The Species Black List
Petaurillus hosei
Hose's pygmy flying squirrel
Hose's pygmy flying squirrel (Petaurillus hosei) is known only from a few specimens collected over a small area of northern Borneo (Sabah and Sarawak, Malaysia and Brunei).
Status Data Deficient on the IUCN Red List Restriction tier 2, restricted, extent unclear Class Mammalia Realm Indo-Malaysian Locality not specified in the source As IUCN records it Petaurillus hosei (Thomas, 1900) 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