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Tetramorium coillumHNS sp. n.
Holotype worker. TL 2.8, HL 0.72, HW 0.67, CI 93, SL 0.46, SI 69, PW 0.48, AL 0.78.
Mandibles coarsely longitudinally striate, anterior clypeal margin with a distinct notch or impression. Maximum diameter of eye 0.12, about 0.18 x HW. Frontal carinae strong to behind level of eyes, but fading out before they reach the occipital area and becoming confused with the remaining sculpture. Antennal scrobes very feeble, all of the scrobal area sculptured. Propodeal spines strong, feebly upcurved along their length, metapleural lobes triangular and acute. Petiole in profile strongly nodiform, with a sharp anterodorsal angle and with a minute peak at the angle due to the presence of a transverse dorsal carina. Posterodorsal angle of petiole rounded. Node of petiole in dorsal view as broad as long. Dorsum of head finely and irregularly longitudinally rugulose, with a conspicuous punctulate ground-sculpture between them, the rugulae forming a weak reticulum occipitally. Dorsal alitrunk reticulate-rugulose, the sculpture more strongly developed than on the head, the individual rugulae low and rounded, with a beaded appearance dorsally due to the presence of fine aligned punctulation. Spaces between reticular meshes mostly smooth. Petiole dorsum finely and densely rugulose, the postpetiolar dorsum with extensive shining areas but with some rugulae present, especially posterolaterally. Gaster unsculptured. Short, fine acute hairs present on all dorsal surfaces of head and body. Colour dark brown.
Paratype workers. As holotype, TL 2.7 - 2.8, HL 0.66 - 0.72, HW 0.62 - 0.66, CI 91 - 94, SL 0.44 - 0.47, SI 69 - 72, PW 0.45 - 0.47, AL 0.72 - 0.78. Maximum diameter of eye 0.11 - 0.12, about 0.17 - 0.19 x HW.
Holotype worker, Madagascar: Bemanevika, Souspref. de Bealanana, 20. x. 1975, forest humus and litter, AB 46 (A. Peyrieras) (MCZ, Cambridge). Paratypes. 12 workers and 2 dealate females with same data as holotype (MCZ, Cambridge; BMNH).
This small species is closest related to ranarumHNS and quasirumHNS but differs from both of these by retaining rugular sculpture on the postpetiole and by having the anterodorsal angle of the petiole node sharp.
Found most commonly in these habitats: 30 times found in montane rainforest, 5 times found in Uapaca woodland, 6 times found in disturbed montane rainforest, 5 times found in savannah grassland, 3 times found in rainforest, 1 times found in transition humid forest, 2 times found in disturbed gallery montane forest, 2 times found in gallery forest, 2 times found in grassland, 1 times found in montane forest, ...
Found most commonly in these microhabitats: 25 times sifted litter (leaf mold, rotten wood), 7 times ex rotten log, 2 times under stone, 6 times sifted litter, 3 times ground forager(s), 2 times forest humus & litter, 3 times under moss on stone, 1 times on low vegetation, 1 times ground nest, 2 times ex soil, 1 times ex root mat, ground layer, ...
Collected most commonly using these methods: 10 times MW 50 sample transect, 5m, 8 times MW 20 sample transect, 10m, 1 times MW 75 sample transect, 5,10m, 1 times 10 Maxiwinks, 2 times MW 25 sample transect, 5m, 1 times 9 MaxiWinks, mixed samples, 3 times pitfall trap, PF 50 traps, 11 cm dbh with water, soap, formalin, nonlinear placement, 2 times pitfall trap, PF 50 tube sample transect, 5m, 1 times MW 26 sample transect, 5m, 2 times pitfall trap, PF 50 cup sample transect, 5m, 2 times SD 20 digging sample transect, 10m, ...
Elevations: collected from 725 - 1987 meters, 1362 meters average
Collect Date Range: collected between 1975-10-20 00:00:00.0 and 2017-01-12 00:00:00.0
Type specimens: Holotype of Tetramorium coillum: casent0280586; paratype of Tetramorium coillum: casent0235219