Helminths: Trematodes

Question 1

Schistosoma mansoni

Answer 1

Ovum/egg: 112-182um long
egg contains developed miracidium
large lateral spine

Question 2

Schistosoma japonicum

Answer 2

Ovum/egg:50-85um long
egg contains developed miracidium
small lateral spine

Question 3

Schistosoma haematobium

Answer 3

Ovum/egg: 110-170um long
egg contains developed miracidium
large, terminal spine

Question 4

Fasciola/Fasciolopsis species

Answer 4

Ovum/egg: 128-140 long
oblong shape
egg contains undeveloped miracidium
operculum present.
generally indistinguishable

Question 5

Clonorchis sinensis

Answer 5

Ovum/egg: 30um long
somewhat oblong, (mouse one)
egg contains developed miracidium
operculum: present with shoulders
small knob opposite operculum

Question 6

Paragonimus westermani

Answer 6

ovum: 78-120um
somewhat oval shape
contains undeveloped miracidium
operculum is present with shoulders
terminal shell thickening