Asian elephant
The Asian elephant ("Elephas maximus"), also called Asiatic elephant, is the only living species of the genus "Elephas" and is distributed in the Indian subcontinent and Southeast Asia, from India and Nepal in the west to Borneo in the south. Three subspecies are recognised—"E. m. maximus" from Sri Lanka, "E. m. indicus" from mainland Asia and "E. m. sumatranus" from the island of Sumatra. The Asian elephant is the largest living land animal in Asia.
Elephant
Swedish zoologist Carl Linnaeus first described the genus "Elephas" and an elephant from Sri Lanka (then known as Ceylon) under the binomial "Elephas maximus" in 1758. In 1798, Georges Cuvier classified the Indian elephant under the binomial "Elephas indicus". Dutch zoologist Coenraad Jacob Temminck described the Sumatran elephant in 1847 under the binomial "Elephas sumatranus". English zoologist Frederick Nutter Chasen classified all three as subspecies of the Asian elephant in 1940. Asian elephants vary geographically in their colour and amount of depigmentation. The Sri Lankan elephant ("Elephas maximus maximus") inhabits Sri Lanka, the Indian elephant ("E. m. indicus") is native to mainland Asia (on the Indian subcontinent and Indochina), and the Sumatran elephant ("E. m. sumatranus") is found in Sumatra. One disputed subspecies, the Borneo elephant, lives in northern Borneo and is smaller than all the other subspecies. It has larger ears, a longer tail, and straighter tusks than the typical elephant. Sri Lankan zoologist Paules Edward Pieris Deraniyagala described it in 1950 under the trinomial "Elephas maximus borneensis", taking as his type an illustration in "National Geographic". It was subsequently subsumed under either "E. m. indicus" or "E. m. sumatranus". Results of a 2003 genetic analysis indicate its ancestors separated from the mainland population about 300,000 years ago. A 2008 study found that Borneo elephants are not indigenous to the island but were brought there before 1521 by the Sultan of Sulu from Java, where elephants are now extinct.