Western lowland olingo
|Western lowland olingo|
|The western lowland olingo sitting on a branch|
| Bassaricyon medius|
Bassariscyon gabbi orinomus Goldman, 1912
The western lowland olingo is smaller than the northern olingo, but larger than the most montane member of the genus, the recently described olinguito ("little olingo"). While the Panamanian subspecies B. m. orinomus is about the same size as the eastern lowland olingo, the subspecies from west of the Andes, B. m. medius is smaller. The pelage is slightly lighter than that of the eastern species.
There are two subspecies of the western lowland olingo: the nominate B. m. medius (Colombia and Ecuador) and B. m. orinomus (Panama and possibly Colombia). The closest relative of the western lowland olingo is the other lowland olingo species, B. alleni, found east of the Andes, from which it diverged about 1.3 million years ago.