Endemic to Mauritius island. Occur in rainforests higher altitude between 500 and 800 meters, (mean = 714 m). This species can be collected on low vegetation and in dead stems.
A member of the madecassus species-group. Csősz & Fisher (2016) - This species is easily distinguished from all others in the group by the conspicuous mesothoracic hump on the mesosoma of workers.
Keys including this Species
- Key to Malagasy Nesomyrmex madecassus species-group workers
- Key to Nesomyrmex species groups of the Malagasy region
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
Check data from AntWeb
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- gibber. Ireneopone gibber Donisthorpe, 1946d: 242, figs. 1, 2 (w.) MAURITIUS.
- Combination in Nesomyrmex: Bolton, 2003: 272.
- Status as species: Csősz & Fisher, 2016: 118.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Csősz & Fisher (2016) - Body color: brown. Body color pattern: Body concolorous. Absolute cephalic size: 724 [655, 752]. Cephalic length vs. Maximum width of head capsule (CL/CWb): 1.17 [1.14, 1.18]. Postocular distance vs. cephalic length (PoOc/ CL): 0.41 [0.39, 0.42]. Postocular sides of cranium contour frontal view orientation: converging posteriorly. Postocular sides of cranium contour frontal view shape: convex. Vertex contour line in frontal view shape: straight; slightly concave. Vertex sculpture: main sculpture absent, ground sculpture areolate. Gena contour line in frontal view shape: convex. Genae contour from anterior view orientation: converging; strongly converging. Gena sculpture: ground sculpture areolate, main sculpture absent. Concentric carinae laterally surrounding antennal foramen: absent. Eye length vs. absolute cephalic size (EL/CS): 0.25 [0.24, 0.26]. Frontal carina distance vs. absolute cephalic size (FRS/ CS): 0.33 [0.32, 0.34]. Longitudinal carinae on median region of frons: absent. Smooth median region on frons: present. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.80 [0.78, 0.82]. Median clypeal notch: present. Ground sculpture of submedian area of clypeus: present. Median carina of clypeus: absent. Lateral carinae of clypeus: absent. Metanotal depression: present. Dorsal region of mesosoma sculpture: ground sculpture areolate, main sculpture absent. Lateral region of pronotum sculpture: ground sculpture areolate, main sculpture absent. Mesopleuron sculpture: ground sculpture areolate, main sculpture absent. Metapleuron sculpture: ground sculpture areolate, main sculpture absent. Petiole width vs. absolute cephalic size (PEW/CS): 0.21 [0.20, 0.23]. Anterior profile of petiolar node contour line in lateral view shape: concave. Dorso-caudal petiolar profile contour line in lateral view shape: strongly convex. Dorsal region of petiole sculpture: ground sculpture areolate, main sculpture absent. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.30 [0.27, 0.32]. Dorsal region of postpetiole sculpture: ground sculpture areolate, main sculpture absent.
Csősz & Fisher (2016) - Holotype: “Ireneopone gibber, H. Donistorphe, 1946 TYPE” Mauritius, Calebasses Mt., 22. X. 1944, No 72 leg. R. Mamet (1w, The Natural History Museum, London, U.K., CASENT0102303), [type specimen was morphometrically not investigated, AntWeb images were used for comparison].
- Bolton, B. 2003. Synopsis and Classification of Formicidae. Mem. Am. Entomol. Inst. 71: 370pp (page 272, Combination in Nesomyrmex)
- Csősz, S.; Fisher, B. L. 2016. Taxonomic revision of the Malagasy Nesomyrmex madecassus species-group using a quantitative morphometric approach. ZooKeys 603:105-130 (doi:10.3897/zookeys.603.8271).
- Donisthorpe, H. 1946h. Ireneopone gibber (Hym., Formicidae), a new genus and species of myrmicine ant from Mauritius. Entomol. Mon. Mag. 82: 242-243 PDF(page 242, figs. 1, 2 worker described)
- Fisher, B. L. 1997a. Biogeography and ecology of the ant fauna of Madagascar (Hymenoptera: Formicidae). J. Nat. Hist. 31: 269-302 (see also)
- Mamet, R. 1954. The ants (Hymenoptera Formicidae) of the Mascarene Islands. Mauritius Inst. Bull. 3: 249-259 (see also)