Polyrhachis retrorsa

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Polyrhachis retrorsa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Myrmhopla
Species: P. retrorsa
Binomial name
Polyrhachis retrorsa
Emery, 1900

Polyrhachis retrorsa casent0905602 p 1 high.jpg

Polyrhachis retrorsa casent0905602 d 1 high.jpg

Specimen Labels

Specimens have been collected from fogging samples in natural forest and within an elevation range of 400-1080m.


A member of the Polyrhachis mucronata species group.

Kohout (2008) - Polyrhachis retrorsa bears a very close resemblance to Polyrhachis mitrata from the Philippines but direct comparison of the types of both species supports their separate specific status. Polyrhachis mitrata has a narrower mesosoma with the pronotal humeri angular and the propodeal and petiolar spines distinctly more slender. The petiole in lateral view has a weakly convex anterior face, an almost straight posterior face and a rather narrow dorsum that bears a pair of minute, posteriorly directed, intercalary teeth. Polyrhachis mitrata is black with the legs and gaster medium reddish-brown and the antennae a shade darker and the body is covered with whitish pubescence that is rather diluted, notably on dorsum of the head, mesosoma and gaster. However, the syntype examined appears to be a worn specimen. In contrast, the pronotal humeri in P. retrorsa are unarmed and widely rounded and the propodeal spines shorter and broader at their bases. In profile, both faces of the petiole are convex and only slightly converge towards the widely rounded dorsum. The petiole generally lacks intercalary teeth, although rudimentary teeth are evident beneath the pubescence in a few specimens. Polyrhachis retrosa is black with reddish-brown appendages and has relatively long, appressed, silvery-grey pubescence that clearly distinguishes the species from the other, mostly jet black members of the mucronata-group.

Keys including this Species


Distribution based on Regional Taxon Lists

Indo-Australian Region: Indonesia (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.

  • retrorsa. Polyrhachis retrorsa Emery, 1900d: 719 (w.q.) INDONESIA (Mentawei I.). Combination in P. (Myrmhopla): Emery, 1925b: 196.

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) - Syntype worker, queens. INDONESIA, Mentawei I., Sipora, Sereinu (E. Modigliani), Museo Civico di Storia Naturale, Genoa (examined).