lancelet

/lans-lit, lahns-/US // ˈlæns lɪt, ˈlɑns- //UK // (ˈlɑːnslɪt) //

小号,矛头指向

Definitions

n.名词 noun

1
- : 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.

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.
Nothing of the nature of lung or air-bladder is found in lancelet, lamprey, or shark.
The lowest of the Vertebrata, the Lancelet (see p. 140), has a larva of this kind.