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Holotype worker. TL 2.8, HL 0.70, HW 0.66, CI 94, SL 0.48, SI 73, PW 0.48, AL 0.78.
Mandibles smooth with scattered pits, without longitudinal striation. Anterior clypeal margin with a median notch or impression. Frontal carinae moderately well developed, extending back almost to the occiput, but becoming confused with the remaining cephalic sculpture before reaching it. Antennal scrobes broad and shallow, without delimited ventral or posterior margins. In full-face view the occipital margin broadly concave, the sides of the head evenly convex and the head narrower in front of the eyes than behind. Dorsal alitrunk in profile evenly convex, the propodeum armed with a pair of straight narrow spines. Metapleural lobes triangular and acute. Node of petiole high and narrow, shaped as in Fig. 7; in dorsal view subglobular, very slightly broader than long. Dorsum of head irregularly longitudinally rugulose, the rugulae fine and widely separated and the interspaces with distinct granular or punctulate ground-sculpture. Dorsal alitrunk covered with irregular fine rugulae which form a disorganized and very broken reticulum, the spaces between them with feeble ground-sculpture which is weaker than on the head. Petiole, postpetiole and gaster unsculptured. Dorsal surfaces of head, alitrunk, petiole and postpetiole with numerous erect fine long hairs and also with scattered pubescence, also erect or suberect. First gastral tergite with abundant subdecumbent pubescence, but without long hairs such as are obvious on the dorsal alitrunk and fringing the remaining gastral segments. Colour orange-brown.
Paratype workers. TL 2.8 - 2.9, HL 0.68 - 0.70, HW 0.62 - 0.66, CI 90 - 94, SL 0.46 - 0.50, SI 73 - 78, PW 0.47 - 0.50, AL 0.70 - 0.78 (11 measured). As holotype.
Holotype worker, Madagascar: La Mandraka, 1280 m, 8. ii. 1977, leaf litter, mont, forest, AB 41 nest in seed capsule in litter (W. L. & D. E. Brown) (MCZ, Cambridge). Paratypes. 16 workers and 1 dealate female, with same data as holotype (MCZ, Cambridge; BMNH).
Among the species of the schaufussi-group which lack long hairs on the first gastral tergite, naganumHNS is unique in having fine long hairs present on the propodeum, petiole and postpetiole. As in cognatumHNS, pubescence on the first gastral tergite is dense and somewhat elevated, not minute, scattered and appressed as in proximumHNS.
Found most commonly in these habitats: 8 times found in montane rainforest, 3 times found in rainforest, 2 times found in montane forest, 1 times found in mont. forest.
Found most commonly in these microhabitats: 8 times sifted litter (leaf mold, rotten wood), 1 times nest in seed capsule, in litter, 2 times sifted litter, 1 times leaf litter.
Collected most commonly using these methods: 5 times MW 50 sample transect, 5m, 2 times 03 MaxiWinks, mixed samples, 1 times MW, 25 sifted litter, 1 times pitfall trap, PF 50 traps, 11 cm dbh with water, soap, formalin, nonlinear placement, 1 times MW 25 sample transect, 5m, 1 times MW 26 sample transect, 5m, 1 times pitfall trap.
Elevations: collected from 154 - 1300 meters, 964 meters average