invertebrates 1 copyright cmassengale. characteristics 2
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InvertebrateInvertebratess
1copyright cmassengale
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Invertebrate Phyla• Sponges• Cnidarians• Platyhelminthes• Nematodes• Mollusks• Annelids• Echinoderms• Arthropods
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Sponges (Porifera)• Most primitive• Cells relatively
independent• Mostly marine• No Symmetry
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Cnidarians• Mostly marine• Radial Symmetry
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Cnidarians• Jellyfish• Hydra• Coral
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•Sea anemone
•Portuguese Man-O-War
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Platyhelminthes• Flatworms• Bilateral
symmetry• Cephalization
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Planarian – freshwater flatworm
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Nematodes• Tube-like
digestive tract• Roundworms!• Mouth and anus• No segmentation
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Mollusks• Clams, snails,
squids• Varied habitats
– Marine– Freshwater– Terrestrial
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Annelids• Segmented
worms• Common
earthworm• Leech
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Arthropods• Joint-legged
animals• External skeleton• Huge variation –
mostly insects
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Echinoderms• Always marine• Starfishes, sea
urchins, sea lilies• Spiny skin
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Brittle Star – An Echinoderm
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