FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Philodina rotifer. Light micrograph of a Philodina roseola rotifer's head, showing its mouthparts (left). Rotifers are microscopic aquatic animals that are related to roundworms. The hair-like cilia surrounding the rotifer's mouth are used to trap food particles such as alga (green circle).
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