n. 文昌鱼

[ noun ]
small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates
<noun.animal>

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}.

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.