| Gnamptogenys rugodens|
The type, a worker, was collected from the edge of primary forest.
Lattke (2004) - The deeply rugose mandibles in G. rugodens are quite distinctive and find no parallel in any other species of Gnamptogenys, with the possible exception of Gnamptogenys lacunosa, which has a considerably rugose mandibular base, but the rugae are not as deep as in G. rugodens. G. lacunosa has a less prominent occipital lamella, the clypeal lamella has some minute sculpturing but not as finely scabrose, and its anterior margin is more convex; it is a smaller ant (HW < 0.75 mm), with relatively larger eyes (OI > 0.25) and narrower head (CI < 0.80). Gnamptogenys polytreta has prominent occipital lamella, as in G. rugodens, but differs in the more broadly convex dorsal margin of the petiolar node, a triangular subpetiolar process, and a relatively longer declivitous propodeal margin compared with its dorsal margin. It is also smaller bodied (HL < 0.85; HW < 0.65; WL < 1.25 mm) than G. rugodens.
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
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Not much is known about the the biology of Gnamptogenys rugodens. We can speculate that the biology of this species is similar to other species of the genus. Gnamptogenys are predatory ponerine ants that inhabit tropical and subtropical mesic forests. Nesting is typically at ground level in rotten wood or leaf litter. Some exceptions include species that are arboreal, a dry forest species and species that nests in sandy savannahs. Colony size tends to be, at most, in the hundreds. Queens are the reproductives in most species. Worker reproduction is known from a few species in Southeastern Asia. Generalist predation is the primary foraging/dietary strategy. Specialization on specific groups (millipedes, beetles, other ants) has developed in a few species.
The queen and male are unknown.
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- rugodens. Gnamptogenys rugodens Lattke, 2004: 214, fig. 60 (w.) BORNEO.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Frontal lobe followed posteriorly by smaller convexity formed by frontal carina; each lateral cephalic margin just posterad of mandible forms small concavity followed by small triangular projection; mandibles deeply rugose, especially toward base. Propodeal declivitous margin very short compared with dorsal margin in lateral view.
Metrics. Holotype: HL 0.94, HW 0.78, ML 0.42, SL 0.68, ED 0.18, WL 1.37 mm. CI 0.82, SI 0.87, MI 0.55, OI 0.23. Each lateral cephalic margin posterad of eye fairly straight in frontal view; briefly concave just anterad of eye, then mostly straight to broadly convex, followed by small triangular process; clypeal lamella laterally rounded and anteriorly straight, translucent, with reticulate etchings; frontal lobe convex followed posterad by smaller convexity formed by frontal carina; clypeus longitudinally strigulose posterad, sculpturing fading away anterad; mandibles edentate, deeply rugose basally; mandibular dorsal margin undulated basally in lateral view; occipital lamella medially straight, convex at both ends.
Pronotum laterally foveolate, foveolate-strigose posterad, smooth along ventral margin, anteroventrally bluntly angular; anepisternum undulate with punctae; katepisternum strigulose with irregular depressions along posterior margin, anterad smooth; metapleuron smooth, separated from propodeum by row of elongate foveolae that curve just below spiracle; propodeum with scattered foveolae; mesosoma with well developed humeral angle in lateral view. Petiolar node dorsum mostly smooth, sparsely foveolate, laterally densely foveolate, ventral process subquadrate; postpetiole laterally with deep anterior scalloping, slightly shallower posterad; postpetiolar sternite mostly smooth with shallow lateral foveolae, posterior margin with row of punctae; postpetiolar dorsum mostly smooth with sparse scalloped punctae, deeper anterad than posterad; fore coxa transversely strigose, smooth anterad. Dorsum of thorax and abdominal segments 1-4 with scattered erect to subdecumbent hairs. Body brown; mandibles, scapes, legs ferruginous brown.
Holotype worker. Malaysia, Sarawak, Gunung Penrissen, 1000m, 23-v-1994, I. Löbl & D. Burckhardt legs, edge of primary forest #9a. Deposited in Musee d'Histoire Naturelle Genève.
The species name is a compound epithet derived from the Latin words for “fold,” ruga (f.), and ‘tooth,” dens (m.) that alludes to the deep mandibular rugosities.
- Lattke, J. E. 2004. A Taxonomic Revision and Phylogenetic Analysis of the Ant Genus Gnamptogenys Roger in Southeast Asia and Australasia (Hymenoptera: Formicidae: Ponerinae). University of California Publications in Entomology 122: 1-266 (page 214, fig. 60 worker described)