<ref name="Brown_1964">{{cite journal |first1=W. L., Jr. |last1=Brown |year=1964 |title=''Rhoptromyrmex opacus'', new synonymy of, and brief characterization |url=https://antcat.org/documents/450/10053.pdf |journal=Pilot Register of Zoology |publisher= |volume=Card |issue= |pages=1–2 |doi= }}</ref>