Nyctimystes

Nyctimystes is a genus of tree frogs in the subfamily Pelodryadinae of the family Hylidae. They are principally Papuan species, but also inhabit islands in the Moluccas. All species in this genus have one distinct feature that separates them from other species in the family, the lower eyelid is marked with pattern of lines, veins, or dots. This feature presumably acts as camouflage when the frogs are at rest during the day.

Species of this genus inhabit tropical or subtropical montane rainforest. The eggs are large and are laid on submerged objects in fast-flowing creeks and streams (not all species of this genus have been recorded as doing this, although it is assumed). The tadpoles have large sucker-mouths and their body shapes are very streamlined with large tail musculatures. All species of this genus have extensive webbing and large toe discs.

Species
Many of the species have relatively small population sizes, and not much is known about either individual species or the genus as a whole. The following species are recognised in the genus Nyctimystes:


 * 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