 Nesomys narindaensis is an extinct rodent that lived in northwestern Madagascar . It is known from subfossil skull bones and isolated molars found in several sites during field work that started in 2001 . First described in 2010 , it is placed in the genus Nesomys together with three smaller living species , which may differ in some details of molar morphology . The presence of N. narindaensis , a rare element in the local rodent fauna , suggests that the region was previously more humid . 
