Figure 5. Comparative scheme of the anterior region of chondrocrania in dorsal view, identifying the following structures: light pink = quadratoethmoidal process; yellow = quadratoethmoidal ligamentum; blue = ligamentum quadratoethmoidal condrified; orange = processus lateralis trabeculae; green = olfactory nerve. Hymenochirus boettgeri modified from De Sá & Swart (1999), Pelobates fuscus modified from Roček (1981), Pipa arrabali from this study, Pipa carvalhoi modified from Roček (1990), Pipa pipa modified from Roček & Veselý (1989), Rana temporaria modified from De Jongh (1968), Rhinophrynus dorsalis modified from Sokol (1975) and Swart & De Sá (1999), Xenopus laevis modified from Pugener et al. (2003) and Xenopus tropicalis modified from Sokol (1977).