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Amphioxus lanceolatus

Amphioxus \Am`phi*ox"us\, n. [NL., fr. Gr. ? + ? sharp.] (Zo["o]l.) A fishlike creature ( Amphioxus lanceolatus), two or three inches long, found in temperature seas; -- also called the lancelet. Its body is pointed at both ends. It is the lowest and most generalized of the vertebrates, having neither brain, skull, vertebr[ae], nor red blood. It forms the type of the group Acrania, Leptocardia, etc.

Amphioxus lanceolatus

Lancelet \Lance"let\, n. [Lance + -let.] (Zo["o]l.) A small fishlike animal ( Amphioxus lanceolatus), remarkable for the rudimentary condition of its organs. It is the type of the class Leptocardia. See Amphioxus, Leptocardia.