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Vertebrata :: 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 Lep

Pylangium :: Pylangium (n.) The first and undivided part of the aortic trunk in the amphibian heart.

Congo Snake :: Congo snake () An amphibian (Amphiuma means) of the order Urodela, found in the southern United States. See Amphiuma..

Bufo :: Bufo (n.) A genus of Amphibia including various species of toads.

Urodela :: Urodela (n. pl.) An order of amphibians having the tail well developed and often long. It comprises the salamanders, tritons, and allied animals..

Articulary :: Articulary (n.) A bone in the base of the lower jaw of many birds, reptiles, amphibians, and fishes..

Discodactylia :: Discodactylia (n. pl.) A division of amphibians having suctorial disks on the toes, as the tree frogs..

Ganocephala :: Ganocephala (n. pl.) A group of fossil amphibians allied to the labyrinthodonts, having the head defended by bony, sculptured plates, as in some ganoid fishes..

Axolotl :: Axolotl (n.) An amphibian of the salamander tribe found in the elevated lakes of Mexico; the siredon.

Anallantoidea :: Anallantoidea (n. pl.) The division of Vertebrata in which no allantois is developed. It includes amphibians, fishes, and lower forms..

Amphibian :: Amphibian (n.) One of the Amphibia.

Derotremata :: Derotremata (n. pl.) The tribe of aquatic Amphibia which includes Amphiuma, Menopoma, etc. They have permanent gill openings, but no external gills; -- called also Cryptobranchiata..

Amphibiology :: Amphibiology (n.) A treatise on amphibious animals; the department of natural history which treats of the Amphibia.

Salamandroidea :: Salamandroidea (n. pl.) A division of Amphibia including the Salamanders and allied groups; the Urodela.

Perennibranchiate :: Perennibranchiate (a.) Having branchae, or gills, through life; -- said especially of certain Amphibia, like the menobranchus. Opposed to caducibranchiate..

Siren :: Siren (n.) Any long, slender amphibian of the genus Siren or family Sirenidae, destitute of hind legs and pelvis, and having permanent external gills as well as lungs. They inhabit the swamps, lagoons, and ditches of the Southern United States. The more common species (Siren lacertina) is dull lead-gray in color, and becames two feet long..

Batrachia :: Batrachia (n. pl.) The order of amphibians which includes the frogs and toads; the Anura. Sometimes the word is used in a wider sense as equivalent to Amphibia.

Amphipneust :: Amphipneust (n.) One of a tribe of Amphibia, which have both lungs and gills at the same time, as the proteus and siren..

Dipnoi :: Dipnoi (n. pl.) A group of ganoid fishes, including the living genera Ceratodus and Lepidosiren, which present the closest approximation to the Amphibia. The air bladder acts as a lung, and the nostrils open inside the mouth. See Ceratodus, and Illustration in Appendix..

Lagena :: Lagena (n.) The terminal part of the cochlea in birds and most reptiles; an appendage of the sacculus, corresponding to the cochlea, in fishes and amphibians..

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