Figure 8 from: Slater G, Scheel D, Kolokotronis S, Potter C, Rotstein D, Tsangaras K, Greenwood A, Helgen K (2014) Biogeography and taxonomy of extinct and endangered monk seals illuminated by ancient DNA and skull morphology. ZooKeys 409: 1-33. https://doi.org/10.3897/zookeys.409.6244

Figure 8 - Ventral views of crania of a Monachus monachus b Neomonachus schauinslandi, and c Neomonachus tropicalis, showing the pterygoid region. Neomonachus exhibits a well-developed, laterally flared pterygoid hamulus that is visible in dorsal view. The hamulus may be spatulate (Neomonachus schauinslandi) or hook-like (Neomonachus tropicalis). The hamular process is absent or medially flared in Monachus, and is not visible in dorsal view.