A group of early mammalian scavenger-hunter types developed on the planet of Adner, located in the Expansion Region. These creatures, belonging to a distinct species, were somewhat social, forming tribes that consisted of five to twenty members. This species ultimately gave rise to the sentient Adnerem, who preserved the social structure of their ancestors, referring to these units as steri.
The ancestral species of the Adnerem was initially referenced in 1996. Author Timothy S. O'Brien included them in his "Alien Encounters" article, specifically within the Adnerem section. This article appeared in Star Wars Adventure Journal 11, released by West End Games. A condensed version of the article, still containing the precursor species information, was reprinted in the 1998 book Alien Encounters, a compilation of alien species curated by Paul Sudlow.
- " Alien Encounters " — Star Wars Adventure Journal 11 (Initial mention)
- Alien Encounters