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differed in its origins from that of the lungfish and that the two may have diversified from a true ancestral archipterygium. An alternate origin for tetrapod limbs was identified in the lateral fins by
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and it consisted of a series of rays, one ray large with the remaining small ones attached to the sides of the large one. Gegenbaur based this idea on the fin of
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19:(or ancient fin) is the concept of a primitive limb from which the limbs of tetrapod animals evolved. The idea was proposed by
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Pieretti, Joyce; Gehrke, Andrew R.; Schneider, Igor; Adachi, Noritaka; Nakamura, Tetsuya; Shubin, Neil H. (2015).
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37:. He suggested that the pentadactyl limb of modern tetrapods was derived from one side of the archipterygium.
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Stephens, Trent D.; Strecker, Teresa R. (1985). "Radial
Condensation in the Axis of the Evolving Limb".
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241:"Organogenesis in deep time: A problem in genomics, development, and paleontology"
192:"Insights from sharks: Evolutionary and developmental models of fin development"
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examined the idea and argued against it. He suggested that the tetrapod limb or
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Kerr, J. Graham (1923). "The evolutionary history of the vertebrate limb".
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Science
Progress in the Twentieth Century (1919-1933)
298:Coates, M (2003). "The Evolution of Paired Fins".
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190:Cole, Nicholas J.; Currie, Peter D. (2007).
33:and its similarity to the gill-region in
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156:Coates, Michael I. (1994-01-01).
158:"The origin of vertebrate limbs"
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196:Developmental Dynamics
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