STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Sponge spicule. Coloured scanning electron micrograph (SEM) of a spicule from the deep sea sponge Geodia nodastrella. Sponges are primitive aquatic organisms that filter food from the water. They are a loose aggregation of cells supported by spicules and needles composed of silica.
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