a subregion of the Indo-Malayan zoogeographic land region; it covers all the mainland area of the region (except the southern part of the Malay Peninsula) and the islands of Sri Lanka, Hainan, Taiwan, and Ryukyu. The fauna of peninsular India differs significantly from the fauna of the remaining territory of the Indian-Indochinese subregion; therefore, two subregions are sometimes distinguished instead of the Indian-Indochinese subregion.