Phylum chordata
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Phylum Chordata. Characteristics of Chordates. Notochord Dorsal nerve cord Pharyngeal pouches or gill slits Postanal tail. Subphylum Cephalocharodata- This subphylum is composed of about 2 dozen blade-shaped animals known as lancelets. They retain all characteristic throughout life.

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Phylum Chordata

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Phylum chordata

Phylum Chordata


Characteristics of chordates

Characteristics of Chordates

  • Notochord

  • Dorsal nerve cord

  • Pharyngeal pouches or gill slits

  • Postanal tail


Phylum chordata

Subphylum Cephalocharodata- This subphylum is composed of about 2 dozen blade-shaped animals known as lancelets. They retain all characteristic throughout life.

Subphylum Urochordata- This subphylum is commonly known as tunicates ( sea squirts). Larva posses all chordate characteristics while adults exhibit only Pharyngeal pouches.


Subphylum vertebrata

Subphylum Vertebrata

  • All characteristics of chordates

  • Distinguishing characteristics

    • Vertebral column or spine

    • Cranium or skull that protects the brain

    • Endoskeleton composed of bone or cartilage


Major groups of vertebrates

Major groups of Vertebrates


Lampreys and hagfishes

Lampreys and Hagfishes

  • Long, eel-like bodies

  • Lack jaws

  • Paired fins

  • bones


Sharks skates and rays

Sharks, Skates and Rays

  • Class Chondrichthyes

    • Jaws

    • Paired fins

    • Skeleton of cartilage


Boney fishes

Boney Fishes

  • Class Osteichthyes

    • Jaws

    • Most have a skeleton composed of bone


Amphibians

Amphibians

  • Class Amphibia

    • Included frogs, toads and salamanders

    • Skin is moist and permeable to gases and water

    • Most lay eggs in water

    • Most have an aquatic larval stage


Reptiles

Reptiles

  • Class Reptilia

    • Turtles, crocodiles, alligators, lizards and snakes

    • Skin is dry and scaly

    • Eggs that can be laid on land


Birds

Birds

  • Class Aves

    • Adapted for flight

      • Feathers

      • Hollow bones

      • Unique respiratory system


Mammals

Mammals

  • Characteristics

    • Endothermy

    • Hair

    • Completely divided four chamber heart

    • Milk produced from mammary gland

    • Single jawbone

    • Specialized teeth


Order monotremata

Order Monotremata

  • Egg-laying mammals

  • Most primitive of mammals

  • Only three species

    • Two anteaters and one platypus


Order marsupialia

Order Marsupialia

  • 250 species

  • The U.S. has only one species – the Virginia opossum

  • Young develop in a pouch


Placental mammals

Placental Mammals

  • Diverse group composed of at least 18 orders

  • 95% of mammals are placental

  • They live on land, in water and the air


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