Second course

GENERAL CHARATRISTICS  Helminths are elongated flat or round worm like parasites measuring few milimeters to meters.  They are eukaryotic multicellular and bilaterally symmetrical   

 Phylum Platyhelminths (flat worms)— it includes three classes: Class: Cestoidea (tapeworms)  Class: Trematodea (flukes or digeneans)  Class: Monogenea (ectoparasite of fishes, don’t infect man)    

2.Phylum: Nemathelminths.  The classification of all the medically important helminths according to their habitat in man .  

 FLATWORM PHYLUM : PLATYHELMINTHES GROUP 2. • Phylum Platyhelminthes includes the flatworms. Platy means “flat,” like a plate; helminth “worm”. 3. Characteristics feature • Invertebrate organism • Flatworm have soft and unsegmented body • No body cavity (no specialized respiratory and circulatory system) also called acoelomate • Other species have digestive system (incomplete or absent) • Most flatworm have gastro-vascular cavity.