- Large and stout salamander with a short, broad head.
Tail shorter than body length.
Four toes on forelimbs, and five on hind limbs.
Eleven or twelve costal grooves.
- Dark gray or black dorsal and ventral surfaces.
Silver or white "crossbars" mark the dorsum, sometimes fusing with spots.
Ambystoma opacum grows to a total length of 7.5-12.5 cm (3-5 in) as an adult.
In North America, Ambystoma opacum is found from New England to Florida and Illinois to Texas.
Ambystoma opacum is rarely seen in water, but remains near it in moist areas.
Breeding in Ambystoma opacum occurs throughout the fall. Females lay 50-200 eggs on land and guard them until rainwater comes, triggering hatching.
Ambystoma opacum prefers drier environments than many salamander species, but it remains near water and is commonly seen in wooded areas.
The marbled salamander is not a protected species in Texas and can be legally collected with a hunting license.
In Texas, Ambystoma opacum is found in east Texas from the Red River to the Gulf of Mexico.