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Chapter 30 - Chapter30 31 AnimalDiversity TrueCoelomates...

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Chapter 30+31 Animal Diversity True Coelomates Pseudocoeloms Acoelomates Circulatory System -Absent – all diffusion -Closed Circulatory System- all circulation  trhough blood vessels (most effiecient) -Open circulatory system-includes blood  cavities (blood sinuses or hemocoels) that  bathe the tissues Types of digestive systems -incomplete digestive system- only one  opening (two-way) gastrovascular cavity
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-complete digestive system –two openings  (one-way) Development of Digestive System -blastocoel -archenteron -blastopore Fate of Blastopore in a complete digestive  system -protostomes - blastopore develops into  mouth -deuterostomes - blastopore develops into  anus Phylum Platyhelminthes – flatworms -no coelom -incomplete digestive system
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-Class Turbellaria – planarians -Class Cestoda – tapeworms (parasites) -Class Trematoda – flukes (e.g.  schistosomes) (parasites) Phylum Nematoda -“round worms”
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  • Spring '08
  • Martin
  • Annelid, digestive system Phylum, Pseudocoeloms Acoelomates Circulatory, circulatory system­includes blood, anus Phylum Platyhelminthes, leeches Phylum Arthropoda

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