Specimens of G. macretes have been found in rotten logs in rainforest.
Lattke (2004) - This species seems to be a sister species of Gnamptogenys niuguinensis based on several synapomorphies such as lack of an occipital lobe and shared trends of surface sculpture. G. macretes differs from G. niuguinensis in the following characters: clypeal lamella protruding less, scape mostly smooth, occipital lamella convex, tibiae longitudinally strigulose punctate, femora and tibiae smooth, meso- and metafemora with convex apical paired lobes, fore tarsus opposite strigil with a single stout seta.
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 macretes. 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 following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- macretes. Gnamptogenys macretes Brown, 1958g: 313 (w.q.m.) NEW GUINEA. See also: Lattke, 2004: 122.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Lattke (2004) - Occipital lobe lacking, occipital lamella prominent and convex. Postpetiolar dorsum striate with scattered piligerous punctae, striae transverse on anterior face curving around medially becoming longitudinal posterad. Dorsum of abdominal segment 4 with narrow anteromedian strip of transverse striae posteriorly bordered by arching low sulcus, with a patch of longitudinal striae extending on anterior one-third to one-half, striae longest medially becoming progressively shorter laterally, rest of tergite mostly smooth with scattered punctures.
Lattke (2004) - Metrics (n = 4): HL 1.20-1.28, HW 1.01-1.10, ML 0.61-0.67, SL 1.09-1.18, ED 0.27-0.31, WL 1.72-1.84 mm. CI 0.82-0.88, SI 1.07-1.10, MI 0.57-0.61, OI 0.27-0.29. Head subquadrate with longitudinal lateral margins in frontal view, posterior margin relatively straight, anterior margin of clypeal lamella ending in median blunt angle; frons with strigae forming posteriorly diverging rows surrounding round to oval smooth-bottomed foveolae, with strigulae between foveolae; clypeus longitudinally strigulose, strigulae partially extending onto lamella. Scape mostly smooth with scattered piligerous punctae; mandibular dorsum mostly longitudinally costulae; occipital lobe lacking, occipital lamella prominent and convex. Lateral pronotal face mostly foveolate, strigulae present posterad, posteromedian corner mostly smooth with some punctae; anepisternum mostly smooth with some foveolaepunctae; katepisternum with abundant round to oval foveolae and scattered low strigulae; metapleuron anterodorsally undulate to vaguely strigulose, posteroventrally longitudinally strigulose; promesonotum densely foveolate in dorsal view, foveolae forming approximate concentric circles around median patch of longitudinal strigulae; promesonotal suture vaguely impressed; propodeum densely foveolate to areolate, declivity mostly smooth.
Petiolar node with shorter posterior margin than anterior margin in lateral view, dorsum with low transverse strigulae and scattered foveolae; ventral process forming anteriorly projecting narrow lobe; postpetiolar dorsum striate with scattered piligerous punctae, striae on anterior face transverse, curving around medially and becoming longitudinal posterad; postpetiole laterally with anterior one-third transversely strigulose, dorsal half longitudinally strigulose, posteroventral corner mostly smooth; postpetiolar sternum mostly smooth with very low transverse rugulae and undulations; dorsum of abdominal segment 4 with narrow anteromedian strip of transverse striae posteriorly bordered by arching low sulcus; longitudinal striae extend along anterior one-half to one-third of tergite, striae longest medially, becoming progressively shorter laterally, rest of tergite mostly smooth with scattered punctae. Fore coxa mostly smooth with variable degree of transverse strigulae apically in lateral view; fore tarsus opposite strigil with one stout seta. Dorsum of thorax and abdominal segments 1-4 with scattered erect to subdecumbent hairs. Head, mesosoma, petiole, and gaster brown; mandibles, antennae, legs ferruginous.
Lattke (2004) - Metrics (n = 2): HL 1.28,1.29; HW 1.10, 1.09; ML 0.66, 0.68; SL 1.20, 1.22; ED 0.34, 0.35; WL 2.06, 1.98 mm. CI 0.85, 0.85; SI 1.09, 1.12; MI 0.60, 0.62; OI 0.31, 0.32. Pronotum mostly foveolate with dorsomedian smooth area, ventral margin pitted with irregular punctae and strigulae in lateral view; mesonotum longitudinally strigulose-punctate; anepisternum longitudinally strigulose, with scattered foveolae; katepisternum with variable degree of longitudinal strigulae, foveolae and punctae present especially posteriorly.
Lattke (2004) - Metrics (n = 1): HL 0.89, HW 0.74, ML 0.49, SL 0.30, ED 0.34, WL 1.69 mm. CI 0.83, SI 0.41, MI 0.66, OI 0.46. Clypeus with fine longitudinal strigulae, with longitudinal carina extending posterad from clypeus to posterior antennal socket level, reappearing just before median ocellus; gena rugulose; scape mostly smooth with abundant piligerous punctulae, especially basally; frons with irregular rugulae and broad smooth to undulate space in between; mesoscutum mostly smooth with scattered foveolae, axillae longitudinally carinate, scutellum mostly smooth with scattered foveolae; propodeum rugulose with undulate cuticle in between; dorsum of node and gaster mostly smooth.
Lattke (2004) - Holotype worker: New Guinea, Bisianumu, near Sogeri (Wilson) (Museum of Comparative Zoology) [Examined].
- Brown, W. L., Jr. 1958g. Contributions toward a reclassification of the Formicidae. II. Tribe Ectatommini (Hymenoptera). Bull. Mus. Comp. Zool. 118: 173-362 PDF (page 313, worker, queen, male described)
- 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 122, fig. 27 worker, queen, male described)