Transformation of Saguinus oedipus sphenoid bone comparing newborn (A, C) and one-month-old (B, D) displaying different components of bone. Images presented in ventral (top row) and slight anterolateral view (bottom row). Further abbreviations: alis, alisphenoid; amfo, anterior margin foramen ovale; bs, basisphenoid; mpp, medial pterygoid plate; lpp, lateral pterygoid plate; ph, pterygoid hamulus; ps, presphenoid; oc: optic canal; os, orbitosphenoids; pc, pterygoid canal; fr, foramen rotundum. Scale bars, 1.5 mm.