Tabl. 2 in The Jordan theropod (Maastrichtian, Montana, U. S. A.) referred to the genus Aublysodon

Tabl. 2 - Characters used in determining the relationships of Aublysodon. Caractères utilises pour determiner la position systématique Ae Aublysodon. characterplesiomorphic/apomorphic1. premaxillary teeth D-shaped in sectiona2. premaxillary teeth not serratep3. premaxillary teeth with low ridge on posterior facea4. cheek teeth relatively large (with respect to depthof muzzle and jaw)p5. muzzle long and lowp6. frontals longer than widep7. two or three prongs of nasal overlap frontala8. dorsolaterally directed prefrontal contact on frontalp9. socket for prefrontal on frontalp10. elongate contact for prefrontal on frontalp11. orbital rim on frontal very shortp12. frontal-prefrontal suture expandedp13. pronounced buttress at frontal-postorbital contactp14. parietal process separates frontal posteriorlyp15. sagittal crest extends onto frontalsp16. frontals essentially flat between orbitsp17. nasals smoothp18. anterior margin of antorbital fossa v-shapedp19. acute angle of premaxillary-maxillary contact withventral margin of snoutp20. ventral margin of symphysis only slightly inclinedto horizontalp Characters 1 to 8, 10, and 17 to 20 discussed in text, characters 9 and 11 to 16 from Currie (1987).表2 — 用于确定奥氏齿龙（Aublysodon）亲缘关系的形态特征。用于确定奥氏齿龙系统分类位置的特征。 1. 前颌齿（premaxillary teeth）横截面呈D形 2. 前颌齿无锯齿 3. 前颌齿后缘具低矮脊突 4. 颊齿（cheek teeth）相对较大（相对于吻部与颌骨深度而言） 5. 吻部修长低矮 6. 额骨（frontal）长大于宽 7. 鼻骨（nasal）的2或3个突起与额骨（frontal）重叠 8. 额骨（frontal）上的眶前骨（prefrontal）接触面指向背外侧 9. 额骨（frontal）上存在眶前骨（prefrontal）窝 10. 额骨（frontal）上的眶前骨（prefrontal）接触面延长 11. 额骨（frontal）上的眶缘极短 12. 额骨（frontal）-眶前骨（prefrontal）接缝处扩张 13. 额骨（frontal）与眶后骨（postorbital）连接处具显著支撑脊 14. 顶骨（parietal）突在后方分隔额骨（frontal） 15. 矢状嵴（sagittal crest）延伸至额骨（frontal） 16. 眶间区额骨（frontal）基本平坦 17. 鼻骨（nasal）表面光滑 18. 眶前窝（antorbital fossa）前缘呈V形 19. 前颌骨（premaxillary）-上颌骨（maxillary）连接处与吻部腹缘形成锐角 20. 下颌联合部（symphysis）腹缘仅略微偏离水平方向 特征1至8、10以及17至20已在正文中讨论，特征9及11至16的资料引自Currie（1987）。