Reconstruction of the relative timing of forelimb and hindlimb development in tetrapods. Branches in blue and green show cases of significant hindlimb versus forelimb advances, respectively. Branches in red indicate synchrony and branches in black are equivocal according to the parsimony reconstruction. The tree is derived from references 33 and 34.
Bininda-Emonds et al. BMC Evolutionary Biology 2007 7:182 doi:10.1186/1471-2148-7-182