According to a checklist of known ant species in Singapore published in 2022, a total of 409 species and subspecies from 10 subfamilies and 100 genera have been documented [1]. A survey conducted in 2012 identified 18 ant species around healthcare facilities in Singapore [2]. In the Southeast Asia region, Thailand reported 247 known ant species in a publication from 2005 [3].

References:

[1] Wang WY, Soh EJY, Yong GWJ Wong MKL, Guénard B, Economo EP, Yamane S. 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;2022:e015006. | Read article |

[2] Man LS, Lee CY. Structure-invading pest ants in healthcare facilities in Singapore. Sociobiology 2012;59(1):241-249. | Read article |

[3] Jaitrong W, Nabhitabhata J. A list of known ant species of Thailand (Formicidae: Hymenoptera). Thai Nat Hist Museum J 2005;1(1):9-54. | Read article |

Online resources on ants in Southest Asia: | Formicidae Checklist: Ants | Ants Community Singapore | Malaysian Formic Lover's | Ants and termites of Malaysia |