The limestone salamander (Hydromantes brunus) is a member of the lungless salamander family. Discovered in 1952 , this species belongs to the only genus of salamanders found both in new and old world. It is endemic to a portion of the Merced River Canyon in Mariposa County, California.
The limestone salamander has a flattened body, head, webbed toes, and a short tail. It is typically 5.0-7.5 cm in length. Adults are brownish with a pale ventral surface; the male has oval-shaped mental gland. The species was originally thought to be life-birthing, but is now known to lay eggs. Young hatch in the egg and emerge fully formed, with no larval stage. They are yellowish greenish, darkening with age. Like all lungless salamanders, it respires through its skin.
Distribution and habitat
The genus Hydromantes is endemic to California. The limestone slamander occurs only in the Lower Merced River drainage, in several disparate localities, at elevations of 300–760 m in inhabits canyon slopes that are greater than 35 degrees. Habitats include moss-covered limestones outcroppings, chaparral, under rocks and logs in moist environments. During dry weather it stays underground in caves and rock crevices.
The limestone salamander is classified as Vulnerable by the IUCN, mostly because it is known from fewer than five locations (where the species appears to be uncommon but not rare). By the US Department of Fish and Game, it is classified as threatened. A proposed gold operation mine in Hell Hollow is thought to be the most immediate threat, in addition to general habitat loss due to construction of highways, quarries and dams. A portion of the Merced River Canyon is protected by the State of California and managed by the State Department of Fish and Game as the Limestone Salamander Ecological Reserve (~120 acres); a further 1,600 acres have been designated as the Limestone Salamander Area of Critical Environmental Concern.
- Hammerson, G.; Wake, D. (2004). "Hydromantes brunus". IUCN Red List of Threatened Species. Version 2014.2. International Union for Conservation of Nature. Retrieved 2014-09-29.
- Behler, John (1979). Field Guide to Reptiles and Amphibians. New York: Alfred A. Knopf. pp. 332–333. ISBN 0-394-50824-6.
- Gorman, Joe (1956-01-01). "Reproduction in Plethodont Salamanders of the Genus Hydromantes". Herpetologica. 12 (4): 249–259.
- "Hydromantes brunus — Limestone Salamander". Californiaherps. Retrieved 2016-11-27.
- Flannery, Colleen (December 2001). "Ecological Reserves: Special protection for special places". Outdoor California Magazine. Archived from the original on 2009-04-11.