Every Ant Tells a Story - And Scientists Explain Their Stories Here
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Polyrhachis abnormis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Myrmothrinax
Forel, 1915
Type species
Polyrhachis thrinax
35 species

Polyrhachis abnormis castype06960 profile 1.jpg

Polyrhachis abnormis castype06960 dorsal 1.jpg

Specimen labels

This is currently a subgenus of Polyrhachis. Please see Polyrhachis for further information.

Species Groups

Kohout (2008) - The subgenus Myrmothrinax has never been formally subdivided, but with the number of its constituent species rapidly increasing, I am proposing two species-groups, based on the most characteristic feature in the workers, the relative lengths of the petiolar spines. The aequalis-group includes species with the petiolar spines more-or-less subequal or with the middle spine shorter than the lateral pair. The thrinax-group includes those species with a distinctly elongated middle spine.

aequalis species group

Polyrhachis aequalis species-group

thrinax species group

Polyrhachis thrinax species-group


The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • MYRMOTHRINAX [subgenus of Polyrhachis]
    • Myrmothrinax Forel, 1915b: 107 [as subgenus of Polyrhachis]. Type-species: Polyrhachis thrinax, by original designation.
    • Myrmothrinax senior synonym of Evelyna: Hung, 1967b: 402.
  • EVELYNA [junior synonym of Myrmothrinax]
    • Evelyna Donisthorpe, 1937c: 273 [as subgenus of Polyrhachis]. Type-species: Polyrhachis (Evelyna) cheesmanae, by original designation.
    • Evelyna junior synonym of Myrmothrinax: Hung, 1967b: 402.


  • Bolton, B. 2003. Synopsis and Classification of Formicidae. Mem. Am. Entomol. Inst. 71: 370pp (page 124, Myrmothrinax as subgenus of Polyrhachis)
  • Emery, C. 1925d. Hymenoptera. Fam. Formicidae. Subfam. Formicinae. Genera Insectorum 183: 1-302 (page 178, Myrmothrinax as subgenus of Polyrhachis)
  • 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, Myrmothrinax as subgenus of Polyrhachis)
  • Forel, A. 1917. Cadre synoptique actuel de la faune universelle des fourmis. Bull. Soc. Vaudoise Sci. Nat. 51: 229-253 (page 251, Myrmothrinax as subgenus of Polyrhachis)
  • Kohout, R.J. 2008a. A review of the Polyrhachis ants of Sulawesi with keys and descriptions of new species (Hymenoptera: Formicidae: Formicinae). Memoirs of the Queensland Museum. 52:255-317. PDF
  • Wheeler, W. M. 1922i. Ants of the American Museum Congo expedition. A contribution to the myrmecology of Africa. VII. Keys to the genera and subgenera of ants. Bull. Am. Mus. Nat. Hist. 45: 631-710 (page 704, Myrmothrinax as subgenus of Polyrhachis)