Theme 4: platyhelminthes

Ectoparasite

only body surface

Endoparasite

within tissue

Infection means

endoparasite

Intermediate host

vector, particular stage of its life cycle

Definitive host

where it can reproduce

Reservoir host

carrier for pathogen

Direct life cycle

single host required for development

Indirect life cycle

two or more species to complete

Trematoda are what sex

monoecious (hermaphrodites)

Trematoda have what excretory cells

protonephridia (flame cell)

Trematoda tegument biggest difference is

no cilia in adult

What is sometimes present in Trematoda

hooks and suckers

Digeneans are

where 6000 flukes are in

Aspidogastreans are

where fewer than 100 flukes are in

Digeneans require

at least one intermediate host

Schistosoma sp. Is

blood flukes

Schistosoma sp. Snails are …

intermediate hosts

Intermediate of digeneans is

snail (mollusc)

Name the digeanean life cycle a… e… m…s…r…c…m…

adult, egg , miracidium, sporocyst, redia, cercaria, metacercaria

Faciola sp. Intermediate host is

snails

Faciola sp. Definitive host is

humans, ruminants, non ruminants

Fasciola gigantica is mainly found in

tropical, subtropical

Fasciola hepticaa found where

sheep / cattle raised

Clonorchiasis intermediate hosts

snails then fish

Paragonimiasis 1st intermediate host

snail

Paragonimiasis 2nd intermediate host

crab/crayfish

What is the species for paragonimiasis

paragonimus sp.

Aspidocotylea intermediate host is

snail

Aspidocotylea definitive host

fish

Cestoda are

endoparasitic

What are the segments that cestoda divided into called

proglottids

Cestoda are sex wise

monoecious

The excretory system of cestoda contains

protonephridia

Teania sp.

cestoda

Echinococcosis sp. Intermediates

sheep, goat , cattle, rodents, humans

Echinococcosis sp. Definitive

foxes

Dipylidium sp.

flea tape worm