Polyrhachis dahlii

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Polyrhachis dahlii
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Myrmothrinax
Species: P. dahlii
Binomial name
Polyrhachis dahlii
Forel, 1901

Polyrhachis dahlii casent0906579 p 1 high.jpg

Polyrhachis dahlii casent0906579 d 1 high.jpg

Specimen Labels

As noted by Mann (1919), P. dahlii appears to be a relatively rare species, with its distribution centred on the Bismarck Archipelago. However, there are a few records of the species from New Britain (Gazelle Peninsula, Vunakanau, 11-20.v.1955; Kerevat, 2.ix.1955; Baining Mts, St Pauls, 4.ix.1955 – all J.L. Gressitt), and from the Solomons (San Christoval, Wainoni Bay; Three Sisters, Malapaina; Malaita, Auki; Florida, Tulagi – all W.M. Mann; Guadalcanal, Honiara, 13-16.xi.1953, J.D. Bradley). (Modified from Kohout, 2012.)


Kohout (1998) suggested Polyrhachis dahli unisculpta to be a junior synonym of Polyrhachis queenslandica and, consequently, a separate taxon from P. dahlii. To verify the identity of the three names, Kohout (2012) directly compared the syntypes of all taxa and confirmed that P. queenslandica and P. dahli unisculpta are undoubtedly conspecific and P. dahlii is a distinct species. The most obvious character separating P. dahlii from P. queenslandica is colour which, in the former, is yellow or very light yellowish brown with only the mandibular teeth, anterior clypeal margin, frontal carina and the lateral margins of pronotum and mesonotum narrowly bordered with brown. In contrast, P. queenslandica is virtually black or dark reddish-brown with the head a shade darker. The sculpturation of the head and mesosoma in P. dahlii is rather coarsely reticulate-punctate, while it is distinctly finer in P. queenslandica. The gaster in both species is very finely shagreened and highly polished. (Modified from Kohout, 2012.)


Distribution based on Regional Taxon Lists

Indo-Australian Region: New Guinea, Solomon Islands.

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.

  • dahlii. Polyrhachis dahlii Forel, 1901b: 30 (w.) NEW GUINEA (Bismarck Archipelago). Combination in P. (Myrmothrinax): Mann, 1919: 378. See also: Kohout, 2012: 35.

Syntype workers from Ralum, Bismarch Archipelago, 17.iii.97 (F. Dahl) (Berlin Museum für Naturkunde der Humboldt-Universität, Musee d'Histoire Naturelle Genève, Queensland Museum) (examined by Kohout, 2012).



  • Forel, A. 1901c. Formiciden aus dem Bismarck-Archipel, auf Grundlage des von Prof. Dr. F. Dahl gesammelten Materials. Mitt. Zool. Mus. Berl. 2: 4-37 (page 30, worker described)
  • Kohout, R.J. 1998. New synonyms and nomenclatural changes in the ant genus Polyrhachis Fr. Smith (Hymenoptera:Formicidae: Formicinae). Memoirs of the Queensland Museum 42(2): 505-531.
  • Kohout, R.J. 2012. A review of the Australian Polyrhachis ants of the subgenera Myrma Billberg, Myrmatopa Forel, Myrmothrinax Forel and Polyrhachis Fr. Smith (Hymenoptera: Formicidae: Formicinae). Memoirs of the Queensland Museum – Nature 56(1): 25-59.
  • Mann, W. M. 1919. The ants of the British Solomon Islands. Bull. Mus. Comp. Zool. 63: 273-391 (page 378, Combination in P. (Myrmothrinax))