| character | plesiomorphic/apomorphic |
|---|---|
| Characters 1 to 8, 10, and 17 to 20 discussed in text, characters 9 and 11 to 16 from Currie (1987). | |
| 1. premaxillary teeth D-shaped in section | a |
| 2. premaxillary teeth not serrate | p |
| 3. premaxillary teeth with low ridge on posterior face | a |
| 4. cheek teeth relatively large (with respect to depthof muzzle and jaw) | p |
| 5. muzzle long and low | p |
| 6. frontals longer than wide | p |
| 7. two or three prongs of nasal overlap frontal | a |
| 8. dorsolaterally directed prefrontal contact on frontal | p |
| 9. socket for prefrontal on frontal | p |
| 10. elongate contact for prefrontal on frontal | p |
| 11. orbital rim on frontal very short | p |
| 12. frontal-prefrontal suture expanded | p |
| 13. pronounced buttress at frontal-postorbital contact | p |
| 14. parietal process separates frontal posteriorly | p |
| 15. sagittal crest extends onto frontals | p |
| 16. frontals essentially flat between orbits | p |
| 17. nasals smooth | p |
| 18. anterior margin of antorbital fossa v-shaped | p |
| 19. acute angle of premaxillary-maxillary contact withventral margin of snout | p |
| 20. ventral margin of symphysis only slightly inclinedto horizontal | p |