Polyrhachis ornata

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Polyrhachis ornata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Hedomyrma
Species: P. ornata
Binomial name
Polyrhachis ornata
Mayr, 1876

Polyrhachis ornata casent0905573 p 1 high.jpg

Polyrhachis ornata casent0905573 d 1 high.jpg

Specimen Labels


Nests can be very numerous, with the colonies usually occupying large hollow branches high in trees.



North Queensland to Victoria, where 'P. ornata has been recorded as far south as Bemm River.

Distribution based on Regional Taxon Lists

Australasian Region: Australia (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.

  • ornata. Polyrhachis ornata Mayr, 1876: 73 (w.) AUSTRALIA. Combination in P. (Hedomyrma): Forel, 1915b: 107. Senior synonym of chrysothorax, humerosa: Kohout, 1988c: 435.
  • humerosa. Polyrhachis (Hedomyrma) humerosa Emery, 1921e: 18 (w.) AUSTRALIA. Junior synonym of ornata: Kohout, 1988c: 435.
  • chrysothorax. Polyrhachis (Hedomyrma) chrysothorax Viehmeyer, 1925b: 148 (w.) AUSTRALIA. Wheeler, G.C. & Wheeler, J. 1974a: 62 (l.). Junior synonym of ornata: Kohout, 1988c: 435.

Type Material

Kohout (1988) - The original locality of P. humerosa was given as Adelaide, but I have never seen specimens collected in South Australia. I believe that the locality given by Emery is questionable, more so as the label under a syntype from the MCG reads' Adelaide M', with the edge cut just through the letter 'M'. There apparently is no Adelaide M(ountain) in Australia, but Mount Adelaide is located in the Conondale Range in South East Queensland, where P. ornata is a common species. I suggest that this was the true source of the humerosa types. This is supported by the close similarity between recent Conondale Range collections and the syntype.



  • Forel, A. 1915b. Results of Dr. E. Mjöbergs Swedish Scientific Expeditions to Australia 1910-13. 2. Ameisen. Ark. Zool. 9(1 16: 1-119 (page 107, Combination in P. (Hedomyrma))
  • Kohout, R. J. 1988c. Nomenclatural changes and new Australian records in the ant genus Polyrhachis Fr. Smith (Hymenoptera: Formicidae: Formicinae). Mem. Qld. Mus. 25: 429-438 (page 435, Senior synonym of chrysothorax and humerosa)
  • Mayr, G. 1876. Die australischen Formiciden. J. Mus. Godeffroy 12: 56-115 (page 73, worker described)