Northern Ravine Salamander Plethodon electromorphus

Description: Adult Morphology: A small, short-legged salamander, similar in both body shape and size to red-backed and zigzag salamanders. Unlike both of the aforementioned species, this salamander always lacks a dorsal stripe and is gray-black or dark brown in coloration. The legs are generally very short and the body is very elongate giving this salamander a more wormlike appearance than other similar species. The underbelly and chin are uniformly dark.

Size: Most individuals grow to a length of around 4in.

Juveniles: Juveniles are similar to adults.

Eggs: The egg-laying habits of this species are not well known, but are likely similar to those of other species in the genus.

Similar Species: The northern zigzag salamander (Plethodon dorsalis) and eastern red-backed salamander (Plethodon cinereus) are both very similar but often have an orange or yellow dorsal stripe and have lighter, "salt-and-peppered" chins. The zigzag salamander also has orange coloration around the axila ("armpits"). The red-backed salamander is sympatric (occurs side by side) throughout the range of this species and the zigzag salamander occurs alongside this species in eastern Jefferson and western Switzerland Counties. The northern dusky salamander (Desmognathus fuscus) is much more robust and generally brownish in coloration with a light line running from its eyes to its jaw. Though this salamander is sympatric with the ravine salamander, the dusky salamander tends to be found in much wetter microhabitats.

Distribution: This salamander has a relatively small range, occurring from southeastern Indiana and Ohio into West Virginia and southwestern Pennsylvania.

Ravine salamanders are found almost exclusively within the Switzerland Hills natural region in southeastern Indiana. They inhabit well-drained, hilly terrain as far north as Wayne and Henry Counties and as far south as western Jefferson County.

Activity: Ravine salamanders are surface active mainly during cooler weather and may be found under cover throughout the winter when the ground is not frozen. They are most active during the late winter and spring, but may be found reliably from September to May when the weather is mild. During the summer, they presumably retreat underground.

Breeding Season: Little is known about the breeding of this salamander, but breeding and egg deposition likely takes place sometime during the late winter and early spring.

Taxonomy: The northern ravine salamander (Plethodon electromorphus) has no subspecies. The northern ravine salamander belongs to the genus Plethodon and is in the family Plethodontidae which is represented in Indiana by 11 different species.

Ecology: Habitat: Ravine salamanders are a species of the deeply dissected, well drained hills of southeastern Indiana and appear to be common both in moist shaded forest, and on more exposed slopes. They are often found along stream corridors and on ridgetops, though rocky slopes seem to be their preferred habitat.

Diet: These salamanders feed on a variety of small invertebrates.

Reproduction and Life History: Ravine Salamanders, like all other species in the genus, have no larval stage and simply lay their eggs underground or under cover during spring. The young hatch out between late fall and the next spring.

Conservation: Though this species has a fairly restricted range in Indiana, they are apparently abundant where they occur and appear to adapt well to human-altered ecosystems; as is evident from their presence in and around old bridges and structures in the Whitewater Gorge of Richmond (Wayne County).

Literature

Conant, R. and J. T . Collins. 1998. Reptiles and Amphibians of Eastern and Central North America. Third Edition, Expanded. Houghton Mifflin, New York, New York

Minton, S. A. Jr. 2001. Amphibians and Reptiles of Indiana. Indiana Academy of Science, Indianapolis, IN

Petranka, J. W. 1998. Salamanders of the United States and Canada. Smithsonian Institute Press, Washington D.C.

Distribution Map
Distribution map of Northern Ravine Salamander (Plethodon electromorphus)
Photographs