An early Miocene (18-20 mya) distal humerus from Napak, Uganda, is the
only element of the forelimb to be allocated to African Lorisinae. It
s loris-like features distinguish it from other East African material
that more closely resembles galagids. Tracing the evolution of the lor
isoid body has been a difficult task due to the lack of good fossil ma
terial. Here, we add a single specimen to this poor record. This humer
us helps to document the beginning of extant lorisid locomotor special
ization and function.