WLeptolalax 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.
WLeptobrachella 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.
WLeptolalax 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.
WLeptolalax fritinniens is a species of frog in the family Megophryidae.
WLeptolalax 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.
WLeptolalax melanoleucus is a frog species in the family Megophryidae. It is endemic to Thailand, although it has a relatively wide distribution near the Burmese border from the Khlong Saeng Wildlife Sanctuary in the central peninsular Thailand northwards to the vicinity of Pilok in Thong Pha Phum District, southwestern mainland Thailand; it is expected to be found in Burma. The type collection consists of three males measuring 27–29 mm (1.1–1.1 in) in snout-vent length and a single female at 33 mm (1.3 in) SVL. Males can be found calling at night near small streams.
WLeptolalax minimus is a species of frog in the family Megophryidae.
WLeptolalax 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.
WLeptolalax 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.
WLeptolalax 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.