amphioxus

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amphioxus:

see lanceletlancelet,
name for small, fishlike lower chordate (see Chordata), also called amphioxus; it shows many affinities with the vertebrates. There are about 30 lancelet species, most belonging to the genus Brachiostoma (formerly Amphioxus).
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amphioxus

[‚am·fē′äk·səs]
(zoology)
Former designation for the lancelet, Branchiostoma.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.