Terrellian
Terrellians might refer to:

 Terrellian (Alpha Quadrant), the species found in the Alpha Quadrant
 Unnamed Terrellians (Alpha Quadrant), unnamed members of an Alpha Quadrant species
 Terrellian (Delta Quadrant), the species found in the Delta Quadrant
 Unnamed Terrellians (Delta Quadrant), unnamed members of a Delta Quadrant species

You might also be looking for: 
 Terellian, a four-armed race native to the Alpha and Beta Quadrants
 Terrelian, a race visiting Deep Space 9 in 2371
 Unnamed Terrelians, unnamed members of said race
 Tarellian, a humanoid species that suffered a dreadful plague
 Unnamed Tarellians, unnamed members of said race
 Tyrellian, a species known for its laser art