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vertebrata
v e r t e b r a t a hex:#118;#101;#114;#116;#101;#98;#114;#97;#116;#97;
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- Vertebrata - n. pl. - 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.
- Pisces - n. pl. - The class of Vertebrata that includes the fishes. The principal divisions are Elasmobranchii, Ganoidei, and Teleostei.
- Chordata - n. pl. - A comprehensive division of animals including all Vertebrata together with the Tunicata, or all those having a dorsal nervous cord.
- Anallantoidea - n. pl. - The division of Vertebrata in which no allantois is developed. It includes amphibians, fishes, and lower forms.
- Vertebrata - n. pl. - 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.
- Aves - n. pl. - The class of Vertebrata that includes the birds.
- Allantoidea - n. pl. - The division of Vertebrata in which the embryo develops an allantois. It includes reptiles, birds, and mammals.