Pseudomyrmex osurus

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Pseudomyrmex osurus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Pseudomyrmecinae
Genus: Pseudomyrmex
Species: P. osurus
Binomial name
Pseudomyrmex osurus
(Forel, 1911)

Pseudomyrmex osurus casent0005847 profile 1.jpg

Pseudomyrmex osurus casent0005847 dorsal 1.jpg

Specimen labels



Ward (1989) - Examination of the syntype worker of P. osurus shows this to be a distinct species, differing from Pseudomyrmex faber (F. Smith) by the shape of the petiole (possessing a distinct anterior peduncle and differentiated node, in lateral view), and the smooth, shiny puncticulate head. Enzmann 's description of P. insularis fits P. osurus tolerably well, and agrees more closely with P. osurus than with any other species in the P. laevigatus complex known to me from Central America.

P. osurus is typically concolorous orange (head black in some Costa Rican and Colombian workers, which I take to be this species), while P. faber is more variable, with some workers (including the type) having a dark brown to black head and mesosoma.


Distribution based on Regional Taxon Lists

Neotropical Region: Costa Rica (type locality), Panama.

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.

  • osurus. Pseudomyrma levigata subsp. osura Forel, 1911e: 279 (w.) COSTA RICA. Junior synonym of faber: Kempf, 1958f: 449. Combination in Pseudomyrmex: Ward, 1989: 441. Revived from synonymy, raised to species and senior synonym of insularis: Ward, 1989: 441.
  • insularis. Pseudomyrma laevigata subsp. insularis Enzmann, E.V. 1944: 88 (w.) PANAMA. Junior synonym of faber: Kempf, 1958f: 449; of osurus: Ward, 1989: 441.


Type Material

Syntype worker. Costa Rica (pittier) (Musee d'Histoire Naturelle Genève) [Examined].

Pseudomyrma laevigata subsp. insularis Holotype worker, Barro Colorado Island, Panama (location unknown) [not examined].


  • Forel, A. 1911g. Die Ameisen des K. Zoologischen Museums in München. Sitzungsber. Math.-Phys. Kl. K. Bayer. Akad. Wiss. Münch. 11: 249-303 (page 279, worker described)
  • Kempf, W. W. 1958f. Estudos sôbre Pseudomyrmex. II. (Hymenoptera: Formicidae). Stud. Entomol. (n.s.) 1: 433-462 (page 449, Junior synonym of faber)
  • Ward, P. S. 1989a. Systematic studies on pseudomyrmecine ants: revision of the Pseudomyrmex oculatus and P. subtilissimus species groups, with taxonomic comments on other species. Quaest. Entomol. 25: 393-468 (page 441, Combination in Pseudomyrmex, revived from synonymy, raised to species, and senior synonym of insularis: )