Figure 1 in The comparative osteology and phylogenetic relationships of African and South American lungfishes (Sarcopterygii: Dipnoi)

Figure 1. The articulated skull of Protopterus annectens, AMNH 55226: A, lateral view; B, dorsal view; C, ventral view. Anterior is to the left. Scale bar: 1 cm. DE, dermal ethmoid; EO, exoccipital; FP, frontoparietal; PS, parasphenoid; PT, pterygoid; PTTa, anterior ridge of pterygoid tooth plate; PTTb, middle ridge of pterygoid tooth plate; PTTc, posterior ridge of pterygoid tooth plate; S, supraorbital; SQ, squamosal; V, vomerine tooth.