http://www.youtube.com/watch?v=zcZXG4KGri8

The Unsegmented Worms

TEKS 8C Identify the characteristics of the animal kingdom 10A Interpret the functions of the body systems 11B Identify how organisms respond to stimuli

Characteristics of Worms Bilateral symmetry Cephalization Have organs Parasitic or free-living

Phylum Platyhelminthes: Flatworms Have no coelom No respiratory or circulatory systems

Phylum Platyhelminthes: Flatworms Reproduce sexually or asexually

Phylum Platyhelminthes: Flatworms Class Turbellaria Ex. Planaria Free-living Two eyespots Lateral lobe

Phylum Platyhelminthes: Flatworms Class Turbellaria Ganglia Mouth, no anus Pharynx Intestine Flame cells

Phylum Platyhelminthes: Flatworms Class Turbellaria Reproduction Asexual regeneration Sexual hermaphrodites

Phylum Platyhelminthes: Flatworms Class Trematoda Ex. Flukes Internal parasites Cuticle 2 suckers Incomplete digestive system

Phylum Platyhelminthes: Flatworms Class Cestoda Ex. Tapeworms Internal parasites Proglottids

Phylum Platyhelminthes: Flatworms Class Cestoda Scolex No mouth or digestive system

Phylum Platyhelminthes: Flatworms Class Cestoda Reproduction hermaphrodites

Tapeworms in the intestines

Phylum Nematoda: Round Worms Pseudocoelem Free-living or parasitic Ganglia Have mouth and anus Digestive system Not hermaphrodites

Pinworms Endoscopy of colon

Trichinella

Hookworms under the skin

Parasitic Eye Worms

Dracunculus

Heart Worms

Elephantiasis – caused by filarial worms that blocks lymph vessels in body