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Worker. TL 4.3 - 4.8, HL 1.04 - 1.08, HW 0.92 - 0.96, CI 87 - 90, SL 0.80 - 0.84, SI 86 - 89, PW 0.70 - 0.72, AL 1.30 - 1.34 (6 measured).
Mandibles striate; median clypeal carina acute. Frontal carinae long and strong, diverging towards the occipital corners behind the level of the eyes but merging into the sculpture before reaching the occipital margin. Antennal scrobes a groove capable of containing the scape. Metanotal groove absent, not impressed in profile. Propodeal spines long and acute, the metapleural lobes short and triangular. Petiole node in profile longer than high, flat-topped or feebly convex dorsally, in dorsal view as long as or longer than broad. Dorsum of head regularly longitudinally rugose; dorsal alitrunk similarly sculptured but with some reticulation towards the sides on the pronotum. Petiole and postpetiole with rugose sculpture which is predominantly longitudinal. Gaster unsculptured except for pits from which hairs arise; these are more conspicuous in some specimens than in others. Dorsal surfaces of head and body all with numerous long, fine, erect to suberect hairs. Leading edges of antennal scape with suberect short, curved hairs. Colour light red-brown.
Of the tortuosum-group species on Madagascar andreiHNS is most closely related to robustiorHNS, originally described as an infraspecific variant of andreiHNS, and rather more distantly to latreilleiHNS and kelleriHNS. Differences from robustiorHNS are listed under that species. T. andreiHNS is distinguished easily from latreilleiHNS as the latter lacks hairs on the first gastral tergite and does not have standing hairs on the antennal scapes. T. kelleriHNS, on the other hand, has abundant long hairs, the longest on the scapes being much greater than the maximum scapai width. Also, the node shape of the petiole is radically different, compare Figs 13 and 14.
Madagascar: no loc. (Staudinger); no loc. (ex coll. Mayr); Ampasimbe, prov. Tamatave (J. M. Betsch).
Found most commonly in these habitats: 77 times found in rainforest, 41 times found in montane rainforest, 10 times found in rainforest, transition to montane forest, 4 times found in littoral rainforest, 1 times found in littoral forest, 5 times found in montane forest, 3 times found in transition humid forest, 1 times found in montane rainforest, marsh edge.
Found most commonly in these microhabitats: 43 times sifted litter (leaf mold, rotten wood), 47 times ex rotten log, 7 times sifted litter, 4 times ground forager(s), 4 times ex rotten stick on ground, 1 times ex root mat, ground layer, 1 times ex dead tree stump, 1 times under rootmat, litter on rock, 1 times under moss on live tree, 1 times ground nest, 2 times ex soil, ...
Collected most commonly using these methods: 15 times MW 50 sample transect, 5m, 7 times MW 25 sample transect, 5m, 4 times 10 MaxiWinks, mixed samples, 6 times 9 MaxiWinks, mixed samples, 5 times 03 MaxiWinks, mixed samples, 1 times 7 MaxiWinks, 6 times pitfall trap, PF 50 tube sample transect, 5m, 2 times 10 maxi winks, 2 times 9 Maxi winklers, 3 times MW 75 sample transect, 5,10m, 1 times MW, 10 sifted litter, ...
Elevations: collected from 10 - 1625 meters, 726 meters average
Type specimens: Lectotype of Tetramorium andrei: casent0101821; paralectotype of Tetramorium andrei: casent0101281, casent0101282; syntype of the synonym Tetramorium robustior: casent0101279, casent0101280