Most commonly encountered in rainforest, T. metactum is also known from other wet forest habitats. Many collections have been from sweeping vegetation and litter sampling.
Bolton (1980) - Described from a short series intercepted at quarantine in New York, T. metactum is most closely related to Tetramorium youngi from Angola. Details of the separation of the two species are given under T. youngi.
Keys including this Species
Latitudinal Distribution Pattern
Latitudinal Range: -0.317° to -0.317°.
- Source: AntMaps
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
Check data from AntWeb
|Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.|
|Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.|
Images from AntWeb
|Paratype of Tetramorium metactum. Worker. Specimen code casent0901193. Photographer Ryan Perry, uploaded by California Academy of Sciences.||Owned by NHMUK, London, UK.|
The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.
- metactum. Tetramorium metactum Bolton, 1980: 280, figs. 54, 57 (w.) KENYA.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Holotype: TL 4.0, HL 0.86, HW 0.70, CI 81, SL 0.78, SI 111, PW 0.59, AL 1.10. Paratypes (3 measured): TL 3.6-4.1, HL 0.82-0.84, HW 0.66-0.69, CI 80-83, SL 0.74-0.78, SI 111-113, PW 0.52-0.57, AL 1.02-1.08. Maximum diameter of eye 0.19-0.20, about 0.27-0.29 x HW.
Mandibles coarsely longitudinally striate. Anterior clypeal margin entire, without a median notch or impression. Median portion of clypeus with more than three longitudinal carinae or rugulae (5 in holotype, 4-5 in paratypes). Frontal carinae long, reaching back almost to occipital margin, slightly more strongly developed than other cephalic sculpture throughout their length. Antennal scrobes shallow and narrow, feebly developed. Antennal scapes with SI > 100. Maximum diameter of eye 0.20, about 0.28 x HW. Alitrunk in profile with metanotal groove impressed. Propodeal spines very long, narrow and acute apically, slightly downcurved along their length. Metapleural lobes short-triangular, blunted apically, not acute and upcurved. Petiole in profile with an elongate anterior peduncle, the antero- and posterodorsal angles of the node blunt and rounded, the latter more rounded than the former. Dorsal surface of node evenly but shallowly convex. Anterior and dorsal faces of postpetiole node confluent in a single smooth curve, rounding behind into a much more steeply sloping, almost vertical posterior face. In dorsal view the petiole node slightly longer than broad, the postpetiole about as long as broad, but much broader behind than in front. Dorsum of head with 7 (5-7 in paratypes) irregular longitudinal rugulae between the frontal carinae at the level of the eyes. Scattered cross-meshes are present between the rugulae; occipital region with a narrow rugoreticulum. Ground-sculpture of head a weak but fairly conspicuous granulation or punctulation. Dorsal alitrunk irregularly rugose but the rugae predominantly longitudinal on the pronotum. Dorsum and sides of petiole with faint rugular traces. Postpetiole smooth and shining, with the faintest vestige of punctulate sculpture low down on the sides. First gastral tergite smooth and shining. All dorsal surfaces of head and body with numerous standing hairs; the scapes and tibiae with short, fine, decumbent to appressed pubescence. Colour dark brown, the appendages yellow.
Paratypes: As holotype except for variation noted in the description.
Holotype worker, Kenya: (no loc.) on orchids intercepted at New York quarantine, 1.vi.1961 (W. L. Brown) (Museum of Comparative Zoology). Paratypes. 3 workers with same data as holotype (MCZ; The Natural History Museum).
- Bolton, B. 1980. The ant tribe Tetramoriini (Hymenoptera: Formicidae). The genus Tetramorium Mayr in the Ethiopian zoogeographical region. Bulletin of the British Museum (Natural History) Entomology. 40(3):193-384.
- Nsengimana, V., Hagenimana, T., Barakagwira, J., de Dieu Nsenganeza, J., Iradukunda, S. C., Majyambere, M., Kizungu, O. B., Nkundimana, A., Umutoni, D., Fabrice, R., Cyubahiro, B., Kouakou, L. M., Kolo, Y., Anale, J. S., Gómez, K., Dekoninck, W. 2023. Checklist of ant (Hymenoptera: Formicidae) species from Nyungwe Tropical Rain Forest, south-western Rwanda. Journal of East African Natural History 111(2), 69-81 (doi:10.2982/028.111.0203).
References based on Global Ant Biodiversity Informatics
- Ross S. R. P. J., F. Hita Garcia, G. Fischer, and M. K. Peters. 2018. Selective logging intensity in an East African rain forest predicts reductions in ant diversity. Biotropica 1-11.