Mammalia, Didelphimorphia, Didelphidae, Chacodelphys formosa (Shamel, 1930): range extension

Chacodelphys formosa (Shamel, 1930) is possibly the smallest species of the Didelphimorphia (head and body length = 68 mm, tail length = 55 mm; see Voss et al. 2004). Its distribution is only known from five localities in the east of the Chaco and Formosa provinces, Argentina (Teta et al. 2006). These five localities cover an area of about 10,000 km in the South American Humid Chaco eco-region. According to the criteria of the UICN, Teta et al. (2006) suggested that this species must be considered as Vulnerable.