Gulf Coast waterdog
|Gulf Coast waterdog|
Gulf Coast waterdogs grow to lengths of 6.0-8.5 inches and are an overall brown in color, with lighter brown and black speckling. Due to their entirely aquatic nature, their legs are short, with four-toed feet. They have external gills, which look like feathery appendages on either side of their heads. They have paddle-shaped, flattened tails. Gulf Coast waterdogs have the largest known amphibian genome, with over 100 billion base pairs.
They have lungs as well as gills, and they are typically found hiding among rocks in clear, spring-fed streams with sandy bottoms. They will consume almost any small aquatic invertebrate they can catch.
The controversy over the taxonomy of the genus Necturus has been significant, particularly in regard to N. alabamensis, N. beyeri, and N. maculosus. However, electrophoretic evidence suggests N. beyeri is a distinct species 
- (Petranka, 1998).
- Hammerson (2004). Necturus beyeri. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 9 May 2006. Database entry includes a range map and a brief justification of why this species is of least concern
- IUCN RangeMap: Necturus beyeri
- Herps of Texas: Necturus beyeri
- Amphibian Species of the World: Necturus beyeri
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