Parasit intro

Question 1

Helminth phylums

Answer 1

1. Platyhelminthes
   - Trematodes: flukes
   - Cestodes: tapeworms
2. Nematoda: roundworms
3. Acanthocephala: thorny-headed worms

Question 2

Trematodes

Answer 2

Flukes

1. Endoparasites
2. Indirect lifestyle
3. Operculated, dense eggs

Question 3

Shistosomes

Answer 3

Type of fluke

1. Tubular body and dioecious with gynocophoric canal
2. Many spec pathogenic to humans
3. Eggs often have lateral spine

Question 4

Life cycle of flukes

Answer 4

1. In Snail
   - Miracidium to
   - Sporocyst to
   - Redia to
2. In water
   - Cercaria to
   - Metacercaria
   * after cercaria can
3. penetrate/ingested by 2nd IH
4. attach to vegetation and encyst
5. penetrate DH directly

Question 5

Two types Cestodes

Answer 5

Tapeworms

1. Pseudophyllidea
2. Cyclophyllidea

Question 6

About cestodes (4)

Answer 6

1. Hermaphroditic
2. Endoparasites
3. Absorb nutrients through body wall
4. Size varies

Question 7

Cyclophyllidean cestodes rostellum

Answer 7

armed or unarmed

Question 8

All cyclophylidium eggs have

Answer 8

6 hook hexacanth embryos

Question 9

In cyclophyllideans # scolices =

Answer 9

larvae

Question 10

Cysticercus
Cysticercoid
Coenurus
Hydatic cyst

Answer 10

Cysticercus-single scolex
Cysticercoid-single scolex
Coenurus-many scolices
Hydatid cyst-tons of scolices

Question 11

Nematodes

Answer 11

Roundworms

1. Tubular bodies with complete digestive system
2. dioecious
3. Life cycle: egg/larva, L1-L5 are larval stages (L3 usually infective)

Question 12

Nematode larvae

Answer 12

1. Oviparous - trichostrongyle eggs
2. Ovoviparous - L1 inside egg strongyloides egg
3. Larviparous - onchocerca microfilariae

Question 13

Nematodes: Rhabditoidea

Answer 13

strongyloides spp

Question 14

Nematodes: Trichostrongyloidea (5)

Answer 14

trichostrongylus
Ostertagia
Haemonchus
Cooperia
Dictyocaulus

Question 15

Nematodes: Metastrongyloidea (2)

Answer 15

metastrongylus

Meullerius capillarius

Question 16

Nematodes: Strongyloidea (3)

Answer 16

Strongylus
Cyathostomes
Oesophagostomum

Question 17

Nematodes: oxyuroidea

Answer 17

Oxyuris equi

Question 18

Nematodes: Ascaroidea

Answer 18

Ascaris
Parascaris
Toxocara

Question 19

Nematodes: Piruroidea

Answer 19

Thelazia

Draschia

Question 20

Nematodes: Trichuroidea

Answer 20

Trichinella
Trichuris
Capillaria

Question 21

Nematodes: Filarioidea

Answer 21

Onchocerca

Question 22

Acanthocephalans

Answer 22

Thorny headed worms

1. Fecal sed - layered eggs
2. Indirect lifecycle
3. Fluid filled body
4. Dioecious, lack dig tract
5. adults in SI vertebrates