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4 Cards in this Set
- Front
- Back
Macracanthorhynchus hirudinaceus
picture for id: adult in tissue cross section |
pictured: cross section
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Acanthocephala description
how many body divisions? brain? special appendage? |
3 body divisions: anterior, presoma, and posterior region called the trunk
Presoma = proboscis and neck. proboscis receptacle attached to neck Has proboscis, retractable, armed with hooks, becomes embedded in intestine of final host brain is "cephalic ganglion" in presoma no digestive system dioescious |
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Acanthocephala male features
# testes? special adaptation? |
May have cement gland
copulatory bursa with cirrus at posterior end of trunk two testes |
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Acanthocephala life cycle
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eggs embryonated when laid, have 3-4 enveloping membranes. eggs released by fish into water, eggs adhere to plant
crustacean or insect ingests, egg hatches Acanthor (fusiform larva) penetrates gut and enters body cavity develops into acanthella. encystment -> cystacanth Fish eaten by bird or mammal |
