ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Sea squirts (Didemnum molle) on a rock. These sea squirts (class Ascidiacea) are tunicate animals that filter plankton from the water that circulates through their siphons (small holes). They are part of the phylum Chordata and therefore have a notochord (primitive spinal cord) during their early stages of development. Sea squirt larvae are free-swimming and resemble tadpoles, but as they mature they become more barrel-like in shape and are immobile (seen here).
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