kingdom Metazoa Phylum Platyhelminthes Phylum Aschehelminthes Phylum Annelida Phylum Platyhelminthes Class a Trematoda b Cestoidea ID: 1047761
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1. HelminthologyPart 1Lab 7
2. kingdom :- MetazoaPhylum :- PlatyhelminthesPhylum :- AschehelminthesPhylum :- Annelida Phylum :- PlatyhelminthesClass: - a- Trematoda b- Cestoidea
3. a- Class: - TrematodaGeneral characteristics :-Flattened dorso-ventrally worms ( schistosomes are exception )Attach to their host by means of suckers(oral and ventral suckers )No body cavity.Need to two hosts to complete the life cycle (intermediate host in snail and the final host in the man).Hermaphroditic (schistosomes are exception).
4. Classified into 4 groups according to their sites of living :- *Liver flukes *Intestinal flukes *Lung flukes *Blood flukes
5. Liver flukesEx: - Fasciola hepaticaCommon name: - The sheep liver flukes.Disease :- FascioliasisHabitat: - Adult worm lives in the biliary tract of herbivores (sheep, goat and cattle) and man for about 5 – 10 years.Intermediated host: - Snail from genus Lymnaea.
6. Fasciola hepatica adult fasciola hepatica ovum
7. General characteristics:-Adult worm is large, flattened dorso-ventrally.It has conical projection interiorly and rounded posteriorly.It has 2 suckers' ventral and oral suckers.Digestive system consists of: - mouth pharynx esophagus branched intestine (two intestinal caeci) with many lateral branches.
8. The male reproductive system consists of two greatly branched testes one behind the other in posterior half of the worm.The female reproductive system consists of a fan shapedovary oviduct ootype uterus genital pore.The egg is large oval, operculated, brownish yellow in color.Infective stage is the metacercaria stage.Laboratory diagnosis :-Ova are found in feaces (microscopic examination of stool specimens).
9. Fasciola hepatica adult structure
10. Life cycle of Fasciola hepatica