Fig. 47

Neural spine length ratio in YPM populations of “Palaeopython” neglectus and Phosphoroboa filholii comb. nov. compared to same ratio in type material of various Paleogene constrictors from Europe. There is no overlap between the two YPM populations. That Palaeopython cadurcensis and “Palaeopython” neglectus are virtually identical is remarkable considering that the neural spine extends far out onto the zygosphenal tectum in the latter species