condylobasal length excluding the premaxillae; (1) intermediate, rostral portion between 48 and 70% of modified condylobasal length; (2) elongate, rostral portion >73% modified condylobasal length. 4. (0) its lateral edge in cross section forms an angle of 60º to Anterior half of maxilla: 45º; (1) highly acute angle with flattened maxilla. 5. (0) open, vomer in cross section is V-shaped Vomerine trough, or mesorostral canal: or U-shaped; (1) partially or completely filled with bone, becomes solid rod of bone. 6. (0) absent; (1) present. Rostral constriction well anterior to antorbital notch: 7. (0) wide, rostral width >92% the width across of Width of rostrum at antorbital notch: middle of orbits; (1) fairly wide, between 82% and 72% the width across orbits; (2) narrow, between 68% and 46% the orbital width; (3) very narrow, between 32% and 29% the orbital width. 8. (0) Portion adjacent to and anterior to nasal opening Premaxilla in dorsal view: narrows or remains the same width anteriorly; (1) widens at anterior end. 9. (0) with skull in dorsal view, contact Premaxillae on anterior two thirds of rostrum: along midline for most or entire length; (1) sporadic contact along rostrum; (2) separated by a narrow fissure for entire length; (3) clear separation although mesorostral gutter still has a partial roof; (4) very wide separation, mesorostral gutter is completely open along entire length. 10. (0) suture fused along most of Suture between maxilla and premaxilla on rostrum: rostrum; (1) anterior quarter of rostrum fused with remaining portions unfused; (2) unfused long entire rostrum but articulation tight; (3) suture is unfused and marked by a deep groove.
condylobasal length excluding the premaxillae; (1) intermediate, rostral portion between 48 and 70% of modified condylobasal length; (2) elongate, rostral portion >73% modified condylobasal length. 4. Anterior half of maxilla: (0) its lateral edge in cross section forms an angle of 60º to 45º; (1) highly acute angle with flattened maxilla. 5. Vomerine trough, or mesorostral canal: (0) open, vomer in cross section is V-shaped or U-shaped; (1) partially or completely filled with bone, becomes solid rod of bone. 6. Rostral constriction well anterior to antorbital notch: (0) absent; (1) present. 7. Width of rostrum at antorbital notch: (0) wide, rostral width >92% the width across of middle of orbits; (1) fairly wide, between 82% and 72% the width across orbits; (2) narrow, between 68% and 46% the orbital width; (3) very narrow, between 32% and 29% the orbital width. 8. Premaxilla in dorsal view: (0) Portion adjacent to and anterior to nasal opening narrows or remains the same width anteriorly; (1) widens at anterior end. 9. Premaxillae on anterior two thirds of rostrum: (0) with skull in dorsal view, contact along midline for most or entire length; (1) sporadic contact along rostrum; (2) separated by a narrow fissure for entire length; (3) clear separation although mesorostral gutter still has a partial roof; (4) very wide separation, mesorostral gutter is completely open along entire length. 10. Suture between maxilla and premaxilla on rostrum: (0) suture fused along most of rostrum; (1) anterior quarter of rostrum fused with remaining portions unfused; (2) unfused long entire rostrum but articulation tight; (3) suture is unfused and marked by a deep groove.