Malayemys subtrijuga is a species of turtle

Turtle

Turtles are reptiles of the order Testudines , characterised by a special bony or cartilaginous shell developed from their ribs that acts as a shield...

 in the Geoemydidae

Geoemydidae

Geoemydidae is the largest and most diverse family in the order Testudines with about 70 species. It includes the Eurasian pond and river turtles and Neotropical wood turtles.-Characteristics:...

 family. It was monotypic

Monotypic

In biology, a monotypic taxon is a taxonomic group with only one biological type. The term's usage differs slightly between botany and zoology. The term monotypic has a separate use in conservation biology, monotypic habitat, regarding species habitat conversion eliminating biodiversity and...

 within the genus Malayemys

Malayemys

Malayemys is a genus of turtle in the Geoemydidae family. It was considered monotypic until 2004, but as of 2010 consists of two species. Its found in several countries of Southeast Asia‎.-Taxonomy:The genus is attributed to Lindholm, 1931....

until Brophy (2004, 2005) revalidated (based on morphology) Malayemys macrocephala (Gray, 1859) long time considered to be a synonym of M. subtrijuga.

• Malayemys subtrijuga (Mekong snail-eating turtle) is found in the Mekong Basin of Cambodia
  Cambodia
  Cambodia , officially known as the Kingdom of Cambodia, is a country located in the southern portion of the Indochina Peninsula in Southeast Asia...
  
  , Laos
  Laos
  Laos Lao: ສາທາລະນະລັດ ປະຊາທິປະໄຕ ປະຊາຊົນລາວ Sathalanalat Paxathipatai Paxaxon Lao, officially the Lao People's Democratic Republic, is a landlocked country in Southeast Asia, bordered by Burma and China to the northwest, Vietnam to the east, Cambodia to the south and Thailand to the west...
  
  , southern Vietnam
  Vietnam
  Vietnam – sometimes spelled Viet Nam , officially the Socialist Republic of Vietnam – is the easternmost country on the Indochina Peninsula in Southeast Asia. It is bordered by China to the north, Laos to the northwest, Cambodia to the southwest, and the South China Sea –...
  
   and eastern Thailand
  Thailand
  Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...
  
  
• Malayemys macrocephala (Malayan snail-eating turtle) is found in central and southeastern Thailand
  Thailand
  Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...
  
  , southeastern Cambodia
  Cambodia
  Cambodia , officially known as the Kingdom of Cambodia, is a country located in the southern portion of the Indochina Peninsula in Southeast Asia...
  
  , Peninsular Thailand
  Thailand
  Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...
  
   and Malay Peninsular

The occurrence of the species in Indonesia is regarded by Brophy (2005) to be allochtonous i.e. non native (Sumatra

Sumatra

Sumatra is an island in western Indonesia, westernmost of the Sunda Islands. It is the largest island entirely in Indonesia , and the sixth largest island in the world at 473,481 km2 with a population of 50,365,538...

) or extinct (Java

Java

Java is an island of Indonesia. With a population of 135 million , it is the world's most populous island, and one of the most densely populated regions in the world. It is home to 60% of Indonesia's population. The Indonesian capital city, Jakarta, is in west Java...

)

Both species are threatened by habitat loss and overhunting.