Adult: Species description based on Tanner and Brame (1961). Medium-sized salamander, females to approximately 132 mm, males to 128.8 mm. Twelve to thirteen costal grooves present. The tail is noticeably constricted near the base. Dorsal: Dorsal surface dark slatey grey with light red-brown mottling. The amount of light and dark coloration varies among individuals. The sides have large blotches of yellow. Ventral: The throat is dark grey, with the coloration darkening to black on the belly and tail. Extremities: Arms and legs have similar patterning to the dorsal surface, dark with light mottling.
Habitat: Lower montane and montane forest, from 1920-3444 m. Ecology: During the day, Bolitoglossa marmorea may be found under rocks. At night, it has been observed on mats of moss covering tree trunks. Type locality: Crater of Volcán Baru (Chiriquí), elevation 10,500 ft., Chiriquí Province, Panama Physiology: Description and histology of the oviduct may be found in Ehmcke et al (2002).