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Scientific Name
Tetramorium tonganum
Scientific Author
Mayr, 1870
(Hymenoptera: Formicidae: Myrmicinae: Tetramoriini)
Pest Status
0 Unknown
NZ - Exotic

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Diagnostic Images

Thorax Lateral - Worker
Caroline Harding MAF
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Diagnostic Images (6)
Diagnostic Notes
Total length 2.6-3.1 mm. Body color yellow to yellowish brown from head to postpetiole; gaster dark brown. Surface sculpture: dorsal head and alitrunk mostly sculptured; spaces between rugulose sculpture on entire dorsum of head smooth or with superficial sculpture, so the surface appears mostly or entirely shiny. Petiole and postpetiole predominantly smooth; gaster smooth. Antennae 12-segmented with a 3-segmented club; short antennal scapes that do not surpass the posterior margin of the head; antennal scrobe present and relatively strong; antennal insertion surrounded by a distinct elevated ridge; eyes moderate in size. Mandibles broad, triangular, striate; with 2 or 3 enlarged apical teeth followed by a row of smaller ones. Frontal carinae not strongly developed but more conspicuous than any other cephalic sculpture; extending back well beyond level of eyes, approaching occiput. Anterior margin of clypeus without median notch; metanotal groove not impressed; propodeum dorsally with 2 short, upturned spines, additionally a pair of flanges (metapleural lobes) present near the insertion of the petiole; two nodes (petiole and postpetiole) present; rounded shape petiole node; petiole with relatively long & thin peduncle; all dorsal surfaces with numerous fine hairs of variable lengths and only scapes and hind tibiae without erect setae; sting present, tip with a triangular extension projecting upwards from the shaft (visible only when sting is extended).


- Sarnat, E.M. (2008). PIA key: Identification guide to invasive ants of the Pacific Islands, Edition 2.0, Lucid v. 3.4. USDA/APHIS/PPQ Center for Plant Health Science and Technology and University of California - Davis. Available online: (Date of access: 15 Jan 2009).

- Clouse, R.M. (2007). The ants of Micronesia (Hymenoptera: Formicidae). Micronesica, 39(2): 171-295.

- Japanese Ant Image Database. (2003). Available online: (Date of access: 15 Jan 2009).
More Information
Specimen Contact
MAF Plant Health & Environment Laboratory
MAF Plant Health & Environment Laboratory
22/11/2011 10:09 AEST
Last Updated
05/05/2014 03:18 AEST
MAF Plant Health & Environment Laboratory (2011) Ant (Tetramorium tonganum) Updated on 5/5/2014 3:18:47 AM Available online: PaDIL -
Image Use
Free for use under the Creative Commons Attribution 3.0 Australia License