Nyctimystes

, many frogs in the genus *Nyctimystes* have more webbing on their hind feet than on their front feet.]]
***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." 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* (Günther, 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, Günther, Tjaturadi, and Richards, 2021)
* *Nyctimystes montanus* (Peters et Doria, 1878) – Mountain big-eyed tree frog
* *Nyctimystes myolae* Menzies, 2014
* *Nyctimystes multicolor* (Günther, 2004) – Multi-coloured tree frog
* *Nyctimystes narinosus* Zweifel, 1958 – Common big-eyed tree frog
* *Nyctimystes nullicedens* (Kraus, 2018)
* *Nyctimystes obsoletus* (Lönnberg, 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.