Fig. 6. Two contrasting pterosaur phylogenies. A in The extent of the pterosaur flight membrane

Fig. 6. Two contrasting pterosaur phylogenies. A. Phylogeny from Lü et al. (2009). B. A simplified version of that presented by Wang et al. (2005). Thick black lines indicate species or groups of taxa for which the fossil evidence supports an ankle attachment of the wing.