Polyrhachis ugiensis

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Polyrhachis ugiensis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Cyrtomyrma
Species: P. ugiensis
Binomial name
Polyrhachis ugiensis
Mann, 1919

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Specimen Labels

Nothing is known about the biology of Polyrhachis ugiensis.


Polyrhachis ugiensis is most similar to Polyrhachis fulakora. In outline, the pronotal dorsum of Polyrhachis ugiensis is much more convex, especially anteriorly, where it rises from the pronotal collar almost vertically for a short distance and then continues in a convex outline to the promesonotal suture. In contrast, the pronotal dorsum in Polyrhachis fulakora is only weakly convex from the pronotal collar to the promesonotal suture. Also, the lateral petiolar spines in Polyrhachis ugiensis are greatly reduced, while the petiolar spines in Polyrhachis fulakora are more-or-less subequal. Both species differ from the closely allied Polyrhachis johnsoni in having the greatest width of the pronotal dorsum at, or about, the middle of its length. In Polyrhachis johnsoni the greatest width of the pronotal dorsum is across, or just below the humeri. (Kohout 2006)

Keys including this Species


Solomon Islands.

Distribution based on Regional Taxon Lists

Indo-Australian Region: Solomon Islands (type locality).

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.

  • ugiensis. Polyrhachis (Cyrtomyrma) rastellata subsp. ugiensis Mann, 1919: 389 (w.) SOLOMON IS. Raised to species: Donisthorpe, 1938c: 260. See also: Kohout, 2006b: 142.

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



Length 5.5-6 mm.

The specimens from the eastern Solomons represent still another form of this variable species, characterized by the shorter spines of the petiole, which in some specimens have the lateral ones reduced to mere angles, and in the color of the legs. The femora and the tibiae are reddish brown, with the bases of the latter and the tarsi black. The antennae are black, except the extreme tip of the last segment, which is brown.

Type Material

Syntype workers: Museum of Comparative Zoology, Los Angeles County Museum of Natural History, Queensland Museum and National Museum of Natural History - as reported by Kohout (2006).

Type Locality Information

The material the description was based on was stated by Mann to have been collected from: SOLOMON IS, Ugi, Pawa; San Cristoval, Wai-ai, Pamua, Wainoni Bay; Three Sisters, Malapaina.


  • Donisthorpe, H. 1938c. The subgenus Cyrtomyrma Forel of Polyrhachis Smith, and descriptions of new species, etc. Ann. Mag. Nat. Hist. 11(1): 246-267 (page 260, Raised to species)
  • Kohout, R. J. 2006. Review of Polyrhachis (Cyrtomyrma) Forel (Hymenoptera: Formicidae: Formicinae) of Australia, Borneo, New Guinea and the Solomon Islands with descriptions of new species. Memoirs of the Queensland Museum. 52:87-146.
  • Mann, W. M. 1919. The ants of the British Solomon Islands. Bull. Mus. Comp. Zool. 63: 273-391 (page 389, worker described)