ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Ascidians (family Didemnidae) on a rock. These are tunicate animals that filter plankton from the water. In the early stages of their development they have a notochord, a primitive spinal cord. This makes them distant relatives of all vertebrates. Photographed off Andros Island in the Bahamas, in the Caribbean Sea.
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