vertebrata
脊椎动物门
脊椎动物门
Vertebrata n 1 :
fishes ;
amphibians ;
reptiles ;
birds ;
mammals [
synonym :
{
Vertebrata }, {
subphylum Vertebrata }, {
Craniata },
{
subphylum Craniata }]
Vertebrata \
Ver `
te *
bra "
ta \,
n .
pl . [
NL .] (
Zool .)
One of the grand divisions of the animal kingdom ,
comprising all animals that have a backbone composed of bony or cartilaginous vertebrae ,
together with Amphioxus in which the backbone is represented by a simple undivided notochord .
The Vertebrata always have a dorsal ,
or neural ,
cavity above the notochord or backbone ,
and a ventral ,
or visceral ,
cavity below it .
The subdivisions or classes of Vertebrata are Mammalia ,
Aves ,
Reptilia ,
Amphibia ,
Pisces ,
Marsipobranchia ,
and Leptocardia .
[
1913 Webster ]
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