One of two species conquered by the Son'a and absorbed into their society as a labouring class, seen serving aboard Son'a ships and tending their masters in Star Trek: Insurrection.
The Tarlac appear in Star Trek: Insurrection. When Riker and Troi research the Son'a aboard the Enterprise-E, they learn that this small, wealthy people subjugated two less advanced species, the Tarlac and the Ellora, and folded them into Son'a society as servants and workers.
Tarlac are humanoids with rough, heavily textured skin. They are seen throughout Ahdar Ru'afo's flagship in 2375, crewing stations on the bridge and working in the body-shaping facility where the ageing Son'a have their skin stretched and their blood cleansed.
The film says nothing about the Tarlac homeworld or how they were conquered. Their presence chiefly illustrates what the Son'a are: a small band of exiles from the Ba'ku who rely on drugs, surgery and the labour of others, and who are willing to ruin a planet to prolong their own lives.