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| Description: A phylogenetic history of snakes shows the gradual loss of limbs from their reptilian ancestors. Species in the superfamily Booidea (boas and pythons) retain vestigial hind limbs, whereas developmental changes in the colubrid snakes have eliminated even these vestigial hind limbs. Adapted from Cohn and Tickle (1999). Picture Stats: Views: 2462 Filesize: 229.28kB Height: 900 Width: 1162 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=5315 |