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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use lancelet in a sentence
The development of the lancelet presents us with an instance of the two-layered larva, or Gastrula.
From the lowest of the Vertebrata, the lancelet, we passed on to the Lamprey, and from that to the true fishes.
The human heart may present in degenerates all types from the pulsating vessel found in the lancelet up to that of the mammal.Degeneracy | Eugene S. Talbot
Nothing of the nature of lung or air-bladder is found in lancelet, lamprey, or shark.A Guide to the Study of Fishes, Volume 1 (of 2) | David Starr Jordan
The lowest of the Vertebrata, the lancelet (see p. 140), has a larva of this kind.
British Dictionary definitions for lancelet
any of several marine animals of the genus Branchiostoma (formerly Amphioxus), esp B. lanceolatus, that are closely related to the vertebrates: subphylum Cephalochordata (cephalochordates): Also called: amphioxus
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for lancelet
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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.