Echinochasmus schwartzi is a fluke that infects dogs (Canis lupus familiaris), muskrats (Ondatra zibethicus), and marsh rice rats (Oryzomys palustris).

[1] It uses Fundulus fish as its intermediate host.

[2] Adults are similar to Echinochasmus microcaudatus, but differ in features of the oral sucker.

[3]