The brain of the Vertebrata is merely an expansion of one of the ganglions of the nervous cord of the mollusca and crustacea.
A blow dealt one of the Vertebrata on the head at once renders it insensible.
On the theory of evolution most in favour, the first Vertebrata were aquatic.
Such are the remains of what seem to have been the first Vertebrata.
The vertical lines separate the classes and sub-classes of Vertebrata from one another.
The lowest of the Vertebrata, the Lancelet (see p. 140), has a larva of this kind.
The ova of the Vertebrata differ greatly in size and structure.
A character common to all the groups of the Vertebrata is the possession of teeth.
Among the superior animals however, and especially among the Vertebrata, pain exists.
The Mammalia are unquestionably the highest of the Vertebrata.
Vertebrata Ver·te·bra·ta (vûr'tə-brā'tə, -brä'-)
A primary division of the phylum Chordata that includes the fishes, amphibians, reptiles, birds, and mammals, all of which are characterized by a segmented spinal column and a distinct, well-differentiated head.