Desmognathus balsameus

This species is small (~19–47mm SVL), with a tail shorter than the body (up to ~90% SVL) that is round in cross section along its length. It is differentiated from D. santeetlah by the lack of any keeling on the dorsal surface of the tail (vs. presence in santeetlah), which is the only species in its range with which it is likely to be confused. D. balsameus exhibits a wide range of color patterns, with most individuals possessing a partially or mostly complete dorsal stripe with wavy or undulating edges (vs. usually straight in D. adatsihi), formed from the irregular invasion of melanophore patches between the remnants of paired larval spots, with a brownish, yellowish, or reddish coloration against a darker lateral ground color, and a general lack of any regular patterning along the mid-dorsal line. Ontogenetic darkening seems to be relatively more common and at smaller sizes than in related species, with individuals as small as ~33mm SVL exhibiting overall dark brown to blackish coloration obscuring the dorsal pattern (Pyron and Beamer 2022).

This species is found above 1000 m elevation in the Great Balsam Mountains in montane forests with cool, clear-flowing headwater streams and seepages (Pyron and Beamer 2022, Petranka et al. 2024). The species can be abundant on wet rock faces (Huheey and Brandon 1973). It is more terrestrial at higher elevations and is a characteristic inhabitant of the floor of spruce-fir forests (Petranka 1998, Pyron and Beamer 2022). Individuals frequently climb plants on rainy nights (Petranka 1998). Eggs are laid in wet rock crevices or under rocks, logs, or moss in seepage areas or near small streams, usually at or slightly above the water surface (Pope 1924, Huheey and Brandon 1973, Forester 1979, Petranka 1998).

Population density on rock faces was 11-22 adults and 7-19 juveniles per square meter (Huheey and Brandon 1973). Rock-face densities generally exceed those of streamside habitats (Petranka 1998). Individuals in a rock-face population averaged 40-45 cm between successive captures (Huheey and Brandon 1973).

Mating occurs in spring and late summer-fall (Huheey and Brandon 1973, Forester 1979). Egg laying occurs in July and early August or as late as early September (Huheey and Brandon 1973). Females attend their clutches through hatching, and this may contribute significantly to nesting success (Forester 1979, Petranka 1998). Multiple females often nest close together (Pope 1924, Forester 1979). The larval period lasts at least 9 months in rock face populations (Huheey and Brandon 1973).