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SALAMANDER . Salamanders in the restricted sense (genus Salamandra of N. Laurenti) are See also:close See also:allies of the newts, but of exclusively terrestrial habits, indicated by the shape of the tail, which is not distinctly compressed. The genus is restricted in its See also:habitat to the western parts of the Palaearctic region and represented by four See also:species only: the spotted salamander, S. maculosa, the well-known See also:black and yellow creature inhabiting Central and See also:Southern See also:Europe, See also:North-See also:West See also:Africa and See also:South-Western See also:Asia; the black salamander, S. atra, restricted to the See also:Alps; S. caucasica from the See also:Caucasus, and S. luschani from Asia See also:Minor. Salamanders, far from being able to withstand the See also:action of See also:fire, as was believed by the ancients, are only found in See also:damp places, and emerge in misty See also:weather only or after thunderstorms, when they may appear in enormous See also:numbers in localities where at other times their presence would not be suspected. They are usually much dreaded by See also:country See also:people, and filthough they are quite harmless to See also:man, the large glands which are disposed very regularly on their smooth, shiny bodies, secrete a very active, milky See also:poison which protects them from the attacks of many enemies. The breeding habits of the two well-known See also:European species are highly interesting. They pair on See also:land, the male clasping the See also:female at the arms, and the impregnation is See also:internal. See also:Long after pairing the female gives See also:birth to living See also:young. S. maculosa, which lives in plains or at See also:low altitudes (up to 3000 ft.), deposits her young, ten to fifty in number, in the See also:water, in springs or cool rivulets, and these young at birth are of small See also:size, provided with See also:external gills and four limbs, in every way similar to advanced See also:newt larvae. S. atra, on the other See also:hand, inhabits the Alps between 2000 and 9000 ft. See also:altitude. Localities at such altitudes not being, as a See also:rule, suitable for larval See also:life in the water, the young are retained in the uterus, until the completion of the See also:metamorphosis. Only two young, rarely three or four, are See also:born, and they may measure as much as 5o mm. at birth, the See also:mother measuring only 120. The uterine eggs are large and numerous, as in S. maculosa, but as a rule only one fully develops in each uterus, the embryo being nourished on the yolk of the other eggs, which more or less dissolve to See also:form a large See also:mass of nutrient See also:matter. The embryo passes through three stages—(1) still en-closed within the See also:egg and living on its own yolk; (2) See also:free, within the vitelline mass, which is directly swallowed by the mouth; (3) there is no more vitelline mass, but the embryo is possessed of long external gills, which serve for an See also:exchange of nutritive fluid through the maternal uterus, these gills functioning in the same way as the chorionic villi of the mammalian egg. Embryos in the second See also:stage,if artificially released from the uterus, are able to live in water, in the same way as similarly See also:developed larvae of S. maculosa. But the uterine gills soon See also:wither and are See also:shed, and are replaced by other gills differing in no respect from those of its congener. Additional information and CommentsThere are no comments yet for this article.
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