DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Beef liver fluke. Light micrograph of the reproductive region of a beef liver fluke (Fasciola hepatica). This endoparasite lives in two hosts; the primary host (when a fluke) is cattle and the secondary host (when larvae) is a snail (Limnaea truncatula). Magnification: x5 when printed at 10 centimetres wide.
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