Strumigenys rotogenys

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Strumigenys rotogenys
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. rotogenys
Binomial name
Strumigenys rotogenys
Bolton, 2000

Strumigenys rotogenys casent0179672 p 1 high.jpg

Strumigenys rotogenys casent0179672 d 1 high.jpg

Specimen Labels

Collected from numerous mesic forest habitats, specimens have been found in litter, clay banks, a soil nest, and a knot of dead wood.


Bolton (2000) - A member of the Strumigenys chapmani-group.Most specimens of this species are covered with a dense coat of fine soil or mud particles on the dorsal surfaces of the head and alitrunk that is held in place by the curved pilosity.

Within the group only this species and its sibling Strumigenys gyrogenys have flagellate hairs on the first gastral tergite. All others have gastral pilosity that is stout and stiff, remiform to weakly clavate. Characters distinguishing rotogenys and gyrogenys are given under the latter.

Keys including this Species


Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo (type locality), Brunei Darussalam, Indonesia, Malaysia.
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.

  • rotogenys. Strumigenys rotogenys Bolton, 2000: 769, figs. 426, 491 (w.) BORNEO.

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



Holotype. TL 3.1, HL 0.96, HW 0.94, CI 98, ML 0.44, MI 46, SL 0.45, SI 48, PW 0.34, AL 0.78. Head very broad and markedly dorsoventrally flattened. Apicoventral tooth of the tridentate apical fork strongly rolled under, in dorsal view arising from the ventral surface of the mandible some distance proximal of the apex; with the appearence of a ventrally-arising preapical tooth. Apicoventral tooth with a poorly defined minute denticle or short crest dorsally, close to its midlength. Scapes strongly dorsoventrally flattened, the leading edge lamellate and convex. Ventrolateral margin of head with a deep, evenly concave preocular impression. Ventral surface of head behind eyes with a deep transverse impression that is separated from the preocular impression only by a narrow convex isthmus of cuticle immediately below the eye. In profile ventrolateral margin of head strongly concave and sharply marginate immediately behind the eye. Cephalic dorsum finely reticulate-rugulose. Cuticle within the deep scrobe very finely shagreenate and dull. Promesonotal dorsum smooth and shining, propodeal dorsum weakly superficially reticulate-punctate. Side of alitrunk and disc of postpetiole smooth. Basigastral costulae weakly defined and shorter than the length of the postpetiole disc. Cephalic dorsum with ground-pilosity of abundant short curved hairs that are spatulate to spoon-shaped. In full-face view similar hairs form a dense row along entire dorsolateral margin of head. A longer, stouter, flattened apicoscrobal hair is present and a similar but less conspicuous hair occurs at the extreme posterior apex of the occipital lobe (this hair apparently very easily lost); cephalic dorsum otherwise without standing pilosity of any form. Promesonotum with elevated but strongly curved thick hairs that are spatulate to weakly remiform and quite short. Postpetiole and gaster with numerous long fine flagellate hairs that contrast strongly with the promesonotal pilosity. Hairs that project from hind basitarsi flagellate and very long.

Paratypes. TL 3.0-3.2, HL 0.91-1.00, HW 0.93-1.00, CI 98-102, ML 0.44-0.46, MI 45-49, SL 0.42-0.47, SI 43-48, PW 0.32-0.36, AL 0.72-0.80 (12 measured).

Dimensions of non-paratypic workers. TL 3.0-3.6, HL 0.93-1.12, HW 0.93-1.08, CI 96-102, ML 0.44-0.50, MI 45-51, SL 0.42-0.51, SI 45-50, PW 0.32-0.40, AL 0.72-0.90 (15 measured).

Type Material

Holotype worker, Malaysia: Sarawak, 4th Division, G. Mulu Nat. Pk, RGS Expd., Long Pala, 27.ix.1977, lowland rainforest, soil nest (B. Bolton) (The Natural History Museum).

Paratypes, 41 workers with same data as holotype (BMNH, Museum of Comparative Zoology, Museo de Historia Natural, Bogata, Los Angeles County Museum of Natural History, University of California, Davis, California Academy of Sciences).

Determination Clarifications

This species was referred to as Strumigenys sp. 8 in Bolton, 1998b: 92.


  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 769, worker described)
  • Mezger, D. & Pfeiffer, M. 2008. Record of a mixed colony of two dacetine species: Strumigenys rotogenys and Pyramica mitis (Myrmicinae) from Gunung Mulu National Park, Sarawak, Malaysia. Asian Myrmecology 2, 125-127.