File:PZSL1907Page0761.png

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English: Hypothesis for fish scale evolution.

A. Hypothesized ancestral state
B., D. Hypothesized intermediate states
C. "Rhizodont" scale (lacking cosmine layer)
E. Cosmoid scale
F. "Palaeoniscid" ganoid scale
G. "Lepisosteoid" ganoid scale (lacking cosmine layer)

b. = bony plate, co. = cosmine layer (derived from superficial denticles), ct. = connective tissue, d. = superficial denticles, ep. = epidermis, ga. = ganoine layer, hv. = horizontal vascular canals, is. = isopedine (inner bony laminae), sp. = superficial spines and ridge, vc. = vascular canals.
Date (published 1908)
Source Proceedings of the Zoological Society of London (vol. 1907 issue 4, page 761)
Author "From Lankester's Treatise on Zoology by permission of Messrs. A. & C. Black."
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current23:45, 10 May 2012Thumbnail for version as of 23:45, 10 May 20123,201 × 2,063 (6.9 MB)Rotatebot (talk | contribs)Bot: Image rotated by 90°
17:08, 10 May 2012Thumbnail for version as of 17:08, 10 May 20122,063 × 3,201 (7.01 MB)Dysmorodrepanis (talk | contribs)

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