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Untitled
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- 1PHYLUM CNIDARIA Sea Anemones, Jellyfish, Corals, FRESHWATER HYDRASTRUCTURE
dipoloblastic
digestive cavity - enteron = sac like
mouth - also serves as anus
radially symmetrical
Tentacles - stinging cells: CNIDOCYSTS
often sedentary - undertake cartwheel movements - 2PHYLUM PLATHELMINTHES PLANARIANS FLATWORMSSTRUCTURE
triploblastic
no coelom - acoelomate
dorsoventrally flattened - LARGE SA - VOL RATIO
gut cavity - single opening and branched
bilaterally symmetrical
body supported by aqeuous medium and mesoderm
gliding movement due to : action of cilia on layer of mucus produced by slime cells - 3PHYLUM ANNELIDA SEGMENTED WORMS - EARTHWORMSTRUCTURE
triploblastic
coelomate - body cavity formed in mesoderm
coelom - large and fluid filled -> serving as a hydrostativ skeleton for provding room for development of organs
through one way gut: mouth and anus
body = bilaterally symmetrical
metamerically segmented
locomotion: relies on action of muscles acting on hydrostatic skeleton aided by external bristles of chitin
ease of movement: earthworms = long and thin
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