Sea squirt

Sea squirt

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Credit: ALEXIS ROSENFELD/SCIENCE PHOTO LIBRARY

Caption: Sea squirt (Didemnum molle) on a rock. This sea squirt (class Ascidiacea) is a tunicate animal that filters plankton from the water that circulates through its siphons (small holes). It is part of the phylum Chordata and therefore has a notochord (primitive spinal cord) during its 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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Keywords: ancient, animal, ascidian, biological, biology, didemnum molle, fauna, filter-feeder, immobile, marine, nature, ocean, primitive, rock, sea, sea squirt, sessile, tunicate, underwater, urochordata, wildlife, zoological, zoology

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