- Holotype: CASC CASENT0152199, worker.
- Paratype: One worker with same data as holotype except sampled from ground and collection code BLF22648 (CASC: CASENT0152192).
- Type locality: MADAGASCAR, Antsiranana, Betaolana Forest, along Bekona River, 14.52996 S, 49.44039 E, 880 m, rainforest, on low vegetation, collection code BLF22647, 5.III.2009 (B.L. Fisher et al.).
- Etymology: The name of the species is composed of “iso”, which is Old Greek meaning “equal”, and “electrum”, which is the species epithet of T. electrum. Tetramorium electrum and T. isoelectrum are very similar, and the species name reflects this.