Bare Bones Pattern Formation: A Core Regulatory Network in Varying Geometries Reproduces Major Features of Vertebrate Limb Development and Evolution
Figure 7
Simulation of fossil limb skeletons.
A selection of limb skeletal patterns from fossil specimens (left), were simulated by employing hypothetical developmental scenarios. The end-stages of the simulations of two lobe-finned fish, Sauripterus and Eusthenopteron, and two forms that are transitional between those organisms and amphibians, Panderichthys and Tiktaalik, are shown on the right. Snapshots of the full hypothetical sequence for the ichthyosaur Brachypterygius are shown in File S5, as are details of the simulations. Drawing of Brachypterygius paddle adapted from [63]; drawings of the fossil fish fins based on [62].