from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. A taxonomic order within the subclass Lissamphibia — the salamanders and related amphibians.
from the GNU version of the Collaborative International Dictionary of English
- n.pl. An order of amphibians having the tail well developed and often long. It comprises the salamanders, tritons, and allied animals.
from The Century Dictionary and Cyclopedia
- An order of Amphibia; the tailed amphibians; the ichthyomorphic amphibians, which retain the tail throughout life, as distinguished from the Anura, or tailless batrachians.
Distribution of Proteus (Amphibia: Urodela: Proteidae) and its possible explanation.
It is well known, of course, that the Mexican axolotl (Amblystoma mexicanum) lives in salt lakes, but not even the classic work of W. Korngold, Caudate Amphibians (Urodela),
This is so, for instance, when the ectoderm of the presumptive mouth region is exchanged between the embryos of Urodela and Anura.
Anura ectoderm of the early gastrula, suction cups and horny jaws; in a tadpole, balancers arose from Urodela ectoderm.
 See a Paper on the "Axial Skeleton of the Urodela," in Proc.
The same species in other parts of North America normally goes through the metamorphosis, like other species of the Urodela.
The larva of the Urodela is probably more primitive than the tadpole of the
In the genera Bombinator and Diseoglossus, however, as also in the male Urodela, a still more intimate union exists between the renal organs and those devoted to functions complementary to oviposition.
Ribs, moreover, are found in the other existing orders of the frog's class, i.e. both in the Urodela and Ophiomorpha.
The geographical distribution of the Urodela is very remarkable.
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