Leptolalax is a genus of frogs in the family Megophryidae. They are sometimes known as Asian toads, metacarpal-tubercled toads, or slender litter frogs, although many species-specific common names do not follow these conventions, and many species do not have common names. They are widely distributed in southeastern and eastern Asia, from southern China and northeastern India to the Malay Peninsula and Borneo. Leptolalax are typically small and have a cryptic colour pattern and no obvious morphological characters useful in systematic studies. Consequently, both molecular genetic analyses and analysis of advertisement calls by male frogs have been important in identifying new species.
Leptobrachella arayai is a species of frog in the family Megophryidae. It is endemic to Sabah, Malaysia. In addition to its type locality, Mount Kinabalu, it is known from Mount Trusmadi, Crocker Range, and Mendolog. Its natural habitats are tropical moist lowland forests, moist montane forests, and rivers. It is threatened by habitat loss.
Leptolalax bourreti is a frog species in the family Megophryidae. It is known with certainty only from the vicinity of its type locality in Sa Pa in northern Vietnam. Earlier records from Laos refer to Leptolalax eos and those from Thailand probably to an unnamed species. Its natural habitats are subtropical moist lowland forests, moist montane forests, and rivers. Its status is insufficiently known.
Leptolalax gracilis is a frog species in the family Megophryidae. It is endemic to northern Borneo: Brunei, Kalimantan (Indonesia), and Sarawak (Malaysia). Earlier record from the Malay Peninsula and Thailand refer to other species. Its natural habitats are tropical moist lowland forests, moist montane forests, and rivers. It is becoming rare due to habitat loss.
Leptolalax hamidi is a frog species in the family Megophryidae. It is endemic to Borneo, where it can be found both in western Sarawak, Malaysia, and Kalimantan, Indonesia. Its natural habitats are tropical moist lowland hilly forests and rivers. It is threatened by habitat loss (logging).
Leptolalax heteropus is a frog species in the family Megophryidae. It is found in the Malay Peninsula, both in Malaysia and southern Thailand. The type locality is Maxwell Hill in Taiping, Perak, Malaysia. Its natural habitats are tropical moist lowland forests, moist montane forests, and rivers. It is not considered threatened by the IUCN.
Leptobrachella kajangensis, also known as the Kajang slender litter frog, is a species of amphibian in the family Megophryidae. It is endemic to Malaysia and only known from its type locality, a small cave near the top of Gunung Kajang, on Tioman Island, a small island located 32 km off the east coast of Peninsular Malaysia.
Leptolalax nahangensis is a frog species in the family Megophryidae. It is endemic to Tuyên Quang Province, northern Vietnam. Its natural habitats are subtropical moist lowland forests, rivers, and caves. Its status is insufficiently known. This species has only been found near the entrance to a cave in Na Hang Nature Reserve.
Leptolalax pelodytoides is a frog species in the family Megophryidae. It is known with reasonable certainty only from near its type locality, the Karen Hills region in the Kayah State, eastern Myanmar. As Leptolalax pelodytoides was one of the first megophryid species to be described from the region, later research has shown that many specimens that have been reported as L. pelodytoides represent other species, including Leptolalax bourreti, Leptolalax oshanensis, Leptolalax eos, and Leptolalax minimus. A consequence is that the most recent IUCN assessment reports much broader distribution for this species than what can be ascertained.
Leptolalax pluvialis is a frog species in the family Megophryidae. It is only known from its type locality, Fansipan mountain range in northern Vietnam, although it is expected to be found also in adjacent Yunnan, China. Its natural habitats are subtropical moist montane forests and rivers. Its status is insufficiently known.
Leptolalax sungi is a frog species in the family Megophryidae. It is found in Vĩnh Phúc and Lào Cai Provinces in northern Vietnam and in Guangxi in southern China. Its natural habitats are subtropical moist lowland forests, moist montane forests, and rivers. Its status is insufficiently known. This species was first found along a stream near Tam Đảo village, about 925 meters ASL.
Leptolalax kecil is a species of megophryid frogs found in the Cameron Highlands of Peninsular Malaysia. It is only known from its type locality, but it is expected to have a wider distribution in the Cameron Highlands. This species may have been erroneously identified as Leptolalax gracilis.
Leptolalax khasiorum is a species of frogs belonging to the genus Leptolalax. It is so far reported only from the type locality, from the subtropical wet forests of Mawphlang in Khasi Hills, Meghalaya, India. It is a small amphibian; the male measuring 25.6 mm, and female 32.5 mm. The species is diagnosed with unique features such as eyelids with tubercles, distinct tympanum and supratympanic folds, undilated toe tips with dermal fringes, dorsum with dark blotches, flanks with large dark blotches, dark tympanic mask, limbs with dark cross-bars, and distinct color patches.
Leptolalax applebyi is a species of frogs in the family Megophryidae. It is endemic to Vietnam where it is only known from near its type locality, Song Thanh Nature Reserve, Phước Sơn District in Quảng Nam Province of central Vietnam.
Leptolalax fuliginosus is a frog species in the family Megophryidae. It is endemic to Thailand where it is only known from its type locality, Pa Lao U in Prachuap Khiri Khan Province. Only four specimens were collected, all of them males, measuring 28–30 mm (1.1–1.2 in) in snout-vent length.
Leptolalax solus is a frog species in the family Megophryidae. It is endemic to Thailand where it is only known from its type locality, Hala Bala Wildlife Sanctuary in Narathiwat Province near the Malaysian border; it is likely that its range extends to Malaysia. The type collection consists of a single adult frog, which measured 28 mm (1.1 in) in snout-vent length.
Leptolalax croceus is a species of toad in the family Megophryidae. Discovered in the Central Vietnam in 2010, it is endemic to the region as it is only known from its type locality, Ngoc Linh Nature Reserve in Đắk Glei District, Kon Tum Province. However, given the vicinity of the border to Laos it is also likely to be found there. Its belly has light orange color, which is unique among Leptolalax. It is a medium-sized species within its genus: snout-vent length of 16 males was in the range 22–27 mm (0.87–1.06 in). The species was found from evergreen forest at about 1,300 m (4,300 ft) elevation.
Leptolalax melicus is a frog species in the family Megophryidae. It is endemic to Cambodia where it is only known from near its type locality, Virachey National Park, Ratanakiri Province; it is expected to have a wider distribution that may reach Laos and Vietnam. Leptolalax melicus have only been found near rocky streams in evergreen forest between 650–850 m (2,130–2,790 ft) altitude.
Leptobrachium masatakasatoi is a species of frog in the family Megophryidae. It is known from its type locality, Phu Pan in Houaphanh Province in northeastern Laos, and from Sơn La Province in northwestern Vietnam. The specific name masatakasatoi honors professor Masataka Sato, Japanese entomologist who collected the holotype. Common name Masatakasato’s eyebrow toad has been proposed for this frog.
Leptobrachella lateralis is a species of frog in the family Megophryidae. It was first described by John Anderson (1871), who originally named it Ixalus lateralis. The holotype is lost and its exact origins are uncertain, but it was likely collected "from some portion of the surrounding region [of Bhamò]", Myanmar. It is only known with confidence from the region of its type locality and from Nagaland in Northeast India. Its range might extend into Yunnan, China. It is sometimes called Nagaland Asian toad or Nagaland leaf litter toad.
