1. Fishes
Phylum Chordata

2. Review: Chordates 500 mya Evolved from invertebrate chordates
Chordates Begin!!!

6. Post-anal Tail
Cat Human

7. Vertebrates Vertebrates differ from chordates because of BACKBONE
Backbone = vertebral column or spine
Made of vertebrae
Encloses & protects nerve cord

8. Fishes

9. Fish vs. Fishes
Fish – single individual OR more than 1 individual of the same species
Fishes –more than one species

10. Fish Oldest & Most Primitive Vertebrates
30,000 species; half the living vertebrates on earth
$$$ Important to Economy

11. Classification

12. Class Agnatha Jawless Fishes Most primitive Feed by suction
Have round muscular mouth
Body: Long, Lack fins, Lack scales
Types:
Hagfish - Detritivores
Lamprey - Parasitic

13. Fresh Bait Left in Ocean
6 Hours Later
Fresh Bait Left in Ocean

16. Class Chondrichthyes

17. Class Condrichthyes Cartilaginous fish Advanced Features: Types Sharks
Movable jaws
Ventral mouth
Paired Lateral Fins
Types
Sharks
Fast swimmers
Sharp teeth, rows
Skate and Rays
Flattened bodies
Spine on tail
Ratfish
Deep water
Flap of skin to protect gills

18. Class Condrichthyes - Sharks

19. Hammerhead Sharks

20. Sawshark

21. Thresher shark

22. Spiny Pygmy Shark

23. Whale Shark

24. Class Condrichthyes – Rays and Skates

25. Manta Ray

26. Class Condrichthyes – Ratfish

27. Class Osteichthyes

28. Class Osteichthyes Bony Fish Skeleton at least partially bone
21,500 species = 98 % of all fish
About 50% of all vertebrates
2 Classes:
Actinopterygii - Ray-finned fish
Sarcopterygii - Lobe finned fish

29. Lobe-finned
Ray-finned

30. Osteichthyes Adaptations
Mouth
Mouth is almost always terminal
Teeth not in rows
Swim Bladder - Gas filled sac that regulates buoyancy
Skin
Thin flexible scales
Scales covered in layer of tissue
Tissue covered with mucus
Operculum – gill cover

31. External Anatomy

33. Elements Page