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Fejervarya limnocharis, the Field Frog, is a small member of the ricefield frog genus Fejervarya in the family Dicroglossidae, found in Southeast Asia and Indochina, including Indonesia, Malaysia, Thailand, Myanmar, Cambodia, Laos and Vietnam. Earlier reports of the species from South Asia are now considered misidentifications of related species, narrowing its confirmed range to the mainland and islands of Southeast Asia. It is one of the most familiar frogs of the region’s farmland, both as a resident of rice paddies and as food on local tables.
Identification
Fejervarya limnocharis is a small species even within its own genus: adult males measure about 39–43 mm in snout-vent length, well short of the bulk of larger relatives such as Fejervarya cancrivora (see Similar species below). In the breeding season, males can be told apart from females by their loose gular region marked with a brown or blackish W-shape and stronger forelimbs, a combination of throat pattern and build that is a useful field clue where the sexes might otherwise be confused.
Habitat and range
The species inhabits rice fields, the flooded farmland that covers much of lowland Southeast Asia, and is also commonly found in oil palm plantations in Malaysia, another habitat reshaped by agriculture. That comfort with farmed and plantation land, rather than untouched forest, helps explain why it turns up so reliably across Indonesia, Malaysia, Thailand, Myanmar, Cambodia, Laos and Vietnam: wherever paddies or plantations replace natural wetland, the species appears to follow. Older records placing it in South Asia have since been reassigned to related species, so its confirmed range sits entirely within Southeast Asia and Indochina.
Behaviour and breeding
Much of what distinguishes Fejervarya limnocharis in life is tied to breeding condition rather than year-round appearance: breeding males develop a loose, W-marked gular region and stronger forelimbs than females, traits that point to active competition or grappling among males at breeding sites, as in many related ricefield frogs. Its closeness to people shows up away from the breeding pond too: the species is commonly sold and eaten as food in Southeast Asia, including Thailand, Laos and Cambodia, where it is frequently collected for human consumption, a use that follows directly from how common and accessible it is in farmed wetland close to human settlements.
Conservation
The species’ facts box carries its current IUCN Red List category, Least Concern, consistent with a wide range across Southeast Asia and a demonstrated tolerance for farmed habitats such as rice paddies and oil palm plantations that displace many less adaptable amphibians. Taxonomically, the picture is less settled: molecular studies suggest Fejervarya limnocharis is a species complex that may comprise multiple distinct species, meaning some populations currently grouped under this name could eventually be split out, with conservation status assessed separately for each.
Similar species
Fejervarya limnocharis belongs to a genus of similarly built, ground-dwelling ricefield frogs across South and Southeast Asia, several of which share its farmland habitat. It is markedly smaller than its larger congener Fejervarya cancrivora, whose adult males and females alike exceed Fejervarya limnocharis’s 39–43 mm snout-vent length by a wide margin, and which, unlike Fejervarya limnocharis, tolerates brackish and saline coastal habitat rather than sticking to freshwater paddies. A small Fejervarya-type frog found inland in a rice field or oil palm plantation is far more likely to be this species than the larger, coastal-tolerant Fejervarya cancrivora.