Polyrhachis inermis

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Polyrhachis inermis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Myrma
Species: P. inermis
Binomial name
Polyrhachis inermis
Smith, F., 1858

Polyrhachis inermis casent0281391 p 1 high.jpg

Polyrhachis inermis casent0281391 d 1 high.jpg

Specimen Labels



A member of the Polyrhachis inermis species group in the subgenus Myrma

Kohout (2008) - The holotype worker of P. inermis is very similar to specimens from Dumoga-Bone NP and other recently collected material from elsewhere in Sulawesi. However, the modern specimens are generally more slender than the holotype, due to a narrow pronotal dorsum. Their pronotal spines are also slightly less divergent, with the lateral pronotal margins at the bases of spines less emarginate. In addition they have rather distinct longitudinal striation on the mesosomal dorsum which is rather vague in the holotype, notably on the pronotal dorsum. The eyes are fairly convex in the holotype and clearly exceed the outline of the head in full face view, while in most of the recently collected specimens the eyes do not, or only marginally, exceed the lateral cephalic outline.

In Sulawesi there are two inermis-group species:

  • Black throughout . . . . . Polyrhachis inermis
  • Body black; tibiae light to medium reddish-brown with rest of legs distinctly darker . . . . . Polyrhachis orsylla


Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo, Indonesia (type locality), Malaysia, Philippines, Sulawesi.
Oriental Region: Thailand.

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.

  • inermis. Polyrhachis inermis Smith, F. 1858b: 68, pl. 4, figs. 25, 26 (w.) INDONESIA (Sulawesi). Combination in P. (Myrma): Emery, 1925b: 204. Senior synonym of bryanti: Bolton, 1974b: 176.
  • bryanti. Polyrhachis (Myrma) bryanti Donisthorpe, 1942e: 707 (w.) BORNEO. Junior synonym of inermis: Bolton, 1974b: 176.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.


Type Material

Kohout (2008) - Holotype worker. INDONESIA, SULAWESI, The Natural History Museum (examined).