The Species Black List
Mesomys leniceps
woolly-headed spiny tree rat
The woolly-headed spiny tree rat (Mesomys leniceps) is known only from two small areas of montane cloud forest in northwestern Peru (Amazonas department).
Status Data Deficient on the IUCN Red List Restriction tier 2, restricted, extent unclear Class Mammalia Realm Neotropical Locality not specified in the source As IUCN records it Mesomys leniceps Thomas, 1926 This species is one of 3,062 in a list of vertebrates the IUCN Red List records as Data Deficient or has never assessed, ranked by how narrowly restricted the published record says they are. The sentence above is the evidence the tier was read from, quoted from Matthew Richardson, Threatened and Recently Extinct Vertebrates of the World (2023).
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Check this species elsewhere: IUCN Red List · GBIF