Polyrhachis emeryana

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

Polyrhachis emeryana casent0906791 p 1 high.jpg

Polyrhachis emeryana casent0906791 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Polyrhachis emeryana.


Polyrhachis emeryana is very similar to Polyrhachis expressa from Cape York Peninsula. Both species have widely rounded pronotal shoulders, a propodeum armed with spines and distinctly elongated lateral petiolar spines. However, P. expressa differs by its finer sculpturation, notably on the dorsum of the head and mesosoma, and its less convex pronotal dorsum. The propodeal spines in P. expressa are quite long, columnar and bluntly terminated, while in P. emeryana they are short, triangular and acute. Also, the appressed pubescence in P. expressa is extremely short and inconspicuous, while it is distinctly longer and more prominent in P. emeryana. (Kohout 2006)

Keys including this Species


Polyrhachis emeryana appears to be rare and restricted to the Solomons.

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.

  • emeryana. Polyrhachis (Cyrtomyrma) emeryana Mann, 1919: 390, fig. 59 (w.) SOLOMON IS. See also: Kohout, 2006b: 139.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description. From Kohout (2006): In lieu of the apparently misplaced holotype, my concept of the species is based on a voucher specimen (The Natural History Museum) evidently compared with the holotype by Than (1978), and a few additional specimens collected by P. Greenslade at Mt Austen (Guadalcanal, Solomon Is) (Australian National Insect Collection, Queensland Museum).



Length 5 mm.

Head a little broader than long, broadly rounded behind and rather strongly narrowed in front. Clypeus only moderately convex, shallowly concave at middle of anterior border. Frontal carinae little divergent, extending to opposite middle of eyes, in profile elevated and evenly rounded in front. Antennal scapes surpassing occipital corners by about five eighths of their length. Pronotum broader than long. strongly convex above. Mesoepinotum little convex, the suture indicated by a very shallow and indistinct impression; subangulate between base and declivity. Epinotal spines nearly straight, a little shorter than their distance apart at base. Petiolar node subtriangular in profile, the dorsal edge margined and bearing four spines, the inner pair of which are triangular, as broad basally as long, and the outer elongate-triangular, acute apically and four times as long as the inner pair.

Moderately shining. Finely coriaceous and with minute punctation.

Very fine and short recumbent pubescence thinly distributed on head, body, and appendages.

Color black.

Type Material

SOLOMON IS, Malaita, Auki, col. W.M. Mann. The single type, a holotype worker, cannot be found - as reported by Kohout (2006).


  • Mann, W.M. 1919. The ants of the British Solomon Islands. Bulletin of the Museum of Comparative Zoology at Harvard College 63: 273-391. (page 390, fig. 59 worker described)
  • 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.