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21 Cards in this Set

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3 true body layers
-ectoderm
-mesoderm
-endoderm
Phylum Platyhelminthes
flatworms
-3 true body layers
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
pharynx
tube on the ventral surface
cephalization
concentration of stimuli receivers (nerves) at the anterior end of an organism
-basically a head
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
uterus
used for developing young
genital pore
used for fertilization
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
scolex
knob-shaped head
proglottids
body sections
cuticle
thick, protective covering that keeps the worm from being digested by its host
segments
specialized; each one has different job
sections
not specialized; each one is identicle
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
proboscis
muscular tube used to capture prey
-like pharynx
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
trichinella
parasites in Phylum Nematoda
-in pork
Ascaris
parasites in Phylum Nematoda
-in areas of poor sewage treatment and poor hygiene
guinea worm
-parasites in Phylum Nematoda
aka "Holy Land cyclops"- Dracunuculus
pinworms,whipworms, hookworms
parasites in phylum nematoda
-get from barefeet
-in our back yard