Clonorchis sinensis

Clonorchis sinensis egg
Trichrome stain x1000

This is an egg of the liver fluke Clonorchis sinensis in a trichrome stained preparation. The prominent operculum that produces the shoulders characteristic of eggs of this species is evident.

The knob at the abopercular end is also present. At times this might not be evident.

Clonorchis sinensis egg
Trichrome stain x1000

Ova are best detected in wet-mount preparations, but are frequently seen in the permanent stain.

Clonorchis sinensis egg
Phase contrast x 400

Note the prominent operculum that produces the "shoulders" characteristic of eggs of this species and the small "knob" at the abopercular end.