Amphinectomys Malygin 1994

Amphinectomys Malygin 1994, Zool. Zh., 73: 198.

Type Species: Amphinectomys savamis Malygin 1994

Species and subspecies: 1 species:

Species Amphinectomys savamis Malygin 1994

Discussion: Oryzomyini . A water rat morphologically similar to Nectomys but with more expansive interdigital webbing and broader interorbital region (Malygin et al., 1994). The new genus was differentially diagnosed with respect to nearby populations of Nectomys squamipes sensu Hershkovitz (1944), now well known to be a heterogeneous composite (see below); the relationship and generic status of savamis should be confirmed within a broader sampling of Nectomys species and other oryzomyines. The karyotype (2n = 52; Malygin et al., 1994) fits within the range of variation documented for species of Nectomys (2n = 38-59; e.g., Andrades-Miranda et al., 2001 b), but critical banding comparisons are needed; genetically closely related to Nectomys squamipes based on nuclear gene (IRBP) sequences (Weksler, 2003). Anatomy of male reproductive tract reported by Malygin and Rosmiarek (1997) and compared with other oryzomyines.