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Acanthostega gunnari

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Scan day: 17 February 2014 UTC
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Description: A detailed analysis of this early tetrapod by Jennifer Clack, the paleontologist who discovered and described it.
Click on an image to view larger version & data in a new window (Jarvik 1952) is one of a small but increasing number of genera of stem-tetrapods known from the Upper Devonian, which are providing an expanding view of the appearance of tetrapods and the origin of limbs with digits (Coates and Clack 1990, Clack and Coates 1995, Gould 1991, Pough et al. 1996, Thomson 1993, Zimmer 1995, Clack 2002a).
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