Biology 625
Supplemental visual material

Echinostoma trivolvis

anterior portion

circumoral collar of spines

SEM showing spines

Echinostomes possess one or two circumoral collar of spines. Depending upon the species, the number of spines may vary from 27 to 51. Echinostoma trivolvis in North America is one of about four 37-collar-spined species commonly used in research. The parasite is naturally found most often in muskrats and anseriforme birds. A good review is Huffman and Fried, 1990, Advances in Parasitology, 29: 215-269.


Originals; first two photographs by S.J. Upton. SEM from the J.E. Ackert teaching collection at Kansas State University and the original source is unknown.

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Kansas State University | Biology Division