phylum chordata n.
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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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characteristics of chordates
Characteristics of Chordates
  • Notochord
  • Dorsal nerve cord
  • Pharyngeal pouches or gill slits
  • Postanal tail
slide3
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
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