flatworm

flatworm - (usually with hooks to attach to a host...

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Cnidarian Reproduction Asexually – budding (polyp form) Sexually –have separate male and female  medusae that produce gametes that join through  external fertilization to produce polyps.
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Flatworms - Platyhelminthes Bilateral Symmetry   Free-living in freshwater or parasitic in a host Has all three layers (endoderm, mesoderm,  ectoderm) Acoelomate – no body cavity.
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An Important Group  Many nasty parasitic infections. Dugesia Tapeworms Flukes
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Flatworm Feeding Free living flatworms are scavengers. Parasitic flatworms use specialized structures 
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Unformatted text preview: (usually with hooks) to attach to a host. Respiration & Excretion Excretion - Flame cells remove excess water Respiration - Oxygen diffuses into body cells directly. Flatworm Nervous Systems First appearance of cephalization . Primitive brain. Eyespots Flatworm Reproduction Sexually - Hermaphrodites – internal fertilzation. Asexually – fission – when damaged, regenerates new body parts. Proglottids – found in tapeworms – each is shed off individually....
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flatworm - (usually with hooks to attach to a host...

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