lancelet

[lans-lit, lahns-]
noun
any of several small, lancet-shaped burrowing marine animals of the subphylum Cephalochordata, having a notochord and bearing structural similarities to both vertebrates and invertebrates.
Also called amphioxus.


Origin:
1565–75; lance2 + -let

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World English Dictionary
lancelet (ˈlɑːnslɪt)
 
n
Also called: amphioxus any of several marine animals of the genus Branchiostoma (formerly Amphioxus), esp B. lanceolatus, that are closely related to the vertebrates: subphylum Cephalochordata (cephalochordates)
 
[C19: referring to the slender shape]

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American Heritage
Science Dictionary
lancelet   (lāns'lĭt)  Pronunciation Key 
Any of various small, transparent, fishlike marine organisms of the subphylum Cephalochordata that are related to vertebrates but have a notochord instead of a true backbone. Unlike other primitive chordates, lancelets have a body divided into serially repeated muscular segments. Also called amphioxus.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

lancelet

any member of the subphylum Cephalochordata of the phylum Chordata. Small, fishlike marine invertebrates, they probably are the closest living relatives of the vertebrates. There are about 20 species in two families, each with a single genus. Branchiostoma was formerly called Amphioxus, a name that is retained as an informal term. The other genus is Epigonichthys, also called Asymmetron. The genus Asymmetron is sometimes retained for some species

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Leaves are lancelet shaped with prominent white veins and smooth or finely serrated edges.
In adult plants, leaves are lancelet shaped with prominent white veins and smooth or finely serrated edges.
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