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(Figs 10, 11)
Worker. TL 3.8 - 3.9, HL 0.84 - 0.86, HW 0.78, CI 90 - 93, SL 0.68 - 0.70, SI 87 - 90, PW 0.60, AL 1.00 - 1.02 (2 measured).
Mandible with a few faint and feeble striae but with extensive smooth areas. Clypeus with a sharp, fine median carina. Frontal carinae short, ending just posterior to the level of the eyes. Antennal scrobes very weak, merely short, shallow impressions below the frontal carinae and not as long as the antennal scapes. Pronotal corners rounded in dorsal view, the sides of the pronotum bluntly marginate. Dorsum of mesonotum and propodeum separated from the sides by an acute, very distinct margination which runs to the bases of the long, acute propodeal spines. Dorsal alitrunk between the margination transversely flat, longitudinally feebly convex. Metapleural lobes short and rounded. Petiole in profile anteroposteriorly compressed, the node tapering from base to apex as shown in Fig. 11. Dorsum of head with sparse, scattered, fine longitudinal rugulae which peter out posteriorly. Dorsal alitrunk unsculptured but with superficial patterning, the pedicel and gaster unsculptured. All dorsal surfaces of head and body with erect or suberect fine hairs. Head and alitrunk black or blackish brown, the pedicel and gaster dark brown.
Rendered highly conspicuous among the Malagasy tetramoriines by its lack of sculpture, sharply margined mesonotum and propodeum and compressed petiole, marginatumHNS is unlikely to be confused with any other member of the genus from Madagascar or Africa.
Madagascar: Rte d'Anosibe (W. L. & D. E. Brown); Beforona (A. Peyrieras).
Found most commonly in these habitats: 33 times found in rainforest, 25 times found in montane rainforest, 1 times found in montane forest, 1 times found in transition humid forest, 2 times found in montane rainforest, marsh edge, 1 times found in open area near stream, 1 times found in rainforest, transition to montane forest, 1 times found in stomach contents of Mantella bernhardi, 1 times found in tropical forest, 1 times found in dry forest, ...
Found most commonly in these microhabitats: 21 times sifted litter (leaf mold, rotten wood), 9 times sifted litter, 9 times ex rotten log, 4 times on low vegetation, 1 times in forest along riverbank, 2 times under moss on rotton log, 1 times forest humus & litter, 1 times ex soil.
Collected most commonly using these methods: 3 times 03 MaxiWinks, mixed samples, 8 times MW 25 sample transect, 5m, 2 times 9 MaxiWinks, mixed samples, 4 times Malaise trap, 4 times MW 50 sample transect, 5m, 1 times ex yellow pan trap, 3 times MW, 25 sifted litter, 2 times 9 Maxi winklers, 2 times pitfall trap, PF 25 cup sample transect, 5m, 2 times pitfall trap, PF 50 traps, 11 cm dbh with water, soap, formalin, nonlinear placement, 1 times hand netted, ...
Elevations: collected from 30 - 1343 meters, 959 meters average
Collect Date Range: collected between 1974-09-01 and 2016-03-17