ZOO4232 - Lecture 6 General Features of Trematodes

ZOO4232 - Lecture 6 General Features of Trematodes -...

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9/19/2010 1 GENERAL CHARACTERISTICS OF THE TREMATODA The phylum Platyheminthes dorsoventrally flatten worms commonly known as Flatworms. Four classes make up the phylum and two are parasitic to humans and include: (1) Trematoda-flukes; and (2) Cestoida-type- worms. The third class is Mongenea (parasites to the skin and gills of fish skin and gills of fish. All members of this phylum have bilateral symmetry, a body cavity and when a digestive tract is present it is incomplete (mouth serves both for ingestion and egestion. The space between the body wall and organs is filled with connective tissue fibers muscle and both attached and unattached cells. The class Trematoda has two subclasses: (1) Aspido- gastrea; and (2) Digenea. The Digenea are the largest group of platyheminths that are parastitic.
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9/19/2010 2 DIGESTIVE TRACT Tegum ent Tegum ent Gastroderm is Gastroderm is