Parasit intro Flashcards
1
Q
Helminth phylums
A
- Platyhelminthes
- Trematodes: flukes
- Cestodes: tapeworms - Nematoda: roundworms
- Acanthocephala: thorny-headed worms
2
Q
Trematodes
A
Flukes
- Endoparasites
- Indirect lifestyle
- Operculated, dense eggs
3
Q
Shistosomes
A
Type of fluke
- Tubular body and dioecious with gynocophoric canal
- Many spec pathogenic to humans
- Eggs often have lateral spine
4
Q
Life cycle of flukes
A
- In Snail
- Miracidium to
- Sporocyst to
- Redia to - In water
- Cercaria to
- Metacercaria
* after cercaria can - penetrate/ingested by 2nd IH
- attach to vegetation and encyst
- penetrate DH directly
5
Q
Two types Cestodes
A
Tapeworms
- Pseudophyllidea
- Cyclophyllidea
6
Q
About cestodes (4)
A
- Hermaphroditic
- Endoparasites
- Absorb nutrients through body wall
- Size varies
7
Q
Cyclophyllidean cestodes rostellum
A
armed or unarmed
8
Q
All cyclophylidium eggs have
A
6 hook hexacanth embryos
9
Q
In cyclophyllideans # scolices =
A
larvae
10
Q
Cysticercus
Cysticercoid
Coenurus
Hydatic cyst
A
Cysticercus-single scolex
Cysticercoid-single scolex
Coenurus-many scolices
Hydatid cyst-tons of scolices
11
Q
Nematodes
A
Roundworms
- Tubular bodies with complete digestive system
- dioecious
- Life cycle: egg/larva, L1-L5 are larval stages (L3 usually infective)
12
Q
Nematode larvae
A
- Oviparous - trichostrongyle eggs
- Ovoviparous - L1 inside egg strongyloides egg
- Larviparous - onchocerca microfilariae
13
Q
Nematodes: Rhabditoidea
A
strongyloides spp
14
Q
Nematodes: Trichostrongyloidea (5)
A
trichostrongylus Ostertagia Haemonchus Cooperia Dictyocaulus
15
Q
Nematodes: Metastrongyloidea (2)
A
metastrongylus
Meullerius capillarius
