Leptomys signatus Tate and Archbold 1938

Leptomys signatus Tate and Archbold 1938, Am. Mus . Novit., 982: 2.

Type Locality: Papua New Guinea, Western Province, Sturt Isl Camp, Fly River (north bank), near sea level, 08°15'S, 142°15'E.

Vernacular Names: Fly River Leptomys.

Distribution: Known only from the type locality along lower Fly River; limits unknown.

Conservation: IUCN – Critically Endangered.

Discussion: The diagnostic traits Tate and Archbold (1938) used to separate this species from the other two (short, dense fur and gray upperparts with a white blaze on forehead) identify a lowland population of Leptomys that shows no morphological intergradation with samples of the other three species of Leptomys (Musser and Lunde, ms). Leptomys signatus is still known only by the four examples in the type series.