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Species: Tetramorium pacificum   Mayr, 1870 

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See Also:

Tetramorium pacificum_cf, Tetramorium pacificum subscabrum

Taxonomic History (provided by Barry Bolton, 2015)

Tetramorium pacificum Mayr, 1870b PDF: 976 (w.q.) TONGA. Oceania. AntCat AntWiki

Taxonomic history

Imai, Kubota, et al. 1985: 47 (k.).
Senior synonym of Tetramorium subscabrum: Bolton, 1977 PDF: 102.


Islands of Leyte, Luzon, Mindanao, Negros, Romblon


Introduced species. CA record: Smith (1943).


(Dutch vernacular name: Pacifische zaadmier)

Taxonomic Treatment (provided by Plazi)

Forel, A., 1912:
[[worker]]. Pilam.

Emery, C., 1893:
- Kandy, Colombo.
Le pedicule de l'abdomen est beaucoup moins comprime que chez le type des iles Tonga (exemplaire provenant du Museum Godeffroy) et plus fortement rugueux; la base de l'abdomen est plus fortement striee: toutefois ces caracteres ne sont pas aussi prononces que chez T. scabrum Mayr (1) auquel cette forme fait passage. La couleur est d'un brun fonce ou noire; avec les mandibules, les trochanters, les genoux et les tarses d'un brun clair.
J'ai recu de M. Andre une [[ worker ]] de la Nouvelle-Caledonie qui ressemble beaucoup a celles de Ceylan.

Ward, P. S., 2005:
I [introduced species]

Bolton, B., 1979:
(Fig. 44)
Tetramorium pacificum Mayr , 1870: 972, 976. Syntype workers, female, Tonga: Tongatabu (BMNH; NM, Vienna) [examined]. [For a statement of current synonymy oi pacificum see Bolton, 1977: 102.]
Worker. TL 3.7 - 4.6, HL 0.86 - 1.10, HW 0.72 - 1.02, CI 83 - 90, SL 0.62 - 0.82, SI 79 - 87, PW 0.54 - 0.68, AL 1.04 - 1.30 (45 measured).
Mandibles usually unsculptured except for hair-pits but in some populations with feeble traces of striation. Anterior clypeal margin with a median notch or impression; median portion of clypeus with three strong longitudinal carinae. Frontal carinae long and strongly developed, usually approaching the occipital margin. Maximum diameter of eye c. 0.18 - 0.21, about 0.22 - 0.25 x HW. Propodeal spines long and acute, usually narrow and often somewhat upcurved along their length. Metapleural lobes acute and upcurved, usually broad. Petiole in profile characteristically shaped (Fig. 44), with the posterior face higher than the anterior so that the convex dorsum slopes upwards posteriorly and the posterodorsal angle is higher than the anterodorsal. Anterior face and dorsum confluent through a curve. Sculpture variable in density and intensity. On the head varying from a blanketing rugoreticulum to a system which is predominantly longitudinal but with cross-meshes present from the level of the anterior margins of the eyes; always with a reticulum posteriorly, close to the occiput. Ground-sculpture between rugae superficial but quite conspicuous. Dorsal alitrunk reticulate-rugose; often pedicel segments similarly sculptured but in some the sculpture predominantly longitudinal. First gastral tergite usually with at least traces of basal costulae; although these are often vestigial they are only rarely completely absent. Erect or suberect long hairs numerous on all dorsal surfaces of head and body. Colour a uniform dark brown, blackish brown or black.
T. pacificum ranges throughout the Oriental and Indo-Australian regions and occurs in northern Australia. It is very widespread in most or all of the island-systems of the Pacific (Wilson & Taylor, 1967; Bolton, 1977) and has been recorded from California in the U. S. A. (M. R. Smith, 1943 ; Creighton, 1950). The shape of the petiole in pacificum is unique amongst tetramoriines occurring in the New World and should serve to identify instantly this species.

Specimen Habitat Summary

Found most commonly in these habitats: 74 times found in disturbed forest, 25 times found in rainforest, 67 times found in primary rainforest, 56 times found in secondary forest, 38 times found in coastal forest, 12 times found in forest edge, 8 times found in forest, 13 times found in disturbed rainforest, 6 times found in forest and glacis, 9 times found in mangrove forest, ...

Collected most commonly using these methods or in the following microhabitats: 1 times 2 Maxi Winks, 19 times hand collection, 2 times yellow pan trap, YP 25 trap transect, 3 times search, 1 times hand collection, cookie bait, 3 times aspirating, 1 times aspirating; PB bait, 3 times davis-sifting; incidental aspirated, 2 times aspirating; PB & maple syrup bait, 1 times aspriated, 46 times nw, SBa 226, 12, ...

Elevations: collected from 1 - 2000 meters, 342 meters average

Type specimens: syntype: casent0235203; syntype of Tetramorium pacificum: casent0904848; syntype of Tetramorium pacificum subscabrum: casent0904850

(-1 examples)

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