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Iberian ribbed newt
The Iberian ribbed newt or Spanish ribbed newt (''Pleurodeles waltl'') is a newt endemic to the central and southern Iberian Peninsula and Morocco. It is known for its sharp ribs which can puncture through its sides, and as such is also called the sharp-ribbed newt.
==Description==
The Iberian ribbed newt has tubercles running down each side. Through these, its sharp ribs can puncture. The ribs act as a defense mechanism, causing little harm to the newt. This mechanism could be considered as a primitive and rudimentary system of inoculation,〔Bruna Azara, C. 1995. Animales venenosos. Vertebrados terrestres venenosos peligrosos para el ser humano en España. Bol. SEA, 11: 32-40.〕 but is completely harmless to humans.〔Bruna Azara, C. 1995. Animales venenosos. Vertebrados terrestres venenosos peligrosos para el ser humano en España. Bol. SEA, 11: 32-40 .〕 At the same time as pushing its ribs out the newt begins to secrete poison from special glands on its body. The poison coated ribs create a highly effective stinging mechanism, injecting toxins through the thin skin in predator’s mouths. The newt’s effective immune system and collagen coated ribs mean the pierced skin quickly regrows without infection.〔http://cabinetoffreshwatercuriosities.com/2010/11/11/spanish-ribbed-newt/ Spanish ribbed newt - ''Pleurodeles waltl'', The BioFresh Cabinet of Freshwater Curiosities〕
In the wild, this amphibian grows up to , but rarely more than in captivity. Its color is dark gray dorsally, and lighter gray on its ventral side, with rust-colored small spots where its ribs can protrude. This newt has a flat, spade-shaped head and a long tail, which is about half its body length. Males are more slender and usually smaller than females. The larvae have bushy external gills and usually paler color patterns than the adults.
''P. waltl'' is more aquatic-dwelling than many other European tailed amphibians. Though they are quite able to walk on land, most rarely leave the water, living usually in ponds, cisterns, and ancient village wells that were common in Portugal and Spain in the past. They prefer cool, quiet, and deep waters, where they feed on insects, worms, and tadpoles.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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