This species is known to occur in montane rainforests between elevations of 200 m and 520 m in central Madagascar.
A member of the sikorai species-group.
Keys including this Species
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.
- sikorai. Leptothorax (Goniothorax) sikorai Emery, 1896g: 63 (w.) MADAGASCAR.
- Combination in Nesomyrmex: Bolton, 2003: 272.
- Status as species: Bolton, 1995b: 244; Csösz & Fisher, 2016b: 25 (redescription).
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Csösz and Fisher (2016) - Body color: black. Body color pattern: concolorous. Absolute cephalic size: 822 μm [748, 890]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.169 [1.126, 1.226]. Postocular distance vs. cephalic length (PoOc/CL): 0.488 [0.451, 0.511]. Postocular sides of cranium contour, anterior view orientation: converging posteriorly. Postocular sides of cranium contour, anterior view shape: strongly convex. Vertex contour line in anterior view shape: straight to feebly convex. Vertex sculpture: main sculpture areolate, ground sculpture areolate. Gena contour line in anterior view shape: convex. Gena contour from anterior view orientation: strongly converging. Gena sculpture: rugoso-reticulate with areolate ground sculpture. Concentric carinae laterally surrounding antennal foramen: present. Eye length vs. absolute cephalic size (EL/CS): 0.212 [0.201, 0.224]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.292 [0.276, 0.312]. Longitudinal carinae on median region of frons: present. Smooth median region on frons: absent. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.828 [0.78, 0.862]. Median clypeal notch: present. Median carina of clypeus: present or absent. Spine length vs. absolute cephalic size (SPST/CS): 0.269 [0.221, 0.301]. Minimum spine distance vs. absolute cephalic size (SPBA/CS): 0.253 [0.215, 0.287]. Apical spine distance vs. absolute cephalic size (SPTI/CS): 0.299 [0.256, 0.341]. Propodeal spine shape: straight; triangular, blunt. Apical distance of pronotal spines vs. absolute cephalic size (PSTI/CS): 0.665 [0.636, 0.691]. Metanotal depression: present. Dorsal region of mesosoma sculpture: areolate main sculpture, interstices areolate. Lateral region of pronotum sculpture: areolate ground sculpture, main sculpture areolate. Mesopleuron sculpture: areolate ground sculpture, superimposed by dispersed rugae. Metapleuron sculpture: areolate ground sculpture, superimposed by coarse rugae. Petiole width vs. absolute cephalic size (PEW/CS): 0.269 [0.228, 0.326]. Dorsal region of petiole sculpture: ground sculpture areolate, main sculpture rugoso-reticulate. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.37 [0.348, 0.391]. Dorsal region of postpetiole sculpture: ground sculpture smooth, main sculpture absent.
Csösz and Fisher (2016) - Holotype worker: “Leptothorax sikorai n. sp., Imerina [Antananarivo, -18.91 N, 47.55 E], Sikora” TYPUS (Musee d'Histoire Naturelle Genève, CASENT0102064). Note: the type was not available for morphometric investigation; high-quality 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)
- Csösz, S. & Fisher, B.L. 2016b. Toward objective, morphology-based taxonomy: a case study on the Malagasy Nesomyrmex sikorae species group. PLoS ONE 11 (4): 31 pp. e0152454. doi: 10.1371/journal.pone.0152454.
- Emery, C. 1896g. Studi sulle formiche della fauna neotropica. XVII-XXV. Bull. Soc. Entomol. Ital. 28: 33-107 (page 63, worker described)