''Nyctimystes cryptochrysos'' is a species of

tree frog A tree frog (or treefrog) is any species of frog that spends a major portion of its lifespan in trees, known as an arboreal state. Several lineages of frogs among the Neobatrachia suborder have given rise to treefrogs, although they are not clos ...

in the subfamily

Pelodryadinae Pelodryadinae, also known as Australian treefrogs (although not all members are arboreal), is a subfamily of frogs found in the region of Australia and New Guinea, and have also been introduced to New Caledonia New Caledonia ( ; ) is a g ...

, endemic to

Papua New Guinea Papua New Guinea, officially the Independent State of Papua New Guinea, is an island country in Oceania that comprises the eastern half of the island of New Guinea and offshore islands in Melanesia, a region of the southwestern Pacific Ocean n ...

. It lives on Fergusson Island between 900 and 1500 meters above

sea level Mean sea level (MSL, often shortened to sea level) is an mean, average surface level of one or more among Earth's coastal Body of water, bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical ...

. Scientists suspect it may also live in the

D'Entrecasteaux Islands D'Entrecasteaux Islands () are situated near the eastern tip of New Guinea in the Solomon Sea in Milne Bay Province of Papua New Guinea. The group spans a distance of , has a total land area of approximately and is separated from the Papua New G ...

. The adult male frog measures 48.2 to 50.6 mm in snout-vent length and the adult female frog 60.7 to 65.1 mm. Most of the skin of the dorsum is a mixture of light brown and dark brown in color. This frog has vertical lines on its lower

eyelid An eyelid ( ) is a thin fold of skin that covers and protects an eye. The levator palpebrae superioris muscle retracts the eyelid, exposing the cornea to the outside, giving vision. This can be either voluntarily or involuntarily. "Palpebral ...

s and gold coloring on its legs and groin. The scientific name of this species, ''chryptochrysos'', comes from the

Greek Greek may refer to: Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group *Greek language, a branch of the Indo-European language family **Proto-Greek language, the assumed last common ancestor of all kno ...

''kryptos'' for "hidden" and ''chrysos'' for "gold," referring to the gold color on the middle of this frog's body.

References

Amphibians described in 2012 Frogs of Asia cryptochrysos {{Pelodryadinae-stub