Strumigenys urrhobia

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

Strumigenys urrhobia casent0900219 p 1 high.jpg

Strumigenys urrhobia casent0900219 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Strumigenys urrhobia.


Bolton (2000) - A member of the Strumigenys schulzi-group. The material examined from Brazil (a single specimen in MZSP) has the eyes with 4 ommatidia in the longest row and lacks a conspicuously projecting apicoscrobal hair. The eyes are only slightly larger than the Trinidad and Colombia samples where the longest row has 3 ommatidia. This is not considered significant as many species show variation in eye size of this magnitude. Lack of the apicoscrobal hair is of greater significance as location and number of specialised hairs is usually consistent within species, but because only a single specimen is present it is impossible to say whether its absence is natural or the result of abrasion.

S. urrhobia shares a diagnostic dental pattern with Strumigenys emiliae, described in detail under the introductory notes on the species-group. In both species the three stout basal teeth and the broad plate-like fourth tooth tend to be conspicuous, even when the mandibles are fully closed. Both species also have relatively small eyes, slender scapes, convex anterior clypeal margins and postpetiole discs that are not blanketed with dense reticulate-punctate sculpture. The two are easily separated as urrhobia has erect hairs on the vertex and at the pronotal humeri; absent from both these locations in emiliae.

Keys including this Species


Distribution based on Regional Taxon Lists

Neotropical Region: Brazil, Colombia, Ecuador, Trinidad and Tobago (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.

  • urrhobia. Pyramica urrhobia Bolton, 2000: 228, figs. 154, 193 (w.) TRINIDAD. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 130

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



Holotype. TL 1.7, HL 0.44, HW 0.36, CI 82, ML 0.10, MI 23, SL 0.22, SI 61, PW 0.22, AL 0.46. Dentition as described under notes on group. Anterior clypeal margin convex; outer margins of fully closed mandibles passing outside anterolateral clypeal angles in full-face view. Scape slender, in dorsal view not strongly dorsoventrally flattened, broadest distal of the midlength. Eye relatively small, with 3 ommatidia in the longest row. Apicoscrobal hair stout and distinct, slightly thickened apically and weakly curved anteriorly. Cephalic dorsum with a transverse row of 4 long erect hairs behind highest point of vertex, these hairs strongly differentiated from the ground-pilosity which is of small curved narrowly spatulate hairs that are subreclinate. Pronotal humeral hair stout and straight; mesonotum with a single pair of similar standing hairs. Waist segments and first gastral tergite with stout erect hairs that tend to be somewhat thickened apically and curved posteriorly. Dorsal and lateral surfaces of ali trunk reticulate-punctate except for a smooth area on the katepisternum. Ventral surface of petiole with a cuticular carina but lacking a spongiform curtain. Petiole node in dorsal view broader than long, feebly reticulate-punctate. Disc of post petiole superficially sculptured, weakly granulate, not smooth but not reticulate-punctate. Basigastral costulae sharply defined, remainder of tergite smooth.

Paratypes. TL 1.7-1.8, HL 0.44-0.46, HW 0.36-0.38, CI 80-84, ML 0.10-0.11, MI 22-24, SL 0.2-0.24, SI 60-63, PW 0.22-0.26, AL 0.46-0.48 (6 measured).

Type Material

Holotype worker, Trinidad: Mayaro, 5.viii.1976 (J. Noyes) (The Natural History Museum).

Paratypes. 2 workers Trinidad: Arena Res., 3.viii.1976 (J. Noyes); 2 workers Trinidad: Brasso, 28.vii.1976 (J. Noyes); 4 workers Colombia: Putumayo, Villa Garzon, 14.viii.1977 (D. Jackson) (The Natural History Museum, Museum of Comparative Zoology, Museu de Zoologia da Universidade de Sao Paulo).


  • Baroni Urbani, C. & De Andrade, M.L. 2007. The ant tribe Dacetini: limits and constituent genera, with descriptions of new species. Annali del Museo Civico di Storia Naturale “G. Doria”. 99:1-191.
  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 228, figs. 154, 193 worker described)