PAUL WHITTEN / SCIENCE PHOTO LIBRARY PAUL WHITTEN / SCIENCE PHOTO LIBRARY
Marine Lancelet (Brachiostoma (formerly Amphioxus)). To the left of it is the velum and a portion of the gills and to its right is the inner most portion of the vestibule. The lancelet is a small, translucent, fish-like lower chordate that shows many affinities with the vertebrates. It is thought that vertebrates evolved from ancestors similar to lancelets.
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