Invertebrates
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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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Invertebrates

Invertebrates

Octopus Video


Invertebrates

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


Invertebrates

Fishes


Invertebrates

Fishes

  • Class Agnatha – Jawless fish

    • No jaws

    • Unpaired fins and no scales

    • Hagfishes


Invertebrates

Fishes

  • Class Agnatha – Jawless fish

    • Hagfishes


Invertebrates

Fishes

  • Class Agnatha – Jawless fish

    • Lampreys


Invertebrates

Fishes

  • Class Chondrichthyes – Cartilaginous Fishes

    • Includes sharks, rays, skates and ratfish

    • Cartilage skeleton

    • Movable jaws

    • Paired and Unpaired fins

    • Placoid scales


Invertebrates

Fishes

  • Class Chondrichthyes – Cartilaginous Fishes

    • Sharks

      • Fusiform body

      • Heterocal caudal fin

      • Characteristic dorsal fin

      • Gill slits

      • Powerful jaws


Invertebrates

Fishes

  • Class Chondrichthyes – Cartilaginous Fishes

    • Sharks

      • Wide size range


Invertebrates

Fishes

  • Class Chondrichthyes – Cartilaginous Fishes

    • Sharks

      • Very good sensory organs


Invertebrates

Fishes

  • Class Chondrichthyes – Cartilaginous Fishes

    • Sharks

      • Reproduction – live young or eggs


Invertebrates

Fishes

  • Class Chondrichthyes – Cartilaginous Fishes

    • Sharks

      • Commercially hunted


Invertebrates

Fishes

  • Class Chondrichthyes – Cartilaginous Fishes

    • Rays and Skates

    • Dorsally flattened bodies

    • Demersal

    • Ventral gills

    • Modified pectoral fins

      • Stingrays


Invertebrates

Fishes

  • Class Chondrichthyes – Cartilaginous Fishes

    • Rays and Skates

    • Dorsally flattened bodies

    • Demersal

    • Ventral gills

    • Modified pectoral fins

      • Stingrays


Invertebrates

Fishes

  • Class Chondrichthyes – Cartilaginous Fishes

    • Rays and Skates

      • Electric Rays


Invertebrates

Fishes

  • Class Chondrichthyes – Cartilaginous Fishes

    • Rays and Skates

      • Manta Rays


Invertebrates

Fishes

  • Class Chondrichthyes – Cartilaginous Fishes

    • Rays and Skates

      • Skates


Invertebrates

Fishes

  • Class Chondrichthyes – Cartilaginous Fishes

    • Ratfishes


Invertebrates

Fishes

  • Class Osteichthyes – Cartilaginous Fishes

    • Skeleton of bone

    • Make up 96% of all fish

    • Cycloid and ctenoid scales

    • Operculum

    • Homoceral fin


Invertebrates

Fishes

  • Class Osteichthyes – Cartilaginous Fishes

    • Fin rays

    • Terminal mouth

    • Swim bladder


Invertebrates

Fishes - Biology

  • Body Shapes

    • Strongly related to lifestyle


Invertebrates

Fishes - Biology

  • Body Shapes

    • Fusiform

Video


Invertebrates

Fishes - Biology

  • Body Shapes

    • Laterally Compressed

Video


Invertebrates

Fishes - Biology

  • Body Shapes

    • Flattened


Invertebrates

Fishes - Biology

  • Body Shapes

    • Eel-like

Video


Invertebrates

Fishes - Biology

  • Body Shapes

    • Unusual, Irregular

Video


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