Chapter 37: Platyhelminthes and Nematoda

Phylum Platyhelminthes Class Turbellaria –3000 species, all(?) freeliving –E.g., planaria (Dugesia) Class Trematoda –All parasitic –E.g., flukes (Fasciola) Class Cestoda –All parasitic –E.g., tapeworms (Taenia)

Class: Turbellaria

Class: Trematoda (flukes)

Chinese Liver Fluke (Opisthorchis)

Schistosoma Male/female pair Schistosoma egg (highly magnified)

Schistosomiasis

An 8.8 m (28 ft) tape worm taken out of a human. They claim it was from eating sushi. Will you ever be able to eat sushi again?

Scolex A B

Mature/Gravid Proglottid A B C

Class: Cestoda (Tapeworms)

Phylum: Nematoda (roundworms) Highly numerous and diverse >1,000,000 species, many undescribed Diverse lifestyles (free living, parasitic Many are pathogenic to humans Have pseudocoelom Have complete digestive tract

Filarial worm

Elephantiasis

Loa loa, African Eye Worm

Ascaris

Warning!!!!!! Gross out alert! The next photo is quite graphic. View at your own risk!

Trichinella spiralis