survey of animals from the phylum chordata n.
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Survey of Animals from the Phylum Chordata. Sub Phylum Vertebrata. Common Chordate Features. All Chordates, at some point in their lives have four features: (Click). Notochord: a rod of stiffened tissue supporting the body (later develops into bony units comprising the vertebral column).

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common chordate features
Common Chordate Features

All Chordates, at some point in their lives have four features:(Click)

  • Notochord: a rod of stiffened tissue supporting the body (later develops into bony units comprising the vertebral column).
  • Dorsal Nerve Chord: located just above the notochord and gut region (protected by vertebrae after full development)
  • Muscular Pharynx: the entrance to the digestive tract (with small gill slits)
  • Tail (or rudiment thereof): located near the anus
key characteristics click to continue
Key Characteristics: Click to Continue
  • Body Temperature Regulation
    • Ectotherm: body changes temperature in response to external environment
    • Homeotherm: temperature remains constant regardless of external environment
  • # Of Heart Chambers
    • Two: (atrium/ventricle) allows for mixing of deoxygenated & oxygenated blood
    • Three: (2 atria/1 ventricle) more efficient separation of deO2 & O2 blood
    • Four: (2 atria/2 ventricles) complete separation of deO2 & O2 blood
  • Respiratory Organs (Exchange of 02 & CO2)
    • Lungs, Gills, Skin: moist membranes designed for gas exchange in/out of blood
  • Reproductive Structures (Embryo Development)
    • Internal Amniotic Egg: develops inside of mother and contains amnion/amniotic fluid
    • External Amniotic Egg: develops outside of mother and contains amnion/amniotic fluid
    • Aquatic Egg: contains no amnion and develops in a liquid (aquatic) environment
  • Excretory Mechanisms (H2O Conservation)
    • Urea: liquid waste released by specialized excretory structures (toxic if accumulates)
    • Uric Acid: solid waste (conserves H2O, non-toxic, & therefore can be stored)
class pisces fish
Class Pisces (Fish)

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class amphibia
Class Amphibia

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class reptilia
Class Reptilia

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class aves birds
Class Aves (Birds)

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class mammalia
Class Mammalia

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