Nyctimystes

Nyctimystes is a genus of tree frogs in the family Pelodryadidae. Most of them are from Papua New Guinea but some live on the Moluccas islands. Some scientists think Nyctimystes should be considered part of Litoria, another genus of frogs from New Guinea. Other scientists think that it is right to say Nyctimystes is its own genus.
All frogs in Nyctimystes have marks on their lower eyelids: lines, veins, or dots. Scientists think this helps the frog harder to see so it can hide from larger animals that want to eat it. Scientists tell Nyctimystes frogs apart from Litoria frogs because Nyctimystes frogs have vertical (up and down) pupils in their eyes and Litoria frogs have horizontal (side to side) pupils in their eyes.
These frogs live in tropical or subtropical rainforests on mountains. Their eggs are large and scientists have seen many of them laying eggs on underwater objects in fast-flowing creeks and streams, enough that they think all Nyctimystes frogs do this. The tadpoles have large sucker-mouths and streamlined bodies with large, muscular tails. All Nyctimystes frogs have webbed feet and large discs on their toes for climbing.
Scientists say most Nyctimystes frogs became separate species during the Miocene era, about 10 to 22 million years ago.
The name comes from the Greek nycktos for "night" and myst meaning "mist." Together they refer to "mysteries of the night."
Species
Many of these frogs are few in number in the wild, and scientists do not know much about most of them. Scientists often write papers saying a frog species should be renamed and moved from Nyctimystes into Litoria or Ranoidea, so the list below may change:
Nyctimystes avocalis Zweifel, 1958 - Loud big-eyed tree frog
Nyctimystes bivocalis Kraus, 2012
Nyctimystes brevipalmatus (Tyler, Martin, and Watson, 1972) - Green-thighed frog
Nyctimystes calcaratus Menzies, 2014
Nyctimystes cheesmani Tyler, 1964 - Cheesman's big-eyed tree frog
Nyctimystes cryptochrysos Kraus, 2012
Nyctimystes daymani Zweifel, 1958 - Dayman big-eyed tree frog
Nyctimystes disruptus Tyler, 1963 - Madang big-eyed tree frog
Nyctimystes dux (Richards and Oliver, 2006)
Nyctimystes eucavatus Menzies, 2014
Nyctimystes fluviatilis Zweifel, 1958 - Indonesian big-eyed tree frog
Nyctimystes foricula Tyler, 1963 - Kaironk big-eyed tree frog
Nyctimystes gramineus (Boulenger, 1905) - Northern New Guinea treefrog
Nyctimystes granti (Boulenger, 1914) - Grant's big-eyed tree frog
Nyctimystes gularis Parker, 1936 - Mondo big-eyed tree frog
Nyctimystes humeralis (Boulenger, 1912) - Green big-eyed tree frog
Nyctimystes hunti (Richards, Oliver, Dahl, and Tjaturadi, 2006)
Nyctimystes infrafrenatus (Gunther, 1867) - White-lipped tree frog
Nyctimystes intercastellus Kraus, 2012
Nyctimystes kubori Zweifel, 1958 - Sandy big-eyed tree frog
Nyctimystes kuduki Richards, 2007
Nyctimystes latratus Menzies, 2014
Nyctimystes lubisi (Oliver, Gunther, Tjaturadi, and Richards, 2021)
Nyctimystes montanus (Peters et Doria, 1878) - Mountain big-eyed tree frog
Nyctimystes myolae Menzies, 2014
Nyctimystes multicolor (Gunther, 2004) - Multi-coloured tree frog
Nyctimystes narinosus Zweifel, 1958 - Common big-eyed tree frog
Nyctimystes nullicedens (Kraus, 2018)
Nyctimystes obsoletus (Lonnberg, 1900) - Simbang big-eyed tree frog
Nyctimystes ocreptus Menzies, 2014
Nyctimystes pallidofemora (Kraus, 2018)
Nyctimystes papua (Boulenger, 1897) - Papua big-eyed tree frog
Nyctimystes perimetri Zweifel, 1958 - Archipelago big-eyed tree frog
Nyctimystes persimilis (Zweifel, 1958) - Milne big-eyed tree frog
Nyctimystes pterodactyla (Oliver, Richards, and Donnellan, 2019) - Pale-eyed parachuting tree frog
Nyctimystes pulcher (Wandolleck, 1911) - Spurred big-eyed tree frog
Nyctimystes purpureolatus (Oliver, Richards, Tjaturadi, and Iskandar, 2007)
Nyctimystes sanguinolenta (Van Kampen, 1909) - Sabang tree frog
Nyctimystes sauroni (Richards and Oliver, 2006)
Nyctimystes semipalmatus Parker, 1936 - Kokoda big-eyed tree frog
Nyctimystes trachydermis Zweifel, 1983 - Morobe big-eyed tree frog
Nyctimystes traunae Menzies, 2014
Nyctimystes tyleri Zweifel, 1983 - Tyler's big-eyed tree frog
Nyctimystes zweifeli Tyler, 1967 - Zweifel's big-eyed tree frog
References
The IUCN Redlist - Nyctimystes
Barker, J.; Grigg, G.C.; Tyler, M.J. (1995). A Field Guide to Australian Frogs. Surrey Beatty & Sons.
Frogs of Oceania