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Invertebrates

Invertebrates. Octopus Video. Phylum Chordata. C. Vertebrata Share four chordate characteristics + vertebral column (spine, backbone) Spine encloses and protects nerve cord (spinal cord) Anterior end of spinal cord = brain protected by skull made of bone or cartilage 1. Fishes

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Invertebrates

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  1. Invertebrates Octopus Video

  2. Phylum Chordata C. Vertebrata • Share four chordate characteristics + vertebral column (spine, backbone) • Spine encloses and protects nerve cord (spinal cord) • Anterior end of spinal cord = brain protected by skull made of bone or cartilage 1. Fishes • Oldest group of vertebrates (530 mya) • 27,000+ species (15,600+ marine spp.) • Three major groups

  3. Fishes

  4. Fishes • Class Agnatha – Jawless fish • No jaws • Unpaired fins and no scales • Hagfishes

  5. Fishes • Class Agnatha – Jawless fish • Hagfishes

  6. Fishes • Class Agnatha – Jawless fish • Lampreys

  7. Fishes • Class Chondrichthyes – Cartilaginous Fishes • Includes sharks, rays, skates and ratfish • Cartilage skeleton • Movable jaws • Paired and Unpaired fins • Placoid scales

  8. Fishes • Class Chondrichthyes – Cartilaginous Fishes • Sharks • Fusiform body • Heterocal caudal fin • Characteristic dorsal fin • Gill slits • Powerful jaws

  9. Fishes • Class Chondrichthyes – Cartilaginous Fishes • Sharks • Wide size range

  10. Fishes • Class Chondrichthyes – Cartilaginous Fishes • Sharks • Very good sensory organs

  11. Fishes • Class Chondrichthyes – Cartilaginous Fishes • Sharks • Reproduction – live young or eggs

  12. Fishes • Class Chondrichthyes – Cartilaginous Fishes • Sharks • Commercially hunted

  13. Fishes • Class Chondrichthyes – Cartilaginous Fishes • Rays and Skates • Dorsally flattened bodies • Demersal • Ventral gills • Modified pectoral fins • Stingrays

  14. Fishes • Class Chondrichthyes – Cartilaginous Fishes • Rays and Skates • Dorsally flattened bodies • Demersal • Ventral gills • Modified pectoral fins • Stingrays

  15. Fishes • Class Chondrichthyes – Cartilaginous Fishes • Rays and Skates • Electric Rays

  16. Fishes • Class Chondrichthyes – Cartilaginous Fishes • Rays and Skates • Manta Rays

  17. Fishes • Class Chondrichthyes – Cartilaginous Fishes • Rays and Skates • Skates

  18. Fishes • Class Chondrichthyes – Cartilaginous Fishes • Ratfishes

  19. Fishes • Class Osteichthyes – Cartilaginous Fishes • Skeleton of bone • Make up 96% of all fish • Cycloid and ctenoid scales • Operculum • Homoceral fin

  20. Fishes • Class Osteichthyes – Cartilaginous Fishes • Fin rays • Terminal mouth • Swim bladder

  21. Fishes - Biology • Body Shapes • Strongly related to lifestyle

  22. Fishes - Biology • Body Shapes • Fusiform Video

  23. Fishes - Biology • Body Shapes • Laterally Compressed Video

  24. Fishes - Biology • Body Shapes • Flattened

  25. Fishes - Biology • Body Shapes • Eel-like Video

  26. Fishes - Biology • Body Shapes • Unusual, Irregular Video

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