Pheidole singaporensis valid
Özdikmen, H. 2010b. New names for the preoccupied specific and subspecific epithets in the genus Pheidole Westwood, 1839 (Hymenoptera: Formicidae). Munis Entomology and Zoology 5 (2):804-806.   132772

Pheidole singaporensis conicollis valid Indonesia (Sumatra). Indomalaya.
Emery, C. 1900. Formiche raccolte da Elio Modigliani in Sumatra, Engano e Mentawei. Dummy reference. Annali del Museo Civico di Storia Naturale 40[=(2)20]:661-722.   133004

Pheidole singaporensis continentis unresolved junior homonym Myanmar. Indomalaya.
Forel, A. 1911a. Fourmis de Bornéo, Singapore, Ceylan, etc. récoltées par MM. Haviland, Green, Winkler, Will, Hose, Roepke et Waldo. Revue Suisse de Zoologie 19:23-62.   125209

Pheidole singaporensis pseudola valid Indonesia (Sumatra). Indomalaya.
Forel, A. 1915a. Fauna Simalurensis. Hymenoptera Aculeata, Fam. Formicidae. Tijdschrift voor Entomologie 58:22-43.   125257