PATRICK LYNCH / SCIENCE PHOTO LIBRARY PATRICK LYNCH / SCIENCE PHOTO LIBRARY
Lancelet (Branchiostoma sp.). The lancelet (or Amphioxus) is a primitive relative of the fish. It lacks a true backbone, but does have a notochord, a supporting rod that is considered to be the evolutionary forerunner to a full backbone. It lives in sediment with its mouth (upper left) protruding, and it uses fine tentacles to waft food into its mouth. The lancelet can reach a length of up to two centimetres.
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