Amphioxus
Pronunciation: am′fē-ok′sŭs
Definition: A genus of small, translucent, fishlike chordates found in warm marine waters. Members are structurally similar to vertebrates in having a notochord, gills, digestive tract, and nerve cord, but they lack paired fins, vertebrae, ribs, or a skull Branchiostoma lanceolatum.
[amphi- + G. oxys, sharp]
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Examples: glitazone, GI cocktail, etc.

