Nesomyrmex excelsior

AntWiki: The Ants --- Online
Nesomyrmex excelsior
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Nesomyrmex
Species group: sikorae
Species: N. excelsior
Binomial name
Nesomyrmex excelsior
Csösz & Fisher, 2016

Nesomyrmex excelsior casent0077471 p 1 high.jpg

Nesomyrmex excelsior casent0077471 d 1 high.jpg

Specimen Labels

This species is known to occur in smaller, isolated montane rainforests between elevation of 520 m and 1325 m (mean: 1007 m) in the western and central part of Madagascar.


A member of the sikorai species-group.

Keys including this Species


Latitudinal Distribution Pattern

Latitudinal Range: -13.26206° to -22.675°.

Tropical South

Distribution based on Regional Taxon Lists

Malagasy Region: Madagascar (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.




Images from AntWeb

Nesomyrmex excelsior casent0485106 h 1 high.jpgNesomyrmex excelsior casent0485106 p 1 high.jpgNesomyrmex excelsior casent0485106 d 1 high.jpgNesomyrmex excelsior casent0485106 l 1 high.jpg
Worker. Specimen code casent0485106. Photographer Erin Prado, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.
Nesomyrmex excelsior casent0498265 h 1 high.jpgNesomyrmex excelsior casent0498265 p 1 high.jpgNesomyrmex excelsior casent0498265 d 1 high.jpgNesomyrmex excelsior casent0498265 l 1 high.jpg
Holotype of Nesomyrmex excelsiorWorker. Specimen code casent0498265. Photographer Michele Esposito, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.
Nesomyrmex excelsior casent0499874 h 1 high.jpgNesomyrmex excelsior casent0499874 p 1 high.jpgNesomyrmex excelsior casent0499874 d 1 high.jpgNesomyrmex excelsior casent0499874 l 1 high.jpg
Worker. Specimen code casent0499874. Photographer Erin Prado, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.


The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • excelsior. Nesomyrmex excelsior Csösz & Fisher, 2016b: 15, figs. 3, 9A-C (w.q.) MADAGASCAR.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.



Body color: yellow; brown. Body color pattern: Body concolorous. Absolute cephalic size: 726 μm [671, 799]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.281 [1.218, 1.382]. Postocular distance vs. cephalic length (PoOc/CL): 0.457 [0.437, 0.477]. Postocular sides of cranium contour, anterior view orientation: converging posteriorly. Postocular sides of cranium contour, anterior view shape: convex. Vertex contour line in anterior view shape: straight; feebly convex. Vertex sculpture: main sculpture rugosoreticulate, ground sculpture smooth. Gena contour line in anterior view shape: convex. Genae contour from anterior view orientation: strongly converging. Gena sculpture: rugoso-reticulate with feeble areolate ground sculpture. Concentric carinae laterally surrounding antennal foramen count: present. Eye length vs. absolute cephalic size (EL/CS): 0.233 [0.221, 0.246]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.289 [0.278, 0.304]. Longitudinal carinae on median region of frons count: present. Smooth median region on frons count: absent. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.822 [0.786, 0.872]. Median clypeal notch count: present. Median carina of clypeus count: absent. Spine length vs. absolute cephalic size (SPST/CS): 0.275 [0.24, 0.315]. Minimum spine distance vs. absolute cephalic size (SPBA/CS): 0.225 [0.183, 0.272]. Apical spine distance vs. absolute cephalic size (SPTI/CS): 0.252 [0.198, 0.31]. Propodeal spine shape: straight; triangular, blunt. Apical distance of pronotal spines vs. absolute cephalic size (PSTI/CS): 0.607 [0.573, 0.633]. Metanotal depression count: present. Dorsal region of mesosoma sculpture: rugose with smooth ground sculpture. Lateral region of pronotum sculpture: inconspicuously areolate ground sculpture, main sculpture rugoso-reticulate. Mesopleuron sculpture: smooth round sculpture, superimposed by dispersed rugulae. Metapleuron sculpture: areolate ground sculpture, superimposed by dispersed rugae. Petiole width vs. absolute cephalic size (PEW/CS): 0.233 [0.206, 0.267]. Dorsal region of petiole sculpture: ground sculpture inconspicuously areolate, main sculpture rugoso-reticulate. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.354 [0.321, 0.394]. Dorsal region of postpetiole sculpture: ground sculpture smooth, main sculpture dispersed rugose.

Type Material

Holotype worker: Madagascar: Prov. Toliara, Forêt Classée d'Analavelona, 29.2 km 343° NNW Mahaboboka, Madagascar, 1100 m, -22.675 N, 44.19 E, 18.ii.2003, collection code: BLF07826; CASENT0498265, Fisher et al., ex dead twig above ground montane rainforest (California Academy of Sciences, CASENT0498265);

Paratypes: 8 workers and a single gyne with the same label data with the holotype under CASENT codes: CASENT0763558, BLF07826, (2w, CAS); CASENT0498263, BLF07826, (3w, CAS); CASENT0498264, BLF07826, (3w, CAS); CASENT0498266, BLF07826, (1Q, CAS).


The name (excelsior = higher, loftier) refers to the typically montane occurrence of this species.