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

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Diagnostic Images

Headfront - Worker
Caroline Harding MAF
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Diagnostic Images (4)
Diagnostic Notes
Total length 3.7–4.6 mm; entire body uniform dark brown to black; surface sculpture is variable in density and intensity, but most of head and dorsal alitrunk sculptured, while gaster smooth excepting for base of first tergite, which almost always has some striation present at its base, even if very faint; eyes moderate in size; mandibles usually unsculptured; antennae 12-segmented with a 3-segmented antennal club; short antennal scapes that do not surpass the posterior margin of the head; antennal scrobe present; antennal insertion surrounded by a distinct elevated ridge; frontal carinae long and strongly developed, reaching well back beyond eyes and usually approaching occiput. Medial clypeus with 3 strong longitudinal carinae, sometimes with another weak pair; anterior margin with a median notch. Slope of mesosoma even and gradual. Propodeum dorsally with 2 long, acute, narrow and somewhat upcurved spines; additionally a pair of flanges (metapleural lobes) present near the insertion of the petiole, these acute and upcurved, usually broad. 2-segmented waist; wave-shaped petiolar node, with the posterior face longer than the anterior so the convex dorsum slopes upwards posteriorly; in dorsal view the petiole is usually slightly longer than broad; erect or suberect long hairs present on all dorsal surfaces of head and body; first gastral tergite with basal costulae (rounded ridges); sting present, tip with a triangular extension.


- 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: 14 Jan 2009).

- Clouse, R.M. (2007). The ants of Micronesia (Hymenoptera: Formicidae). Micronesica, 39(2): 171-295.
More Information
Specimen Contact
MAF Plant Health & Environment Laboratory
MAF Plant Health & Environment Laboratory
22/11/2011 09:49 AEST
Last Updated
05/05/2014 03:13 AEST
MAF Plant Health & Environment Laboratory (2011) Ant (Tetramorium pacificum) Updated on 5/5/2014 3:13:12 AM Available online: PaDIL -
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