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Figure 2 | Frontiers in Zoology

Figure 2

From: New developmental evidence supports a homeotic frameshift of digit identity in the evolution of the bird wing

Figure 2

Morphological data supports 1, 2, 3 in the bird wing. The evolution of digit morphology is well documented and shows the reduction and loss of digits 4 and 5 in taxa sharing a successively more recent common ancestor with modern birds (from left to right). The digits on the tridactyl wing of mesozoic birds like Archaeopteryx still had the same number of phalanges than digits 1, 2, 3 of dinosaurs and other reptiles.

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