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Related Flashcards
Related Topics
Cards In This Set
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Animal Origins
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-choanoflagellates: simple protists
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Body Symmetry
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-radial symmetry: life from all sides-bilateral symmetry: "head end" "left & right side", move through environment
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Phylum Cnidaria (stinging)
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-sea anemones, jellies, corals, hydras-cnidocytes: "stinging cells", capture prey -radial symmetry-two germ layers: ectoderm and endoderm
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True tissue layers
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-blastula formed after fertilization of the egg by sperm -ectoderm, endoderm
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Cnidae
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The unique stinging cells of cnidarians
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Phylum Platyhelminthes (Flat)
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-flatworms: planarians, flukes, tapeworms-many free-living but lots of different parasits are in the phylum
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Phylum Nematoda--Roundworms
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-one of the most abundant animal groups -also includes many parasites of plants and animals
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Nematode Locomotion
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-longitudinal muscles can contract on dorsal and ventral surfaces only -produces a distintive oscillating wiggling motion
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Ascaris
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-a parasite of human intestines -in contaminated food-eggs hatch in intestine, larvae migrate throughout body
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Endoderm
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Lungs, lining of gut, many organs like liver
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Mesoderm
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Skeleton, muscles, heart, blood
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Ectoderm
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Brain, nervous system, epidermis of skin, lens of eye, mammary glands
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Guinea Worm
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-1 meter long-a few decades ago in 25 million in India-could be eradicated--but war torn countries fall behind on control
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Phylum Annelida
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-earthworms, polychaetes, leeches-segmented bodies-earthworms are our friends -leeches are good too
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Phylum Mollusca
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-gastropods, bivalves, cephalopods -snails, clams, octopi
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