Chapter 7 and 8 - Phylum Platyhelminthes, Class trematoda

Trematodes are

dorsoventrally flattened, unsegmented, and leaf like parasites

Monogentetic trematodes are seen in

aquatic fish, amphibians, and reptiles

Dignetic trematodes are seen in

domestic animals, wild animals, and occasionally human beings

adult fluke →

→ operculated egg

→operculated egg→

→miracidium→

→miracidium→

→sporocysts→

→sporocysts→

→ redia →

→ redia →

→cercaria→

→cercaria→

→metacercariae→

→metacercariae→

→adult fluke

cercaria will take one of ___ paths

3

flukes are found in the

digestive system

Dicrocoelium dendriticum host

sheep, goats, cattle

Dicrocoelium dendriticum zoonosis

zoonotic

Dicrocoelium dendriticum common name

lancet fluke

Dicrocoelium dendriticum location

bile ducts

Dicrocoelium dendriticum transmission route

ingestion of infected ants

very important fluke in terms of its economic effects on the hosts

fasciola hepatica

fasciola hepatica host

cattle, sheep, other ruminants

fasciola hepatica location

bile ducts

fasciola hepatica intermediate host

aquatic snail

fasciola hepatica transmission route

ingestion of aquatic vegitation with metecercariae

fasciola hepatica common name

liver fluke

fasciola hepatica zoonosis

zoonotic

Platynosomum fastosum hosts

cats

Platynosomum fastosum location

bile ducts

Platynosomum fastosum intermediate host

1st intermediate host - land snail

2nd intermediate host - lizard

Platynosomum fastosum transmission route

ingestion of infected lizard

Platynosomum fastosum common name

lizard-posioning fluke of cats

Platynosomum fastosum zoonosis

not zoonotic

nanophyetus salmincola host

dogs

nanophyetus salmincola location

small intestine

nanophyetus salmincola intermediate host

1st intermediate host - freshwater snail

2nd intermediate host - salmon

nanophyetus salmincola transmission route

ingestion of infection salmon

nanophyetus salmincola common name

salmon-poisoning fluke of dogs

nanophyetus salmincola zoonosis

zoonotic

alaria species host

dogs and cats

alaria species transmission route

ingestion of infected frog, snake, or mouse

alaria species zoonosis

not zoonotic

alaria species common name

intestinal flukes of dogs and cats

paragonimus kellicotti host

dogs and cats

paragonimus kellicotti location

lung parenchyma

paragonimus kellicotti common name

lung fluke of dogs and cats

paragonimus kellicotti intermediate host

1st intermediate host - operculated snail

2nd intermediate host - crayfish

paragonimus kellicotti zoonosis

zoonotic

a true tapeworm has 2-4

muscular suckers (acetibula)

what do acetibula do

attach tapeworm to muscular wall

most important tapeworm

diplidium caninum