N. alabamensis is medium-sized (15–22 centimetres or 5.9–8.7 inches), with four toes and a laterally compressed tail. Its gills are permanent, bushy, and red. Typical adults exhibit a brown or black dorsum with minimal or no spotting, and the ventral side is white and often not spotted.
Distribution and habitat
The Alabama waterdog is found in the Appalachian headwaters of the Black Warrior River drainage basin in Alabama. Its range includes the Sipsey Fork and Brushy Creek in Winston County, the Mulberry Fork, Blackwater Creek and Lost Creek in Walker County, the North River and Yellow Creek in Tuscaloosa County, and the Locust Fork and Blackburn Fork in Blount County. It is found in unsilted small and medium sized streams in clay areas. It is more likely to be present when the larvae of the northern dusky salamander (Desmognathus fuscus) is present and less likely in streams where the Asiatic mussel (Corbicula sp.) is abundant. The areas of dead leaves and detritus sometimes found in backwaters are important for this species.
The taxonomy of N. alabamensis is poorly understood. It is believed to be related to N. maculosus and N. beyeri. It is known to hybridize with N. beyeri, though electrophoretical evidence suggests they are separate species.
The survival of N. alabamensis is threatened by habitat fragmentation and pollution and the IUCN has listed it as "Endangered". The quality of the water has deteriorated due to due to industrial, mining, agricultural and urban pollution and various impoundments have been made inhibiting its free movement. Even within the best habitats within their range they are uncommon and their abundance may fluctuate.
- Geoffrey Hammerson, Mark Bailey (2004). "Necturus alabamensis". IUCN Red List of Threatened Species. Version 2012.2. International Union for Conservation of Nature. Retrieved May 14, 2013.
- Bailey, Mark A. "Necturus alabamensis Viosca, 1937: Black Warrior Waterdog". AmphibiaWeb. Retrieved 2014-01-09.
- Petranka, James W. (1998) Salamanders of the United States and Canada, Washington and London: Smithsonian Institution Press.