1- Dorsoventrally compresed 2-Tribloplastica 3-Aceolomate 4-Bilateral symmetry 5- Body have suckers (oral and ventral sucker) 6- alimantery canal if present incomplete Phylum Platyhelminthes

class 1: Turbellaria - free living in fresh,marine water,some times in soil or on plants. - 2 eye spots -eversible pharynx - digestive system (tri intestinal ceaca.) ex: Planaria sp.

 All parasitic  Mainly in digestive tract  Most with suckers  Most with 2-more host life cycles  Body covered with tegument.  Body not segmented.

Subclass : Digenea  All are endoparasitic  Life cycle contain 2 hosts ( intermediate and final host)

Binomial name Fasciola hepatica

 Adults inhabit the bile ducts of sheep, goat, cattle and buffaloes

Schistosoma sp. (Blood fluke) Worm pairs can live for more than 10 years in a host Pair migrate back against the blood flow to the mesenteries around the intestine.

Strobilation: Asexual process of forming segments New proglottids are continuously formed in the neck just below the scolex

Adults live in the intestine of vertebrates The body of a true tapeworm is divided into three main regions: a Scolex bearing attachment organs, a short Neck and a Strobila formed of numerous proglottids Adults live in the intestine of vertebrates The body of a true tapeworm is divided into three main regions: a Scolex bearing attachment organs, a short Neck and a Strobila formed of numerous proglottids EX :Taenia saginata, Taenia solium, Scolex ("head") with four suckers.  Proglottids have genital openings on lateral side.

TAENIA SPP Taenia saginata

TAENIA SOLIUM

Gravid T.saginata

 1- Cylindrical worms  2- Body covered with cuticle  3- Tribloblastica  4- Pseudocoelomate  5- Sexes are separate  6- Complete digestive system

Phylum: Nematoda with special sense organs(amphids&phasmids) Class: Secernetea

*Class 1: Secernentea Order: Ascarida Family: Ascarididae 3 lips around mouth 2 copulatory spicules in the end of male EX: Ascaris sp

. Large intestinal nematodes, infects humans, some infects pigs,Female lays eggs into host intestine (200,000 per day), passed out in host feces.

Ascaris sp. oval with thick mammillated. shell. Undeveloped contain fertilized ovum