Science Quiz / Invertebrates

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Parazoa
Sponges: sessile, no tissues, filter feeders.  
Radiata
Jellyfish, sea anemone, coral, hydra: central cavity, two distinct forms, no cephalization 
Acoelomate
Flatworms: parasites lack digestive cavity, planarians have one 
Pseudocoelomate
Rotifers: Digestive tract, pseudocoelom, filter feeders, some use parthenogenesis 
Roundworms: Digestive tract, sexual reproduction, free-living or parasitic 
Protosome
Chitons, gastropods (snails, slugs), cephalopods (octopi and squid), Bivalvia (clams, oysters) 
Segmented worms: Earthworms, sandworms, leeches 
Insects, arachnids, crustaceans, chilopods (centipede), diplopods (millipede): shed to grow, complex nervous and digestive systems 
Deuterosome
Starfish, sea urchins, sea cucumbers: bilateral larva, radial adults 
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Created Feb 19, 2012ReportNominate
Tags:Invertebrate, Phylum

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