• Wheeler & Wheeler, 1990b: 764 (l.); Kohout, 2014: 26 (q.)
• Status as species: Wang et al., 2022: 65.
• Senior synonym of Polyrhachis ypsilon synacantha: Hung, 1970: 19.
• Senior synonym of Polyrhachis ypsilon victoris: Hung, 1970: 19.

Junior synonyms

• Polyrhachis ypsilon synacantha Santschi, 1933
• Polyrhachis ypsilon victoris Santschi, 1925

Citations

• Emery, C. 1887a ("1886"). Catalogo delle formiche esistenti nelle collezioni del Museo Civico di Genova. Parte terza. Formiche della regione Indo-Malese e dell'Australia. [part]. Annali del Museo Civico di Storia Naturale 24[=(2)4]:209-240. PDF
• Hung, A. C. F. 1970. A revision of ants of the subgenus Polyrhachis Fr. Smith (Hymenoptera: Formicidae: Formicinae). Oriental Insects 4:1-36. PDF
• Kohout, R. J. 2014. A review of the subgenus Polyrhachis (Polyrhachis) Fr. Smith (Hymenoptera: Formicidae: Formicinae) with keys and description of a new species. Asian Myrmecology 6:1-31. PDF
• Wang, W. Y.; Soh, E. J. Y.; Yong, G. W. J.; Wong, M. K. L.; Guénard, B.; Economo, E. P.; Yamane, S. 2022. Remarkable diversity in a little red dot: a comprehensive checklist of known ant species in Singapore (Hymenoptera: Formicidae) with notes on ecology and taxonomy. Asian Myrmecology 15: e015006:1-152. [online early] 10.20362/am.015006 PDF
• Wheeler, G. C.; Wheeler, J. 1990b. Larvae of the formicine ant genus Polyrhachis. Transactions of the American Entomological Society 116:753-767. PDF