Thaumatomyrmex atrox

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Thaumatomyrmex atrox
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ponerinae
Tribe: Ponerini
Genus: Thaumatomyrmex
Species: T. atrox
Binomial name
Thaumatomyrmex atrox
Weber, 1939

Thaumatomyrmex atrox casent0010852 profile 1.jpg

Thaumatomyrmex atrox casent0010852 dorsal 1.jpg

Specimen labels

At a Glance • Gamergate  



Kempf (1975) - The presence of a basal denticle on mandibles, the semicircular rugulae between frontal carinae and eyes, and the shallow, circular depression on posterior surface of petiolar node still allow for a clear-cut separation of atrox from Thaumatomyrmex ferox.

Keys including this Species


Distribution based on Regional Taxon Lists

Neotropical Region: Colombia, Costa Rica, Guyana (type locality), Panama, Venezuela.

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.

  • atrox. Thaumatomyrmex atrox Weber, 1939a: 98, fig. 3 (w.) GUYANA. Senior synonym of manni, zeteki: Longino, 1988: 38. See also: Kempf, 1975b: 122; Brandão, Diniz & Tomotake, 1991: 339.



Kemp (1975): paratype. TL 4.4 mm; HL 0.91 mm; HW 1.09 mm; CI 120; ML 1.15 mm; MI 126; IfW 0.65 mm; IfI 60; SL 0.80 mm; SI 88; WL 1.33 mm; PnW 0.64 mm; HfL 0.97 mm; HfI 89; PW 0.73 mm. Extremely close to ferox from which it differs in the following characters:

Head slightly narrower (CI) and mandibles somewhat shorter (MI). The mandibles with a small tooth at base of proximal spine, the intermediate spine not sinuous, almost as long as one half the chord length of apical spine. Rugulae on frontal lobes prolonged caudad by curving laterad towards upper (inner) border of eyes and circumscribing the antennal socket. Greatest length of head both between anteriormost point of frontal lobes and of mandibular acetabula and the posteriormost point of occipital carina. Petiole with the anterior surface of node transversely convex, in profile almost straight (Fig. 26), apex medium rounded, posterior surface as seen from above concave, as seen from the side somewhat convex, showing on its disc a large, shallow circular depression.

Facet count across greatest diameter of eyes: 12 facets in a row. Metanotal groove present. Thorax as in ferox.

Kempf 1975 Thaumatomyrmex 2.jpg Kempf 1975Thaumatomyrmex 3.jpg Kempf 1975 Thaumatomyrmex 4.jpg

Type Material

Kemp (1975): GUIANA: junction of the Mazaruni and Cuyuni rivers, August 20, 1935, among leaves, N. A. Weber leg. 1 female (holotype, Weber collection: Museum of Comparative Zoology). Trinidad: foothills north of Tunapuna, July 29, 1935, among leaves, N. A. Weber leg. 1 female (paratype: WWK, received from Museum of Comparative Zoology); paratype examined.


  • Brandão, C. R. F.; Diniz, J. L. M.; Tomotake, E. M. 1991. Thaumatomyrmex strips millipedes for prey: a novel predatory behaviour in ants, and the first case of sympatry in the genus (Hymenoptera: Formicidae). Insectes Soc. 38: 335-344 (page 339, see also)
  • Delabie, J. H. C.; Fresneau, D.; Pezon, A. 2000. Notes on the ecology of Thaumatomyrmex spp. (Hymenoptera: Formicidae: Ponerinae) in southeast Bahia, Brazil. Sociobiology 36: 571-584 (page 571, see also)
  • Kempf, W. W. 1975b. A revision of the Neotropical ponerine ant genus Thaumatomyrmex Mayr (Hymenoptera: Formicidae). Stud. Entomol. 18: 95-126 (page 122, see also)
  • Longino, J. T. 1988. Notes on the taxonomy of the neotropical ant genus Thaumatomyrmex Mayr (Hymenoptera: Formicidae). Pp. 35-42 in: Trager, J. C. (ed.) Advances in myrmecology. Leiden: E. J. Brill, xxvii + 551 pp. (page 38, Senior synonym of manni and zeteki)
  • Weber, N. A. 1939a. New ants of rare genera and a new genus of ponerine ants. Ann. Entomol. Soc. Am. 32: 91-104 (page 98, fig. 3 worker described)