Belongs within: Formicidae.
The Proceratiinae are a group of small ants characterised by fully or nearly fully exposed antennal sockets close to the anterior margin of the head, together with a single petiolar segment and a fused promesonotal suture. Members of the tribe Proceratiini also have the fourth abdominal tergite much enlarged and strongly arched (Heterick 2009).
<==Proceratiinae
|--Probolomyrmex Mayr 1901TB85 [ProbolomyrmeciniH09]
| | i. s.: *P. filiformis Mayr 1901TB85
| | P. bidensSGH12
| | P. maryatiaeSGH12
| | P. okinawensis Terayama & Ogata 1988I92
| | P. taniRBV08
| | P. vietiSGH12
| |--P. greavesi groupSGH12
| | |--P. greavesi Taylor 1965TB85
| | |--P. latalongus Shattuck, Gunawardene & Heterick 2012SGH12
| | `--P. salomonisSGH12
| `--P. longinodus groupSGH12
| |--P. aliundus Shattuck, Gunawardene & Heterick 2012SGH12
| |--P. longinodus Terayama & Ogata 1988I92
| |--P. newguinensis Shattuck, Gunawardene & Heterick 2012SGH12
| `--P. simplex Shattuck, Gunawardene & Heterick 2012SGH12
`--ProceratiiniH09
|--Proceratium Roger 1863TB85
| |--*P. silaceum Roger 1863TB85
| |--P. californicumWW90
| |--P. papuanum Emery 1897TB85
| `--P. stictum Brown 1958TB85
`--Discothyrea Roger 1863H09, KT99 (see below for synonymy)
|--*D. testacea Roger 1863KT99
|--D. bidens Clark 1928TB85
|--D. crassicornis Clark 1926TB85
|--D. kamiteta Kubota & Terayama 1999KT99
|--D. leae Clark 1934TB85
|--‘*Pseudosysphincta’ poweri Arnold 1916KT99
|--D. sauteriKT99
|--D. turtoni Clark 1934TB85
`--D. velutina (Wheeler 1916)TB85 [=*Prodiscothyrea velutinaKT99]
Discothyrea Roger 1863H09, KT99 [incl. Prodiscothyrea Wheeler 1916KT99, Pseudosysphincta Arnold 1916KT99, Pseudosphincta (l. c.)KT99]
*Type species of generic name indicated
References
[H09] Heterick, B. E. 2009. A guide to the ants of south-western Australia. Records of the Western Australian Museum Supplement 76: 1–206.
[I92] Iwahashi, J. (ed.) 1992. Reddo Deeta Animaruzu: a pictorial of Japanese fauna facing extinction. JICC: Tokyo.
[KT99] Kubota, M., & M. Terayama. 1999. A description of a new species of the genus Discothyrea Roger from the Ryukyus, Japan (Hymenoptera: Formicidae). Memoirs of the Myrmecological Society of Japan 1: 1–5.
[RBV08] Rabeling, C., J. M. Brown & M. Verhaagh. 2008. Newly discovered sister lineage sheds light on early ant evolution. Proceedings of the National Academy of Sciences of the USA 105 (39): 14913–14917.
[SGH12] Shattuck, S. O., N. R. Gunawardene & B. Heterick. 2012. A revision of the ant genus Probolomyrmex (Hymenoptera: Formicidae: Proceratiinae) in Australia and Melanesia. Zootaxa 3444: 40–50.
[TB85] Taylor, R. W., & D. R. Brown. 1985. Formicoidea. In: Walton, D. W. (ed.) Zoological Catalogue of Australia vol. 2. Hymenoptera: Formicoidea, Vespoidea and Sphecoidea pp. 1–149. Australian Government Publishing Service: Canberra.
[WW90] Wheeler, G. C., & J. Wheeler. 1990. Insecta: Hymenoptera Formicidae. In: Dindal, D. L. (ed.) Soil Biology Guide pp. 1277–1294. John Wiley & Sones: New York.