Hapalomys Blyth 1859

Wilson, Don E. & Reeder, DeeAnn, 2005, Order Rodentia - Family Muridae, Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2, Baltimore: The Johns Hopkins University Press, pp. 1189-1531 : 1328

Hapalomys Blyth 1859

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

Type Species: Hapalomys longicaudatus Blyth 1859

Species and subspecies: 2 species:

Species Hapalomys delacouri Thomas 1927

Species Hapalomys longicaudatus Blyth 1859

Discussion: Micromys Division. Reviewed by Musser (1972). One of the few murine genera with representatives in both Indochina and on the Sunda Shelf ( Musser and Newcomb, 1983). Although molar occlusal patterns are highly derived, they are more similar to those of Chiropodomys than to any other extant Asian murine ( Chaimanee, 1998; Misonne, 1969), a suggested alliance supported by shared derived traits of the feet, digits, and skull ( Musser and Newcomb, 1983).

Musser and Newcomb (1983) suggested the evolutionary history of Hapalomys to have been confined to Indochina, a view now confirmed by Pleistocene fossils that document a small radiation in the region probably originating in the Pliocene. Isolated molars from early Pleistocene cave sediments in the Sichuan-Guizhou region of S China have been described as H. eurycidens , H. angustidens , and H. gracilis ; H. khaorupchangi is represented by molars from early and middle Pleistocene cave deposits on peninsular Thailand ( Chaimanee, 1998). A hypothesis of cladistic relationships among three of these extinct and the two living species, based upon molar traits, is provided by Chaimanee (1998).