MICHEL DELARUE, ISM / SCIENCE PHOTO LIBRARY MICHEL DELARUE, ISM / SCIENCE PHOTO LIBRARY
Sea urchin larva, light micrograph. This larval stage is known as a pluteus. Although a mature sea urchin has five-fold radial symmetry (pentamerism), the pluteus stage has bilateral symmetry, with the plane of symmetry passing down centre in this view. This is a phase contrast image.
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