Rough-skinned newt (Taricha granulosa)

Close up of an adult rough-skinned newt on a log.
Rough-skinned newt  (Chayse Emge)
Category: Amphibians
Family: Salamandridae - Newts
If you see this species, please share your observation using the WDFW wildlife reporting form. Providing detailed information such as a photo and exact coordinates will improve the confidence and value of this observation to WDFW species conservation and management.

This species is common and occurs throughout western Washington. No widespread declines have been documented.

According to NatureServe, the state conservation status of the rough-skinned newt population is considered “secure” in Washington.

Description and Range

Physical description

A medium to large-sized, stocky, brown salamander with a rounded snout, rough glandular skin, and a bright orange underside. Aquatic phase males are similar but have smoother skin, enlarged forearms and a laterally flattened tail with a small but distinct tail fin. Adults are 2.4 to 3.5 inches snout to vent length and 4.33 to 7 inches total length.

In comparison, torrent salamanders (Rhyacotriton spp.) differ in having costal grooves, smooth skin, large eyes, white speckling on the sides of the body and the males have squared cloacal lobes. Torrent salamanders are also much smaller (adult 1.8 to 2.2 inches snout to vent length) than rough-skinned newts.

During the breeding season male rough-skinned newts have conspicuously swollen vent lobes while females have only a slight conical swelling around the vent.

Newly transformed juvenile newts resemble terrestrial adults.

Underwater close up of a rough-skinned newt larva.
Underwater view of a rough-skinned newt larva. W.P. Leonard, Copyright

Larvae 

The larvae are pond-type with large gills and a high tail fin. Rough-skinned newts are our only salamander larvae that have eyes on the margins of the head and a snout that narrows in front of the eyes. A faint horizontal stripe is present from the snout through the eye, and one or two distinct rows of white spots occur on the sides. A salmon-colored area is present on the underside of the chest. Metamorphosis takes place when larvae are approximately 1.2 to 2.75 inches in total length.

Eggs 

The rough-skinned newt is one of only three Washington amphibians (includes tiger salamander and long-toed salamander) that lays single eggs, but it is the only one that hides its eggs within vegetation. The ova are small (0.7 inches diameter). The ovum (egg) is tan above and cream below with a thin layer of jelly surrounding the capsule. The jelly retains its shape out of water.

In comparison, tiger salamanders lay similar sized single eggs but attach them to vegetation where the eggs are exposed. Long-toed salamanders have single eggs that are larger (greater than 0.4 inches diameter including gel) with gel that does not hold its shape out of water.

For more details about rough-skinned newt, see the Washington Herp Atlas.

Ecology and life history

Mesic forests are the main terrestrial habitat occupied by this species. Activity in terrestrial habitats occurs primarily when temperatures are moderate and the ground is wet. Activity can be diurnal or nocturnal. Breeding habitats include ponds, wetlands, lakes, road ditches and slow-moving creeks.

At low elevation sites in western Washington, rough-skinned newts are active year-round. Terrestrial forms can be observed migrating in streams and creeks to ponds starting in January.

Underwater view of 3 rough-skinned newts embracing during breeding season
Underwater view of rough-skinned newts clasping during breeding season.

Courtship displays and pairs in amplexus are most obvious in March and April at low elevation sites. Newts that occur at higher elevations start breeding soon after snow and ice melt. Eggs are laid soon after mating takes place. Newts are the last of our salamander species to breed and the last salamander larvae to hatch.

When threatened, newts arch the head towards the tail (“unken reflex”). This posture reveals the bright orange coloration of the underside that warns predators of its toxicity. With the exception of the common garter snake (Thamnophis sirtalis), few vertebrate predators can survive ingesting a rough-skinned newt. The highly toxic nature of this species allows them to be one of the few terrestrial salamanders active and conspicuous during the day. The toxin (tetrodotoxin) is produced within the skin, not secreted. Newts can be handled safely but care should be taken with small children prone to putting things in their mouths. After handling any amphibian, one should avoid touching the mucus membranes of the eyes, nose and mouth until hands have been washed.

Geographic range

In Washington, rough-skinned newts occur primarily west of the Cascade Crest in the Pacific Coast, Puget Trough and West Cascades Ecoregions. They also occur east of the Cascade Crest in some areas of the East Cascades Ecoregion.

This map from the Washington Herp Atlas illustrates the known distribution of the long-toed salamander in Washington as of 2016. 

Northwestern salamander distribution map of Washington: detections in all westside counties and 4 eastside ones as of 2016.
Washington Herp Atlas (2017)

For a map of range-wide distribution and conservation status of this species, check out NatureServe Explorer and the International Union for Conservation of Nature Redlist

Regulations

Licenses and permits

Be advised that collection of this species is only permitted under a WDFW Scientific Collection Permit for research and educational activities.

Conservation

The state conservation status of the northwestern salamander is “secure” based on the assumption that it is common according to the most current records.

In some areas, newts migrate in large groups to breeding ponds. If the migratory path crosses a road with heavy traffic, mortality can be high and could potentially threaten a local population.

Batrachochytrium salamandrivorans (Bsal) is a pathogenic chytrid fungus disease that infects amphibian species. Salamanders, particularly newts, seem to be the most susceptible. In western Europe, this disease has wiped out certain species of newts from entire areas. As far as we know, it is not yet in the United States.

Resources

References

Corkran, C. C. and C. Thoms. 1996. Amphibians of Oregon, Washington and British Columbia. Lone Pine, Redmond, Washington. 175 pp.

Nussbaum, R. A., E. D. Brodie, Jr., and R.M. Storm. 1983. Amphibians and Reptiles of the Pacific Northwest. University of Idaho Press, Moscow, Idaho. 332 pp.

Stebbins, R. C. and C. H. Lowe. 1951. Subspecific differentiation in the Olympic Salamander Rhyacotriton olympicus. University of California Publications in Zoology 50: 465-484.

WDFW publications

WDFW educational resources

Other resources