- External gills in adult stage, as well as lungs.
Four reduced limbs, each with four toes.
Laterally compressed tail.
- Dark brown with tan flecks and dark spots.
Light ventral surface with dark spots.
Necturus beyeri can grow to an adult total length of 16-22 cm (6.5-9 in).
In the United States, the range of Necturus beyeri is split into two populations on either side of the Mississippi River: eastern Texas and western Louisiana, and eastern Louisiana and southern Mississippi.
Necturus beyeri hides under rocks and other debris along the stream edge where it eats crayfish and other invertebrates.
Breeding in Necturus beyeri occurs from April to June. This salamander has internal fertilization and females lay 40-70 eggs on the stream bottom.
Necturus beyeri is strictly aquatic and is found in the sandy bottoms of spring-fed creeks.
The Gulf Coast waterdog is not a protected species in Texas and can be legally collected with a hunting license.
In Texas, Necturus beyeri is found in the central portion of east Texas.