- "I've located a vault, and I think I'm going to get proof of a previous civilization there, a precursor race… something."
- ―Chelli Lona Aphra
A percursor species (also precursor race) was a species that eventually evolved into another or several other species. In some cases, the passage from a precursor to its descendants was accompanied by the development of sentience (as exemplified by the sentient Dowutins, whose precursors were herd animals). In other cases, a species that was already sentient to begin with could give rise to several distinct sentient lifeforms (as exemplified by the Pau'ans and Utai, who shared a sentient ancestor).
- Doctor Aphra 1: Aphra, Part I (Mentioned only)
- Star Wars: Aliens of the Galaxy (First mentioned)