J. C. REVY, ISM / SCIENCE PHOTO LIBRARY J. C. REVY, ISM / SCIENCE PHOTO LIBRARY
Tunicate larva. Light micrograph of a tunicate (or sea squirt) larva (family Salpidae). This is a small marine invertebrate whose larval stage has a primitive backbone (notochord, red) and a tail (red). The larva is free-swimming (pelagic). The body consists of a sack with siphons to pass water through for filter-feeding and movement. The adult form of some tunicates attaches to a substrate and loses its nervous system. This salp though, with a barrel-shaped body, is completely pelagic and is common in the open ocean. Magnification unknown.
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