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Zoo

Ch 8 Platyhelminthes/Nemertea

QuestionAnswer
Phylum Platyhelminthes/Nemertea: cavity, animal, symmetry acoelomates (solid worms), bilateral, flat and ribbon worms, dorsoventrally flattened
Phylum Platyhelminthes: animal, tissue segments, systems, reprod parasitic flatworm, triploblastic, unsegmented, incomplete digestive, flame cell, nervous systems. no circulatory or respiratory systems,parenchyma, most moneicious/hermaphroditic, totipotent(grow back parts)
Class Turbellaria: ex, envir., movement, digestive tract, 3 branch intestine Duggesia-freshwater Planaria;mostly freshwater; mouth on ventral end, 2/3 body w/ extendable pharynx; 1.goes forward 2. go back-has eye spot w.light/dark receptors 3. has chemoreceptors called auricles
Class Trematoda: animal; parasite type; body; movement; body makeup;reprod; host types int parasites in vertebrate animals;mostly reprod organs, massive # of offspring;no cilia-tough outer tegument; have attachment pnts. Oral and ventral (bigger) sucker, mouth w/ no anus; difinitive/intermediate; most monecious
tegument layer of protection when go thru rough envir
Class Trematoda ex: Clonorchis sinesis (human/liver fluke);Schistosoma mansoni (blood fluke-human)
intermediate;definitive host host in middle where flukes pass thru for maturation;final-they'll become sexually active and repro in
Class Cestoda: animal; parasite;envir;system;function tapeworms w/ribbon shaped body;inter parasite of vertebrate animal;adults live in smll intestine of vertebrate animal, colonial; no digestive; attach to walls of intestine w. scolex.the thinnest end is the attachment;proglottids
Class Cestoda ex: Taenia signota
Nematoda: type; size; envir; body parts;system ribbon;most 20cm long. up to 40'; marine predators;rhynchocoel'mouth/anus'1st grp animals w/ complete digestive/circulatory system (closed)
rhynchocoel envaginated tube containing a prolooseis used to papture prey. some armed. some charmed
Created by: Jamie D
 

 



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