Holcoponera aterrima

The only Gnamptogenys species from the Fiji Islands.

Identification
Lattke (2004) - Frons mostly smooth medially with piligerous punctae laterally; mesosoma, petiole, and gaster mostly smooth; promesonotal suture reduced or indistinct; metanotal sulcus distinct; metacoxal dorsum unarmed.

Distribution
Endemic to Fiji.

This taxon was described from Fiji.

Biology
Collections were made from a series in a rotten stick in leaf litter and from sifted rainforest leaf litter. Mann (1921) noted: occurs in small colonies beneath stones, not commonly, though widely distributed.

Nomenclature

 *  aterrima. Wheeleripone aterrima Mann, 1921: 411, fig. 2 (w.q.m.) FIJI IS. Combination in Gnamptogenys: Brown, 1958g: 227. See also: Lattke, 2004: 60.

Worker
Lattke (2004) - Metrics (n = 9): HL 0.86-0.92, HW 0.69-0.74, ML 0.38-0.44, SL 0.72-0.79, ED 0.13-0.18, WL 1.03-1.10 mm. CI 0.79-0.84, SI 1.00-1.08, MI 0.54-0.60, OI 0.18-0.22. Head oval in frontal view, wider posterad than anterad, posterior margin with brief median concavity; anterior clypeal margin convex; frons mostly smooth medially, laterally with rows of piligerous punctae, occipital lobe absent; dorsal lobe of torulus not covered by frontal lobe; scape gradually widened apically, slightly arched basally, dorsum punctate with decumbent pilosity, scape surpassing posterior cephalic margin by at least two apical widths; first funicular segment slightly longer than wide. Clypeus with shallow posteromedian longitudinal sulcus, mostly smooth medially, laterally longitudinally strigulose, brief strigulae present along anterior margin, spilling onto lamella, lamella with small median lobe. Mandibular dorsum smooth with shallow piligerous punctae, masticatory border bluntly denticulate. Dorsal cephalic margin posteriorly evenly convex until anterior margin of frontal lobes in lateral view. Clypeus divided into convex posterior region and anterior sharply inclined margin in lateral view; ommatidia large. Ventral cephalic sculpturing foveolate-rugulose.

Mesosomal dorsal margin evenly convex in lateral view; pronotum anteroventrally angulose, ventral sulcus present; promesonotal suture obsolescent; mesosoma mostly smooth laterally, with sparse punctae and low rugulae; mesosomal dorsum mostly smooth with lateral punctae; metanotal sulcus distinctly impressed as series of contiguous depressions, wider than promesonotal suture. Anepisternum mostly indistinct, sometimes delimited posteriorly by series of brief longitudinal impressions; strigulae present on posteroventral metapleuron; propodeal declivity broadly concave in lateral view, propodeal spiracle separated from declivity by less than one spiracular diameter, propodeal declivity glabrous. Petiole compressed in lateral view, dorsal margin shorter than anterior margin, spiracle situated below anterolateral process, anterior ridge present; postpetiolar process V-shaped in anterior view, with two lateral lobes; gaster mostly smooth with sparse punctae on postpetiole and punctulae on fourth abdominal segment. Fore coxa mostly smooth, some transverse strigulae present along posteroapical region; basal fore tarsal segment with a series of stout setae opposite strigil, dorsally smooth with punctulae; apex of second fore tarsal segment with 4 stout setae; fore tarsal segments 2-4 slightly longer than wide; metacoxal dorsum unarmed. Dorsum of thorax and abdominal segments 1-4 with scattered erect to subdecumbent hairs. Head, mesosoma, gaster brown; mandibles, antennae, legs ferruginous brown.

Queen
Lattke (2004) - Metrics (n = 1): HL 0.90, HW 0.76, ML 0.39, SL 0.79, ED 0.18, WL 1.18 mm. CI 0.85, SI 1.04, MI 0.51, OI 0.24. As worker, except for clearly defined anepisternum, with small elongate region of longitudinal parallel carinulae just below tegula; katepisternum with some transverse-oblique strigulae along posterior margin. Nota and dorsal propodeal surface smooth, with sparse punctulae laterally; declivity glabrous.

Male
Length 2.5 mm.

Head, excluding eyes, distinctly longer than broad, rather broadly rounded behind. Eyes convex, less than half as long as sides of head, situated a little in front of middle. Ocelli large. Mandibles very well developed, similar in shape to those of worker. Clypeus flattened at middle, broadly rounded at anterior border. Frontal carinae short and curved. Antennae 14-jointed, slender, their scapes extending a little beyond posterior borders of eyes, 1st funicular joint rounded, a little shorter than the second, remaining joints cylindrical, the second twice as long as broad, the others increasing in length toward the apex, terminal joint tapering, as long as the two preceding joints and about five times as long as broad. Thorax robust, broadest in front of wing insertions. Mesothorax with strong Mayrian furrows, margined along apical half of border. Scutellum convex, broader than long. Base of epinotum feebly rounded, about half as long as the flat declivous portion. Petiole. in profile longer than deep, narrowed and evenly convex above; from above, a little longer than broad and slightly narrowed in front. Gaster slender. Genitalia prominent; penicelli large, stipites elongate and coarsely ciliate apically.

Shining. Head rugosely punctate, the remainder with scattered irregular punctation.

Pilosity similar to worker.

Reddish brown throughout. Wings hyaline, veins and stigma brown.

Lattke (2004) - Metrics (n = 1): HL 0.67, HW 0.59, ML 0.33, SL 0.36, ED 0.29, WL 1.14 mm. CI 0.88, SI 0.61, MI 0.567, OI 0.49.

Type Material
M.C.Z. 8,685

Lattke (2004) - Syntype workers, queen, male: Fiji, Viti Levu, Waiyanitu (Mann) [Examined].

Additional References

 * [[Media:Mann 1921.pdf|Mann, W. M. 1921. The ants of the Fiji Islands. Bull. Mus. Comp. Zool. 64: 401-499 PDF]]