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Platyhelminthes

BIOL2204 Platyhelminthes and Nemertea

QuestionAnswer
Symmetry P bilateral symmetry
Flat or round? :P dorsoventrally flattened (also called flatworms)
Digestive system P highly branched gastrovascular cavity, acoelomates (no body cavity), blind gut, protrusible pharynx
Why so flat? P Higher SA:V, oxygen and CO2 diffuse easily and nutrients diffuse from the branched gastrovascular cavity into tissues
Nemertea features also called ribbon worms, unsegmented, bilateral symmetry, complete digestive tract
Proboscis eversible, housed in rhynchocoal (coelemic fluid-filled cavity) separate from digestive cavity
Created by: mishm
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