Nesomyrmex sikorai

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Nesomyrmex sikorai
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Nesomyrmex
Species group: sikorai
Species: N. sikorai
Binomial name
Nesomyrmex sikorai
(Emery, 1896)

Nesomyrmex sikorai casent0003120 profile 1.jpg

Nesomyrmex sikorai casent0003120 dorsal 1.jpg

Specimen labels

This species is known to occur in montane rainforests between elevations of 200 m and 520 m in central Madagascar.

Identification

A member of the sikorai species-group.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Malagasy Region: Madagascar (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Worker

Nomenclature

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.

Description

Worker

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.

Type Material

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.

References