Phylum: Chordata

It includes the most higher animals in the Animal Kingdom
The embryos are charaterized by the presence of
1. a skeletal sturcture at its dorsal region
  1. the notocord
    1. persists throughout its whole life
    2. converted into a vertebral column in the majority of chordates
SUB-PHYLUM: VERTEBRATA
1. Notochord first appears in vertebrates in the embryonic stage
  1. is replaced as the embryo develops by the vertebral column
    1. surrounds and protects the spinal chord
2. They have an endoskeleton
  1. vertebral column
  2. skull
  3. girdles
  4. limbs
3. They have a heart
  1. several chambers
4. Blood that flows inside blood vessles in a closed circulation
  1. To feed all body organs with oxygen and nurtrients
5. CLASSIFICATION INTO CLASSES
  1. Agnatha
    1. Endoskelelton
      1. cartilagenous
    2. The Body
      1. thin
      2. long
      3. eel-like
      4. with no paired fins
    3. The mouth
      1. circular, funnel-shapped
        contains a rough tongue
        provided with many horny teeth
      2. jawless
    4. Feeding
      1. Parasites
        they stick by their mouth into big fish and attach themselves by their teeth
        Then, they snap the flesh of these fishes by their rough tongue
        which is similar to the rasp
    5. Example
      1. LAMPREY
  2. chondrichthyes
    1. Habibtat
      1. salt waters like seas
    2. Endoskeleton
      1. cartilagenous
    3. The body
      1. covered with scales similar to teeth
    4. mouth
      1. ventral
        it lies on the ventral surphace of head
      2. provided with 2 jaws
        carry several rows of teeth helping them in predation
    5. fins
      1. Are paired
    6. Gill slits
      1. they are uncovered by an operculum
    7. Air bladder
      1. NONE
    8. The sex
      1. unisexual (separate)
    9. Fertilization
      1. internal
    10. Examples
      1. sharks
      2. Ray
  3. osteichthyes
    1. Habitat
      1. salt water
      2. fresh water
    2. endoskeleton
      1. bony
    3. The body
      1. covered with bony scales
    4. The mouth
      1. terminal
        anterior tip of the body
    5. Gill slits
      1. covered with an operculum
    6. Air bladder
      1. have a bladder
        helping them in swimming and floating
    7. the sex
      1. unisexual
    8. fertilzation
      1. external
    9. examle
      1. Bouri
      2. Bolti
    10. fins
      1. medial & paired

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Phylum: Chordata

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	Created by Remochii 116 about 9 years ago