Tetramorium sculptatum

Specimen records note litter sample collections from a mossy rainforest and Araucaria forest.

Identification
Bolton (1977) - The very distinctive cephalic sculpture and lack of antennal scrobes distinguish this species from others of the group.

Distribution based on Regional Taxon Lists
Indo-Australian Region: New Guinea.

Nomenclature

 *  sculptatum. Tetramorium sculptatum Bolton, 1977: 109, fig. 26 (w.) NEW GUINEA.

Worker
Holotype. TL 4.1, HL 1.00, HW 0.90, CI 90, SL 0.76, SI 84, PW 0.68, AL 1.20.

Mandibles striate; anterior clypeal margin entire and weakly convex. Frontal carinae short, ending at the level of the posterior margins of the eyes, not more strongly developed than the surrounding longitudinal sculpture and quite inconspicuous. Antennal scrobes absent. Maximum diameter of eyes c. 0'18. Propodeal spines long and acute, feebly downcurved along their length. On the holotype the right hand spine more strongly curved than the left; in some paratypes the spines are very weakly sinuate. Metapleural lobes elongate and acute. Petiole in profile with a long peduncle; node shape showing considerable variation in type-series due to the variable obliteration of the anterodorsal angle. The limits of this variation as shown in the type-series are given in Fig. 26. Clypeus with seven carinae in holotype (in paratype series varying from 5-7, one pair of carinae being variably developed). Dorsum of head very coarsely, regularly and densely longitudinally carinate-rugose or appearing sulcate, with about 12 longitudinal components between the frontal carinae at the level of the eyes. Behind the level of the eyes the sculpture diverges strongly and runs off the dorsum of the head and down the sides, intersecting the lateral outline of the head (full-face view) in the posterior two-thirds or so of the sides behind the eyes. Dorsal alitrunk coarsely reticulate-rugose or reticulate-foveolate, the raised portions rounded and the reticulum itself very irregular. In some para types this sculpture is reduced and in one or two is almost effaced so that the surface is almost smooth but with irregular rounded elongate prominences. Petiole and postpetiole rugose, the dorsum of the postpetiole less strongly so than the sides. Gaster unsculptured. All dorsal surfaces of head and body with numerous fine hairs, those on the dorsal (outer) surface of the hind tibiae very short, much less than the maximum tibial width. Colour very dark blackish brown to black, the appendages somewhat lighter.

Paratype. As holotype and with the variation mentioned above, but also in many the frontal carinae confluent with one component of the longitudinal sculpture on the dorsum of the head. Size range TL 3.8-4.4, HL 0.90-1.06, HW 0.84-0.96, CI 88-93, SL 0.70-0.82, SI 80-87, PW 0.62-0.74, AL 1.10-1.34.

Maximum diameter of eye 0.14-0.18 (21 measured).

Type Material
Holotype worker, New Guinea: Papua, Wau, l.vii.1974, 4000 ft, for. litter (S. Peck). Paratypes. New Guinea: 8 workers with same data as holotype; 13 workers, Papua, Mt Hagen area, 5.vii.1974, c. 2000 m, no. B-280 (S. Peck) (MCZC; ; ; ).