Biology 546
Human parasitology laboratory tutorial

The adult trematode on the left was removed from the small intestine of a native Kansan at autopsy. It measured 1.5 centimeters in length and had a circumoral collar of spines numbering 37. What species does it most likely represent?

Clonorchis sinensis
Echinostoma trivolvis
Fasciola hepatica
Paragonimus westermanni

Original. Photograph by S.J. Upton. A good review on echinostomes is Huffman and Fried, 1990, Advances in Parasitology 29: 215-269.

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