The species is endemic to the Mariana Islands.

[1][2] The specific name, slevini, is in honor of American herpetologist Joseph Richard Slevin.

[3] The preferred natural habitat of E. slevini is forest, at altitudes from sea level to 400 m (1,300 ft).

[1] E. slevini is a moderately large-sized species for its genus.

Adults have a snout-to-vent length of 5.8–8.5 cm (2.3–3.3 in).