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.
CLASS 2: TREMATODA
All parasitic Mainly in digestive tract Most with suckers Most with 2-more host life cycles Body covered with tegument. Body not segmented.
Class: Trematoda
Subclass: Digenea All are endoparasitic Life cycle contain 2 hosts ( intermediate and final
host)
FASCIOLA (Liver fluke)
Binomial name
Fasciola hepatica
Schistosoma sp. (Blood fluke)
Worm pairs can live for more than 10 years in a
hostPair migrate back
against the blood flow to the mesenteries
around the intestine.
Segmented worms.
- body is divided into : scolex; neck; proglottides {immature, mature and gravid}
- No digestive system.
Class: Cestoda
StrobilaStrobilation:
Asexual process of forming segments
New proglottids are continuously formed in the neck just below the scolex
Subclass: Eucestoda(TrueTapeworms)
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.
PHYLUM NEMATODA 1- Cylindrical worms 2- Body covered with cuticle 3- Tribloblastica 4- Pseudocoelomate 5- Sexes are separate 6- Complete digestive system
*Class 1: Secernentea
Order: Ascarida
Family: Ascarididae
3 lips around mouth
2 copulatory spicules in the end of male
EX: Ascaris sp
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.