Adult males measure 15–19 mm (0.6–0.7 in) and adult females 19–23 mm (0.7–0.9 in) in snout–vent length.
The snout is short and rounded.
No tympanum is present.
The finger and toe tips are narrow and rounded, without circumferential grooves; neither lateral fringes nor webbing is present.
The dorsal coloration ranges from pale gray to reddish brown to brownish olive.
There are scattered flecks and sometimes an X-shaped scapular mark.
Most specimens have dark grayish-brown canthal and supratympanic stripes.
Juveniles are paler in coloration, yellowish to reddish brown, bearing contrasting dark brown flecks and distinct canthal and supratympanic stripes.

Reproduction occurs by direct development, that is, there is no free-living tadpole stage.
The average egg diameter is 3.5 mm (0.14 in).
Adult males measure 15–19 mm (0.6–0.7 in) and adult females 19–23 mm (0.7–0.9 in) in snout–vent length. The snout is short and rounded. No tympanum is present. The finger and toe tips are narrow and rounded, without circumferential grooves; neither lateral fringes nor webbing is present. The dorsal coloration ranges from pale gray to reddish brown to brownish olive. There are scattered flecks and sometimes an X-shaped scapular mark. Most specimens have dark grayish-brown canthal and supratympanic stripes. Juveniles are paler in coloration, yellowish to reddish brown, bearing contrasting dark brown flecks and distinct canthal and supratympanic stripes.
Reproduction occurs by direct development, that is, there is no free-living tadpole stage. The average egg diameter is 3.5 mm (0.14 in).
Pristimantis attenboroughi