Planarian-aquatic flatworm

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Presentation transcript:

Planarian-aquatic flatworm Anterior--toward the head Posterior—toward the back (rear end) Ventral—belly Dorsal—back, dorsal shark fin 1.) Planaria are often found under stones in fresh water ponds.

Planarian eating

A. 2 eyespots at the anterior are sensitive to light, but they can not see like we do. B. The pharynx is a tube on the ventral side of the planaria that sucks up food. C. Indigestible food comes back out the pharynx. D. Waste leaves through excretory pores on the surface of the worms body.

E. Planaria can reproduce by fragmentation-if they get cut in ½ the tail grows a head and the head grows a tail. Planaria also reproduce sexually, they are hermaphroditic--both male and female- so both give sperm and both get pregnant.