Table 8. Phylogenetically informative discrete characters of vestibular morphology that represent potential synapomorphies of either hominoids or hominids.

Character #	Character definition	Character statesa	Synapomorphic for
#1	Anterior SCb	0 = rounded; 1 = vertically compressed	Hominoidea
#2	Posterior SC	0 = non posteromedially displaced; 1 = posteromedially displaced	Hominoidea
#3	Insertion of the lateral SC slender portion on the vestibule	0 = posterior (lateral SC intersecting the posterior SC plane); 1 = anterior (not intersecting)	Hominoidea
#4	Lateral SC medial portion	0 = curved; 1 = straight	Hominoidea
#5	Trajectory of the lateral SC ampullar portion	0 = flat; 1 = bent upwards	Hominoidea
#6	Angle between the planes identified by the anterior and posterior SCs	0 = close to right angle, 1 = obtuse	Hylobatidae
#7	Inclination and size of the posterior SC relative to the size of the anterior and lateral SCs	0 = forming a right angle and equal or larger in size, 1 = posteriorly tilted and smaller	Hylobatidae
#8	Robusticity of SCs	0 = slender; 1 = stout	Hominidae
#9	Extension of vestibular recesses relative to that of the SCs	0 = smaller; 1 = similar in size	Hominidae

Abbreviations: SC = semicircular canals.

^a Character state 0 represents the primitive condition reconstructed for the last common ancestor of crown catarrhines.

^b Some platyrrhines display a superior eccentricity of the anterior SC that might be apomorphic.