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12 Cards in this Set
- Front
- Back
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what are platyhelminthes? |
flat worms |
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what does platyhelminthes include? |
tape worms,flukes, and planarians |
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body structure |
-bilateral symmetry (body can be evenly divided lengthwise) ~cephalic ~nervous system ~acelomate |
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what does cephalic mean? |
they have a distinct head |
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how is their nervous system? |
-varies greatly -usually very primitive in parasites |
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what is the acelomate? |
-3 layers of cell tissue: ~endoderm ~ectoderm ~mesoderm -no actual body cavity |
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reproduction |
sexual or asexual |
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asexual reproduction in tape worms |
hermaphroditic using proglottids |
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asexual reproduction in planarians |
regeneration |
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nutrition |
varies greatly |
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planarian nutrition |
extend pharynx through a mouth, food digested outside the body, digested food sucked back into the body through the pharynx, and into the digestive tract. then, cells receive food by endocytosis. |
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tapeworm and fluke (other parasistic species) nutrition |
absorb nutrients directly from host |
