairisgeul an fhaidhle https://commons.wikimedia.org/wiki/File:Spindle_diagram.jpg] gu h-ìosal.


Gearr-chunntas

Tuairisgeul
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. P. 269–303, in Donovan, S. K. and Paul, C. R. C. (eds), The adequacy of the fossil record, Fig. 2. Wiley, New York, 312 p.

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.
Ceann-là
Tùs M’ obair fhèin
Ùghdar Petter Bøckman
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4 dhen Ghearran 2011

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làithreach20:21, 4 dhen Ghearran 2011Dealbhag airson an tionndaidh on 20:21, 4 dhen Ghearran 2011734 × 509 (94 KB)Petter BøckmanSlight cropping
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