Across
- 1. cartilage and fish
- 8. sharks and rays
- 13. pointed nose-like extension of the braincase
- 15. major innovation that evolved in vertebrates
- 18. previous called holosteans
- 19. ray-finned fish
- 20. fishes without jaws
- 21. no feet
- 24. mostly fossil lobe-finned fishes
- 25. modern snakes, lizards and ancestors constitute the lepidosaur
- 26. fishes with jaws
- 31. extended flap of skin
- 33. plates and skin
- 34. large group embracing the group of bony fishes
- 35. fleshy finned-fish
- 37. scales covered with cosmine
- 38. snakes and lizards
- 39. spiny forms
Down
- 2. round and mouth
- 3. covered with scales and bony plates
- 4. anterior clustering of specialized sensory organ
- 5. group of tetrapods
- 6. solid cylindrical body encloses the notochord
- 7. spiny root
- 9. rat fishes
- 10. tooth like micro fossils
- 11. encases the embryo in a protective water compartment
- 12. vertebrates with amnion
- 14. openings on the surface of some animals
- 16. bone and fish
- 17. no tail
- 21. vertebrates without amnion
- 22. early shark
- 23. shell and skin
- 27. four-fouted vertebrates
- 28. birds with talons
- 29. external nostril opening
- 30. one of largest ray
- 32. reptiles with two temporal fenestrae
- 36. groups of salamander