Didelphidae Author Astúa, D. text 2015 2015-06-30 Lynx Edicions Barcelona Editor Russel A. Mittermeier Editor Don E. Wilson Handbook of the Mammals of the World – Volume 5 Monotremes and Marsupials 129 186 book chapter 10.5281/zenodo.6685333 b488d6b0-2108-4c9b-ba79-458efc034cf9 978-84-96553-99-6 6685333 69. Unduavi Mouse Opossum Cryptonanus unduaviensis French: Opossum de | 'Unduavi / German: Unduavi-Zwergbeutelratte / Spanish: Marmosa gracil de Unduavi Other common names: Unduave Mouse Opossum Taxonomy. Marmosa unduaviensis Tate, 1931 , “ Pitiguaya , Rio Unduavi , Yungas ,” [ La Paz , Bolivia . This species is monotypic. Distribution. N & E Bolivia (Pando, La Paz, Beni, Santa Cruz), recently found in N Paraguay (Estancia Dona Julia, Alto Paraguay). Descriptive notes. Head-body 8-6— 12-1 cm, tail 11.2-13.5 cm; weight 15-40 g. Dorsal fur of the Unduavi Mouse Opossum is dull grayish-brown to reddish, darker along midline and paler on body sides. Face is slightly paler, with narrow eye-rings contrasting with cheeks and crown. Tail length is ¢.120% of head-body length, and tail is fuscous brown. Ventral fur is whitish or orangish, with a narrow line of whitish fur in middle of chest. Fur is long and lax. Feet are small, and carpal tubercles are present in old males. Ears are small and fuscous brown. Female Unduavi Mouse Opossums lack pouches, but number of mammae is unknown. Habitat. Seasonally flooded grasslands, marshy areas, and inside buildings. Food and Feeding. There is no information available for this species. Breeding. There is no information available for this species. Activity patterns. There is no information available for this species. Movements, Home range and Social organization. There is no information available for this species. Status and Conservation. Classified as Data Deficient on The IUCN Red List. The Unduavi Mouse Opossum is very poorly known, with little information available on its distribution, ecological requirements, and population size. Bibliography. Gardner (2005, 2007c), Martinelli et al. (2011), de la Sancha & D’Elia (2014), Tate (1931, 1933), Voss et al. (2005).