FIG. 10. Ceratotherium simum AMNH M-51882, Tapirus indicus AMNH M-200300 in Cranial Morphology And Phylogenetic Relationships Of Trigonostylops Wortmani, An Eocene South American Native Ungulate

FIG. 10. Ceratotherium simum AMNH M-51882, Tapirus indicus AMNH M-200300, and Equus caballus AMNH M-204155, reconstructions of endocranial vasculature in dorsal, right lateral, ventral, and caudal views (on this and facing page). Specimens of C . simum and E . caballus are juveniles. For neural features, see text. As in previous figures in this series, vascular-related features are uniformly colored (gray), with exception of arteria diploetica magna (= caudal meningeal artery) (red) in Equus only. Posttemporal trackway contents in other taxa are grouped nonspecifically as vasa diploetica magna. See text. Key: 1, posttemporal sulcus/canal (for vasa diploetica magna); 2, temporal sulcus/canal (for temporal sinus); 3, parietosquamosal sulcus/canal (for parietosquamosal vessels); 4, hypoglossal canal (for condylar emissary vein); 5, sulcus for vertebral vein; 6, sulcus for ventral petrosal sinus (may include part of cavernous sinus); 7, sulcus for sigmoid sinus (may include proximal internal jugular vein); 8, retroarticular sulcus/canal (for retroarticular emissary vein); 9, cranioorbital sulcus/canal (for cranioorbital vessels); 10, sulcus for?ophthalmic vein; 11, sulcus for?caudal rhinencephalic vein; a, sulcus for transverse sinus or sinus communi-