Hapalomys longicaudatus Blyth, 1859 . J. Asiat. Soc. Bengal, 28:296.

TYPE LOCALITY: Burma, Tenasserim, Sitang River Valley .

DISTRIBUTION: SE Burma, SW and peninsular Thailand, and Malaya Peninsula; limits unknown.

COMMENTS: Karyotype uninformative about phylogenetic relationships (Yong, et al., 1982). Spermatozoal morphology similar to that of Chiropodomys and Maxomys, which also resembled the basic structure found in species of Mus and Apodemus (Breed and Yong (1986). Among Sundaic genera, H. longicaudatus may be most closely related to Chiropodomys, based on external and cranial traits (Musser and Newcomb, 1983).