flatworms or who got run over by the mail truck. i. general traits or characteristics a. simplest...
Post on 21-Dec-2015
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Flatwormsor
Who Got Run Over by the Mail Truck
I. General Traits or Characteristics
• A. Simplest animal that possesses bilateral symmetry
B. Bilateral symmetry
• 1. recall that organism has a dorsal and ventral surface
• 2. also has a left and right side
C. Cephalization
• 1. concentration of nerve tissue in the head of the animal
• 2. two ventral nerve cords running posteriorly
• 3. anterior sensory organs
D. TriploblasticE. No coelom
F. Possesses organ systems
• 1. digestive system– a. Single opening– b. Tubular
muscular pharynx– c. Single arm
leading anteriorly– d. Forked branch
leading posteriorly– e. Note highly
branched nature
Muscular pharynx
Flatworm feeding
• http://www.martinmicroscope.com/HDVideoDownloads.htm
• http://www.youtube.com/watch?v=Fq_aSR5FK0Y&NR=1&feature=fvwp
2. Reproductive system
• a. Hermaphroditic• b. Both sexes on
same organism
3. Excretory system
4. No respiratory nor circulatory system
• Why not?
II. Classes of platyhelminthes
• A. Turbellaria• 1. already described• 2. planaria and relatives
B. Monogenea
• 1. parasitic forms• 2. ectoparasites
C. Trematodes-schistosomiasis
D. Cestoidea-tapeworm
• 1. scolex• 2. proglottids• 3. de-evolution• 4. reproductive machine• 5. pieces of “rice” in
feces
This is HUGE!!!
Once you are attached…
That is what you call “knockers”
Aren’t parasites fun?
What does this say??