Amphibia: Caudata: Ambystomatidae This Is A Species Account Which Talks About The Axolotl's Breeding, Diet, Definition, Distribution, Nomenclatural History, Fossil Record And Etymology.

1271 words - 5 pages

AMPHIBIA: CAUDATA: AMBYSTOMATIDAE AMBYSTOMA MEXICANUM _______________________________________________________________________________________________________Catalogue of American Amphibians and Reptiles.Amelingmeier, Amber. 2008. Ambystoma mexicanum.Ambystoma mexicanumAxolotl, Mexican Salamander, Mexican Walking FishAmbystoma mexicanum . Shaw, 1789."Holotype: BM, according to Smith and Taylor, 1948, Bull. U.S. Natl. Mus., 194: 8, but not there now. Type locality: given both as "Mexicanum" and "Mexico"." (Frost, 1985)Content. One genus, Ambystoma, with 30+ species.(Zug, Vitt, and Caldwell, 2001)Definition. Adults range in length from 6-18 inches (15-45cm), a size ranging up to 9 inches (23 cm) is common but greater than 12 inches (30 cm) is unusual. Axolotls have external gills as well as a caudal fin extending from behind the head to the vent. Their heads are usually wide, and their eyes are lidless. Their limbs are underdeveloped and have long, thin digits. Males are easily identified by their swollen cloacas lined near the papillae, while females are obvious for their broader bodies which are filled with eggs. There are three pairs of external gill stalks begin behind their heads which are used to move the oxygenated water. Axolotls have hardly visible vestigial teeth which possibly developed during metamorphosis. The primary method of feeding is through suction, where their rakers connect to close off the gill slits. There are four different colors within the Axolotls, two naturally occurring colors and two mutants. The varying shades of brown usually with spots are the two natural colors, which are the wild type and melanoid whom are black. The leucistic which is pale pink with black eyes and albino being golden, tan or pale pink with pink eyes are the other two mutant colors (Duellman & Trueb, 1994).FIGURE. Pictures taken once the egg is fertilized. Day 1 on the left and then after day 4 on the right. (Photographed and copyright holder, Jessica J. Miller) link : http://www.amphibiainfo.com/gallery/caudata/ambystomatidae/ambystoma/mexicanum/Breeding. Although the axolotl remains in larval form throughout its life, it becomes sexually mature between 12 and 18 months of age. The courtship occurs in water between the Axolotls.FIGURE. A picture of an albino Ambystoma mexicanum (Photographed and copyright holder, Jessica J. Miller) link: http://www.wallpaperfishtalk.com/wallpapers/freshwater/000073.jpgEach animal nudges the other's cloacal region and in due course leads to a "waltz," where both move in a circle. The male leaves as he moves his posterior part of his body and tail in a smooth rising-and-falling or side-to-side motion which causes the female follow. The male will then for about half a minute shake his tail vigorously to deposit numerous spermatophores, where he will move forward one body length. Once the male has laid the spermatophores, the female places herself over the spermatophores, also shaking her tail, and then picks up...

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