Anochetus isolatus

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Anochetus isolatus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ponerinae
Tribe: Ponerini
Genus: Anochetus
Species: A. isolatus
Binomial name
Anochetus isolatus
Mann, 1919

Anochetus isolatus ANIC32-016928 side 25-AntWiki.jpg

Anochetus isolatus ANIC32-016928 top 25-AntWiki.jpg

Specimen labels


This is a wide ranging species known from the Philippines south to the Solomon Islands and westward to the tip of Cape York Peninsula, Queensland. It is one of only two Australian Anochetus species which also occurs outside Australia. It is found in rainforest where it nests in rotten wood.


The distinctive shape of the petiolar node, being drawn dorsally into a narrow, blunt point, will separate this species from all others in Australia. Additionally, the pronotum is relatively narrower and the eye relatively smaller than in most other Australian species.

Keys including this Species


Distribution based on Regional Taxon Lists

Australasian Region: Australia.
Indo-Australian Region: Indonesia (type locality), New Guinea, Philippines, 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.

  • isolatus. Anochetus cato subsp. isolatus Mann, 1919: 302, fig. 11 (w.m.) SOLOMON IS. Raised to species: Wilson, 1959a: 508. Senior synonym of rossi, splendens: Brown, 1978c: 557 (see also p. 585). See also: Shattuck & Slipinska, 2012: 13.
  • splendens. Anochetus splendens Karavaiev, 1925c: 289, fig. 11 (q.) INDONESIA (Aru I.). Junior synonym of isolatus: Brown, 1978c: 557.
  • rossi. Anochetus rossi Donisthorpe, 1949c: 747 (w.q.) NEW GUINEA. [Unresolved junior primary homonym of rossi Donisthorpe, above.] Junior synonym of isolatus: Brown, 1978c: 557.

Type Material

  • Anochetus cato isolatus: Syntype, worker(s) and male(s), "several small colonies" from Graciosa Bay, Santa Cruz Island, Solomon Islands, Museum of Comparative Zoology.
  • Anochetus rossi: Syntype, 1 worker, 1 queen, Finschhafen, Papua New Guiniea, California Academy of Sciences.
  • Anochetus splendens: Holotype, queen, Wammar, Aru Island, Indonesia.

Taxonomic Notes

The concept of this species adopted by Shattuck & Slipinska (2012) follows that developed by Brown (1978), noting that Brown left many questions concerning the taxonomy of this species and close relatives unanswered. The specific specimens examined match each other very closely in sculpturing and show minimal variation in colour. However, a wide range of additional material is present in ANIC which varies from this pattern in the development of sculpturing and colour, most of which was outlined by Brown (1978). The true status of this and related species will require a detailed study of this additional material.


Worker description. Sculpturing on front of head extending slightly beyond eyes. Scapes just reaching posterolateral corners ('lobes') of head; lacking or with a few short, inclined erect hairs. Pronotum and mesonotum smooth and shining. Dorsal surface of propodeum with transverse striations which extend laterally to the level of the spiracle and propodeal lobe. Propodeal angles rounded. Metanotal groove with coarse striations. Petiolar node drawn dorsally into a narrow point, lacking sculpture. Erect hairs on hind tibiae short, scattered and inclined. Colour dark brown, petiole, gaster and legs yellow to yellow-red, antennae, mandibles and posterior corners of head slightly lighter in colour than remainder of head capsule.

Measurements. Worker (n = 5): CI 86–90; EI 12–15; EL 0.15–0.20; HL 1.39–1.72; HW 1.25–1.49; HFL 1.14–1.38; ML 1.68–1.99; MandL 0.76–0.93; MTL 0.82–1.04; PronI 53–55; PronW 0.68–0.80; SL 1.09–1.29; SI 87–91.


  • Brown, W. L., Jr. 1978c. Contributions toward a reclassification of the Formicidae. Part VI. Ponerinae, tribe Ponerini, subtribe Odontomachiti. Section B. Genus Anochetus and bibliography. Stud. Entomol. 20: 549-638 (page 557, senior synonym of rossi and splendens)
  • Mann, W. M. 1919. The ants of the British Solomon Islands. Bull. Mus. Comp. Zool. 63: 273-391 (page 302, fig. 11 worker, male described)
  • Shattuck, S.O. & Slipinska, E. 2012. Revision of the Australian species of the ant genus Anochetus (Hymenoptera Formicidae). Zootaxa 3426, 1–28.
  • Wilson, E. O. 1959c. Studies on the ant fauna of Melanesia V. The tribe Odontomachini. Bull. Mus. Comp. Zool. 120: 483-510 (page 508, raised to species)