1. dinosaur
2. ichthyosaur
3. plesiosaur
4. synapsid
5. thecodont
6. pterodactyl
7. plesiosaurus
8. synapsid reptile
9. therapsid
10. nothosaur
11. pterosaur
12. flying reptile
13. anapsid
14. anapsid reptile
15. elasmosaurus
16. saurian
17. archosaur
18. archosaurian
19. archosaurian reptile
20. eosaurus
21. morganucodon
22. ichthyosauria
23. pterosauria
24. lizard
25. coelacanth
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26. dicynodont
27. saurischia
28. therapsida
29. ictodosauria
30. mosasaurian
31. order ichthyosauria
32. order ictodosauria
33. order pterosauria
34. order saurischia
35. order sauropterygia
36. order thecodontia
37. order therapsida
38. pliosaurus
39. proterosaurus
40. sauropterygia
41. subclass synapsida
42. synapsida
43. thecodontia
44. horn
45. crocodile
46. crocodilian
47. reptilian
48. archaeornis
49. labyrinthodonta
50. clidastes
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51. dolichosaurus
52. enaliosauria
53. labyrinthodontia
54. mosasaur
55. ornithosauria
56. orthopoda
57. plesiosauria
58. superorder labyrinthodonta
59. superorder labyrinthodontia
60. teleosaurus
61. theriodontia
62. anapsida
63. order ornithischia
64. ornithischia
65. ornithoscelida
66. subclass anapsida
67. cheirotherium
68. ichthyosaurus
69. labyrinthodont
70. crocodilia
71. mosasaurus
72. dinosauria
73. mosasauria
74. snake
75. tuatara
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76. ophidian
77. family hadrosauridae
78. genus corythosaurus
79. genus titanosaurus
80. hadrosauridae
81. titanosaurus
82. basilisk
83. chelonian
84. alligator
85. thecodont reptile
86. ceratopsidae
87. dimetrodon
88. dromaeosauridae
89. family ceratopsidae
90. family dromaeosauridae
91. family titanosauridae
92. genus allosaurus
93. genus anatotitan
94. genus ankylosaurus
95. genus antrodemus
96. genus apatosaurus
97. genus barosaurus
98. genus brontosaurus
99. genus ceratosaurus
100. genus coelophysis
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