What does the Tiktaalik wrist look like?
what do the distal elements of the Tiktaalik look like?
what do the distal elements of the Tiktaalik look like?
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Tiktaalik's wristed fin included the basic set of bones we know as the single bone (humerus), then a pair of bones (radius and ulna), next a series of wrist bones (carpals) and finally a set of digits (phalanges). The bones differed in proportions but there is a basic bone for bone homology in the limbs, skull and spine. The other novel adaptation was the mobile neck
https://docs.google.com/viewer?a=v&q=cac…
http://www.npr.org/templates/story/story…
http://www.devoniantimes.org/Order/re-ti…
Mobile neck
http://chronicle.uchicago.edu/081023/tik…
https://docs.google.com/viewer?a=v&q=cac…
http://www.npr.org/templates/story/story…
http://www.devoniantimes.org/Order/re-ti…
Mobile neck
http://chronicle.uchicago.edu/081023/tik…
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Have a look at this illustration.
Cladogram of the pectoral fins on the tetrapod stem, from Ref. 3.
Cladogram of the pectoral fins on the tetrapod stem, from Ref. 3.