GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Lambert's worm sea cucumbers (Synaptula lamperti, white) on a giant barrel sponge (Xestospongia testudinaria). This small white sea cucumber lives in groups. It is always found in association with a host sponge. It feeds by sifting organic matter from the surface of the sponge. This appears to do the sponges no harm. Photographed in Komodo, Indonesia.
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