Platyhelminthes Flashcards
Blood fluke
Schistosoma
Lung fluke
Paragonimus westermani
Bladder fluke
Polystoma
Dwarf tapeworm
Hymenolopsis nana
Dog tapeworm
Echinococcus granulosus / Hydatid worm
Fish tapeworm
Diphyllobothrium
Excretory organs in platyhelminthes
Flame cells/ protonephridia/ solenocytes
Diplozoon
- Ectoparasite on fish
- Complete monogamy
Rod like bodies in turbellarians
Rhabdites
Alternation of host and alternation of generations
Fasciola
Light sensitive cells in planaria
Ocelli
Regenerative cells in platyhelminthes
Neoblasts/ formative cells
Everted pharynx found in
Planaria (extra-oral digestion)
Fascioliasis caused by
Fasciola hepatica
Fasciolopsis caused by
Fasciola buski
Mehli’s gland
Lubricates egg passage
Vitelline gland
Produces yolk
Laurer’s canal
Acts as vagina
Intermediate host of fasciola
Snail (Planorbis, Lymnae)
Larval stages of Fasciola
Egg → Miracidium → Sporocyst → Redia → Cercaria → Metacercaria
(मिस रेश्मी)
Larva infective to snail
Miracidium
Larva infective to sheep
Metacercaria
Pedogenetic parthenogenesis
Redia (produces same generation of daughter redia larva)
Schistosoma haematobium
In human pelvic veins
Schistosoma mansoni
In ileocecal junction
Schistosoma japonicum
Hepatic portal and mesenteric veins
Schistosoma illnesses
Bladder injuries, bladder stones, haematuria
Secondary host of schistosoma
Snail (Bulinus)
Larval stages of schistosoma
Egg → Miracidium → Sporocyst → Cercaria
Schistosoma larva infective to snail
Miracidium
Schistosoma larva infective to man
Cercaria
Growth zone/ Zone of proliferation in Taenia
Neck
Main part of taenia below neck
Strobilla (segments called proglottid)
Types of proglottids
- Immature proglottids
Reproductive organs immature or absent. - Mature proglottids
Contains many testes and a pair of ovaries. - Gravid/ ripe proglottids
Contain fertilized eggs, detached by apolysis.
Wallowers of intestine
Taenia
Male copulatory oragan in Taenia
Cirrus
Hosts of taenia solium
Primary : Man
Secondary : Pig
Larval stages of Taenia
Egg → Oncosphere → Hexacanth → Cysticercus → Adult
Stage of taenia infective to man
Cysticercus (causing cysticercosis)
Stage of taenia infective to pig
Oncosphere and Hexacanth
Taenia infection in brain
Neurocysticercosis
Pork tapeworm
Taenia solium
Beef tapeworm
Taenia saginata
Smallest tapeworm
Echinococcus granulosus
Longest tapeworm
Diphyllobothrium latum
Most injurious parasite in intestine of man
Diphyllobothrium latum
Smallest human tapeworm
Hymenolopsis nana
Secondary host of lung fluke
Amphibious snail and crayfish