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Phylum Chordata (cont.)

Phylum Chordata (cont.). http://funnyxd.com/funnystuff/wp-content/uploads/2007/09/frog_legs_cuisine.jpg. Class Amphibia. http://www.offthemarkcartoons.com/cartoons/1997-02-07.gif. Amphibia = (L) living a double life

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Phylum Chordata (cont.)

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  1. Phylum Chordata(cont.) http://funnyxd.com/funnystuff/wp-content/uploads/2007/09/frog_legs_cuisine.jpg Class Amphibia http://www.offthemarkcartoons.com/cartoons/1997-02-07.gif

  2. Amphibia = (L) living a double life • Considered tetrapods– having 4 muscular limbs and feet with toes and fingers (digits) • 3 main orders: • Order Caudata (salamanders, newts, sirens, etc.) • Order Gymnophiona (Caecilians) • Order Anura (frogs and toads)

  3. Order Caudata • salamanders, newts, sirens • Cauda = (L) tail- possess a tail throughout life • Many toxic species (if ingested) • skin colorations to warn predators • Some able to regenerate a lost limb or tail • Feed on small animals, such as insects, worms, and snails. • Most have internal fertilization • males produce spermatophore, females pick up with cloaca and store in spermatheca • Larvae are similar to adults, but smaller

  4. Salamaders • Smooth, slick and moist skin • Round tail • Most adults terrestrial Newts • Dry, warty skin • Most adults return to an aquatic habitat • Flattened tail • More distinctive differences between the sexes Sirens • No hind legs • Lungs and gills • Spend entire life in/near water

  5. Salamanders http://www.montgomerycountymd.gov/content/dep/herps/photos/salamanders/Eastern_Mud_Salamander_Pseudotriton_mlr.jpg http://fwie.fw.vt.edu/VHS/amphibians/salamanders/seal-salamander/Seal%20Salamander%20(Desmognathus%20monticola).jpg http://www.whatsonsyria.com/mag/images/stories/salamander.jpg

  6. Newts http://www.reptilechannel.com/images/article-images/chinese-newt-500.jpg http://www.bbc.co.uk/wales/nature/img/species/amphibians_reptiles/446x251/gc_newt.jpg

  7. http://www.nwflec.com/sitebuildercontent/sitebuilderpictures/lessersiren.jpghttp://www.nwflec.com/sitebuildercontent/sitebuilderpictures/lessersiren.jpg Sirens http://farm1.static.flickr.com/169/405553426_83c8be4887.jpg?v=0

  8. Order Gymnophiona • Caecilians • Gymnos- (Gr) naked • Worm-like burrowers- NO legs/feet • Appear segmented because of muscle bundles • Feed on worms and other soil invertebrates • Skin covers eyes; most thought to be blind • Fertilization internal • Young emerge from female as mini adults • Some lay eggs

  9. http://farm1.static.flickr.com/76/229268858_fe9385b38b.jpg http://www.reptilesandamphibians.org/images/topics/gymnophiona.jpg http://www.projectmosquitia.com/Dermophis_mexicana.jpg http://i.livescience.com/images/090620-caecilian-02.jpg

  10. Order Anura • frogs and toads (4000 species) • Found mostly in moist environment (some have been found in high latitudes and desert) • Adults lack tail • Hindlimbs long and muscular with webbed feet • Fertilization almost always external with aquatic eggs and larvae • Young are herbivores, adults predators • Some toxic

  11. Frogs • two bulging eyes • strong, long, webbed hind feet that are adapted for leaping and swimming • smooth or slimy skin (generally, frogs tend to like moister environments) • Frogs tend to lay eggs in clusters. Toads • bodies and legs shorter/more stubby (for walking instead of hopping) • warty and dry skin (usually preferring dryer climates) • paratoid (or poison) glands behind the eyes • The chest cartilage of toads is different also. • Toads tend to lay eggs in long chains.

  12. http://its.susd.org/k6/1st/frogvstoad.jpg http://www.casarioblanco.com/poison-dart-frog.jpg

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