SBI 3U Wormlike Animals.

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Presentation transcript:

SBI 3U Wormlike Animals

We are going to study… Platyhelminthes (flatworms) Nematodes (roundworms) Annelids (segmented worms)

Phylum Platyhelminthes Flatworms Acoelomates Bilateral symmetry Cephalization True organs Free-living and parasitic

Platyhelminthes – Free Living Flatworms Small “Blind” digestive system Nervous tissue Hermaphroditic Ex: Planaria

Platyhelminthes – Parasitic Flatworms Dependent upon host Little sensory reception Digestive system absent in some Highly developed reproductive system Example: Flukes and Tapeworms

Phylum Nematoda Roundworms Pseudocoelomates Complete digestive tract Simple nervous system No respiratory or circulatory system Free-living & Parasitic

Phylum Nematoda: Parasitic Roundworms Attack plants & animals Some help humans Ex: Ascaris

Phylum Annelida Segmented worms Coelomates Ex: Earthworms

Earthworms and Ecology Agriculture