Flatworm of the genus Dugesia.
Ed Hendrycks © Canadian Museum of Nature / Musée canadien de la nature

 A flatworm of the genus Dugesia. Its pharynx is extended out its body to catch prey. Two eyes on the animal's head are visible in the upper left corner of the photo.

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This image is from a page of the Nature of the Rideau River Web site, created by the Canadian Museum of Nature. Visit the page.