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8 Cards in this Set

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  • Back
Describe the anatomy of planaria.
-Eyespots to detect light-ocelli
-can regenerate
-flame cells for excretion
-ganglia (nervous net)
-pharynx
-digestive system
Why are ribbonworms described as a transitional group between flatworms and roundworms?
flatworms -> no body cavity
Ribbonworms ->false body cavity (acoelomate)Roundworms -> pseudocoelmate (body cavity)
What are the similarities between flatworms and roundworms?
flatworms have no body cavity, one way gut and are hermaphrodites.
Roundworms have body cavity complete gut, seperate sexes.
All animals other than sponges. Have tissue and symmetry.
eumatazoans
Develop a definite head region where nervous tissue is bunched up.
cephalization
False body cavity
Acoelomate
lined both on inside of body wall & around the gut by mesderm
Coelomate
body cavity located between endoderm and mesoderm
pseudocoelom