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Labyrinthodon :: Labyrinthodon (n.) A genus of very large fossil amphibians, of the Triassic period, having bony plates on the under side of the body. It is the type of the order Labyrinthodonta. Called also Mastodonsaurus..

Cloaca :: Cloaca (n.) The common chamber into which the intestinal, urinary, and generative canals discharge in birds, reptiles, amphibians, and many fishes..

Operculum :: Operculum (n.) The fold of integument, usually supported by bony plates, which protects the gills of most fishes and some amphibians; the gill cover; the gill lid..

Synantherous :: Synangium (n.) The divided part beyond the pylangium in the aortic trunk of the amphibian heart.

Urostyle :: Urostyle (n.) A styliform process forming the posterior extremity of the vertebral column in some fishes and amphibians.

Vent :: Vent (n.) The anal opening of certain invertebrates and fishes; also, the external cloacal opening of reptiles, birds, amphibians, and many fishes..

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

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

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

Ophiomorpha :: Ophiomorpha (n. pl.) An order of tailless amphibians having a slender, wormlike body with regular annulations, and usually with minute scales imbedded in the skin. The limbs are rudimentary or wanting. It includes the caecilians. Called also Gymnophiona and Ophidobatrachia..

Stegosauria :: Stegocephala (n. pl.) An extinct order of amphibians found fossil in the Mesozoic rocks; called also Stegocephali, and Labyrinthodonta..

Trachystomata :: Trachystomata (n. pl.) An order of tailed aquatic amphibians, including Siren and Pseudobranchus. They have anterior legs only, are eel-like in form, and have no teeth except a small patch on the palate. The external gills are persistent through life..

Caecilian :: Caecilian (n.) A limbless amphibian belonging to the order Caeciliae or Ophimorpha. See Ophiomorpha.

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..

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..

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..

Monocardian :: Monocardian (a.) Having a single heart, as fishes and amphibians..

Coracoid :: Coracoid (a.) Pertaining to a bone of the shoulder girdle in most birds, reptiles, and amphibians, which is reduced to a process of the scapula in most mammals..

Web :: Web (n.) The membrane which unites the fingers or toes, either at their bases, as in man, or for a greater part of their length, as in many water birds and amphibians..

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