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Proteidea :: Proteidea (n. pl.) An order of aquatic amphibians having prominent external gills and four legs. It includes Proteus and Menobranchus (Necturus). Called also Proteoidea, and Proteida..

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

Apoda :: Apoda (n.) An order of Amphibia without feet. See Ophiomorpha.

Tadpole :: Tadpole (n.) The young aquatic larva of any amphibian. In this stage it breathes by means of external or internal gills, is at first destitute of legs, and has a finlike tail. Called also polliwig, polliwog, porwiggle, or purwiggy..

Precoracoid :: Precoracoid (n.) The anterior part of the coracoid (often closely united with the clavicle) in the shoulder girdle of many reptiles and amphibians.

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..

Roe :: Roe (n.) The ova or spawn of fishes and amphibians, especially when still inclosed in the ovarian membranes. Sometimes applied, loosely, to the sperm and the testes of the male..

Pharynx :: Pharynx (n.) The part of the alimentary canal between the cavity of the mouth and the esophagus. It has one or two external openings through the nose in the higher vertebrates, and lateral branchial openings in fishes and some amphibias..

Reptile :: Reptile (n.) One of the Reptilia, or one of the Amphibia..

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.

Ichthyoidal :: Ichthyoidal (a.) Somewhat like a fish; having some of the characteristics of fishes; -- said of some amphibians.

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

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..

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

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..

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

Amphibia :: Amphibia (n. pl.) One of the classes of vertebrates.

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

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..

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

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