Chapter 36 Biology
Terms
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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