Order Rodentia - Family Cricetidae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 955 1189 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Deltamys kempi Thomas 1917 Deltamys kempi Thomas 1917 , Ann. Mag. Nat. Hist., ser. 8, 20: 98 . Type Locality: Argentina , Buenos Aires Prov. , Río Paraná Delta, La Plata Estuary, Isla Ella, 1 m . Vernacular Names: Kemp's Akodont . Synonyms: Deltamys langguthi Massoia 1980 ; Deltamys langguthi González and Massoia 1995 . Distribution: EC Argentina , Uruguay , and SE Brazil ( Rio Grande do Sul —González and Massoia, 1995; also see D’Elía et al., 2003:Fig. 1). Conservation: IUCN – Lower Risk (lc) as Akodon kempi . Discussion: Distribution and ecology reviewed by Massoia (1964); karyotype (2n = 35-38, FN = 38) and unique sex-determining mechanism described by Sbalqueiro et al. (1984) and Castro et al. (1991) . Status of populations exhibiting different karyotypes ( Castro et al., 1991 ) warrants further investigation. See González and Pardiñas (2002, Mammalian Species, 711).