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21 Cards in this Set
- Front
- Back
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3 true body layers
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-ectoderm
-mesoderm -endoderm |
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Phylum Platyhelminthes
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flatworms
-3 true body layers |
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Class Turbellaria (phylum platyhelminthes)
ex 1-2. characteristics of living 3-6. unique characteristics |
ex. planarian
1. free-living 2. under rocks in fresh water 3. eye spots 4. pharynx 5. cephalization 6. 2 longitudinal nerves on the ventral surface that are connected by transverse nerves |
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pharynx
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tube on the ventral surface
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cephalization
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concentration of stimuli receivers (nerves) at the anterior end of an organism
-basically a head |
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Class Trematoda (Phylum Platyhelminthes)
ex 1. living 2-3. body characteristics 4. causes... 5. hosts |
ex. flukes
1. parasites to animals 2. have uterus 3. have genital pore 4. can cause blood clots, remove blood nutrients, can cause kidney stones 5. snails are intermediate host; humans are accidental hosts |
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uterus
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used for developing young
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genital pore
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used for fertilization
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Class Cestoda (Phylum Platyhelminthes)
ex 1-2. general characteristics 3. digestion 4-6. body characteristics |
ex. tape worms
1. most common parasitic worms 2. 200,000 eggs per day 3. no digestive system; absorbs nutrients from host 4. scolex 5. proglottids 6. cuticle |
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scolex
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knob-shaped head
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proglottids
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body sections
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cuticle
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thick, protective covering that keeps the worm from being digested by its host
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segments
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specialized; each one has different job
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sections
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not specialized; each one is identicle
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Phylum Rhynchocoela
ex. 1-3. general characteristics 4-6. body systems and traits |
ex. ribbon worms
1. free-living 2. longest growing worms (pretty) 3. marine 4. primitive circulatory system 5. proboscis 6. first group to have one way digestive tract |
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proboscis
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muscular tube used to capture prey
-like pharynx |
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Phylum Nematoda
ex 1. general characteristic 2. geography 3-6. body arrangement & characteristics 7. parasitic? |
ex. roundworms
1. long, slender worms that are tapered at both ends 2. live in water and sandy soil (south) 3. bilaterally symmetric 4. "tube-within-a-tube" arrangement 5. inner tube is digestive tract; outer tube body 6. anus 7. some are parasites |
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trichinella
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parasites in Phylum Nematoda
-in pork |
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Ascaris
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parasites in Phylum Nematoda
-in areas of poor sewage treatment and poor hygiene |
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guinea worm
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-parasites in Phylum Nematoda
aka "Holy Land cyclops"- Dracunuculus |
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pinworms,whipworms, hookworms
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parasites in phylum nematoda
-get from barefeet -in our back yard |
