Amphibia[1]

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  • Amphibia[1]

    1. 2. Class Amphibia
    2. 3. Class Amphibia <ul><li>Includes caecilians, salamanders, frogs, and toads, newts </li></ul><ul><li>More than 5,400 species </li></ul><ul><li>Live in moist habitats </li></ul><ul><li>Transition from WATER to LAND </li></ul><ul><li>Many species are greatly threatened </li></ul>
    3. 4. What about their habitat? <ul><li>Found on every continent except Antarctica </li></ul><ul><li>Typically near water </li></ul><ul><li>Reproduction </li></ul><ul><ul><li>Eggs without shell </li></ul></ul>
    4. 5. A threatened group <ul><li>Population crashes and mass extinctions </li></ul><ul><li>Causes? </li></ul>
    5. 6. Starting on the outside. . . <ul><li>SKIN </li></ul><ul><li>Ectotherms </li></ul><ul><li>Protection and respiration </li></ul><ul><li>Mucous - lubricates and protects from predators </li></ul><ul><li>Indicator of ecosystem health </li></ul>
    6. 7. Frog Legs Anyone? <ul><li>Powerful hind legs </li></ul><ul><li>Strong bones and muscles </li></ul><ul><li>Able to leap many times their body length </li></ul><ul><li>4 legs - tetrapods </li></ul>
    7. 8. Frog Senses <ul><li>SIGHT </li></ul><ul><ul><li>Eyes work equally well in and out of water </li></ul></ul><ul><ul><li>Nictitating Membrane </li></ul></ul><ul><li>SOUND </li></ul><ul><ul><li>Tympanic Membrane </li></ul></ul>
    8. 9. Order Anura “without a tail” <ul><li>Frogs and Toads </li></ul><ul><ul><li>Live in a variety of habitats </li></ul></ul><ul><ul><li>Most frogs spend part of lives in water </li></ul></ul><ul><ul><li>Larvae - tadpoles </li></ul></ul><ul><ul><li>Toads typically have rough bumpy skin </li></ul></ul>
    9. 10. Order Urodela “visible tail” <ul><li>Salamanders </li></ul><ul><ul><li>Elongated bodies, long tails, 2 prs of legs </li></ul></ul><ul><ul><li>Most are found in N and S America </li></ul></ul><ul><ul><li>Smooth moist skin </li></ul></ul><ul><ul><li>Lungless salamanders - largest group </li></ul></ul><ul><ul><ul><li>Gills, lungs, both, or none </li></ul></ul></ul>
    10. 11. Order Apoda “no legs” <ul><li>Caecilian </li></ul><ul><ul><li>Legless amphibians </li></ul></ul><ul><ul><li>Most are found in tropical areas </li></ul></ul><ul><ul><li>Rarely seen - little known about behavior </li></ul></ul><ul><ul><li>Nearly blind </li></ul></ul>

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