Tetramorium anxium

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Tetramorium anxium
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Tetramorium
Species: T. anxium
Binomial name
Tetramorium anxium
Santschi, 1914

Tetramorium anxium casent0235786 p 1 high.jpg

Tetramorium anxium casent0235786 d 1 high.jpg

Specimen Labels

There are collection records from forest, woodland, and shrubland. Additional records of this species from ecological studies (references at the end of this page) likely contain additional biological information.


A member of the Tetramorium simillimum species group.

Bolton (1980) - Among the species of the simillimum species-group in which the frontal carinae are strongly developed and which have conspicuous antennal scrobes only two species, Tetramorium buthrum and T. anxium, lack blanketing reticulate-punctate sculpture on the dorsum of the head. Of these two T. buthrum has the cephalic sculpture reduced to 5 weak longitudinal rugulae as opposed to 8-10 even more feeble rugulae in T. anxium. Coupled with this the ground-sculpture of the dorsum of the head is virtually absent in T. buthrum and it looks much more smooth and shiny than does the head of T. anxium.

Keys including this Species


Latitudinal Distribution Pattern

Latitudinal Range: 10° to -10.0838°.

Tropical South

Distribution based on Regional Taxon Lists

Afrotropical Region: Benin, Cameroun, Gabon, Ghana, Guinea (type locality), Ivory Coast, Togo, United Republic of Tanzania.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb






The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • anxium. Tetramorium pusillum var. anxia Santschi, 1914d: 365, fig. 28 (w.q.) GUINEA. Raised to species: Bolton, 1980: 305.

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



Bolton (1980) - TL 2-0-2:2, HL 0:53-0:55, HW 0:46-0:49, CI 88-90, SL 0-39-0-40, SI 82-83, PW 0:34-0:36, AL 0:60-0:64 (3 measured).

Mandibles finely shagreened or punctulate, not longitudinally striate. Anterior clypeal margin entire, the median clypeal carina strong. Eyes moderate, maximum diameter c. 0-12, about 0.25 x HW, with 7-8 ommatidia in the greatest diameter. Frontal carinae strong, weakly sinuate, extending unbroken almost to occipital margin and markedly more strongly developed than any other longitudinal cephalic sculpture. Antennal scrobes broad and shallow, very distinct, less strongly sculptured than dorsum of head. Propodeal spines in profile a pair of short triangular teeth which are distinctly much shorter and narrower than the metapleural lobes, the latter broadly triangular. Petiole in profile with the dorsum of the node shorter than the height of the tergal portion, the anterior and posterior faces of the node slightly convergent dorsally. In dorsal view the node broader than long. Dorsum of head with feeble, scattered longitudinal rugulae. After the strong frontal carinae the most strongly developed component is the median cephalic carina which is stronger than any other longitudinal rugula. Surface of head with a very weak ground-sculpture, feebly shining. Dorsum of alitrunk with weak rugulae on the pronotum, the spaces between them smooth, virtually unsculptured. Posterior to this the rugulae becoming less conspicuous and the ground-sculpture more distinctly punctulate. Petiole and postpetiole punctulate, the first gastral tergite smooth, unsculptured. Hairs present on all dorsal surfaces of head and body, universally short, stout and blunt. Appendages without hairs but with fairly dense short pubescence. Colour uniform blackish brown, the appendages yellowish brown.

Type Material

Bolton (1980) - Syntype workers, female, GUINEA: Camayenne near Conakry (F. Silvestri) (Naturhistorisches Museum, Basel) [examined].


References based on Global Ant Biodiversity Informatics

  • Bernard F. 1953. La réserve naturelle intégrale du Mt Nimba. XI. Hyménoptères Formicidae. Mémoires de l'Institut Français d'Afrique Noire 19: 165-270.
  • Braet Y., and B. Taylor. 2008. Mission entomologique au Parc National de Pongara (Gabon). Bilan des Formicidae (Hymenoptera) recoltes. Bulletin S. R. B. E./K.B.V.E. 144: 157-169.
  • IZIKO South Africa Museum Collection
  • Santschi F. 1914. Formicides de l'Afrique occidentale et australe du voyage de Mr. le Professeur F. Silvestri. Bollettino del Laboratorio di Zoologia Generale e Agraria della Reale Scuola Superiore d'Agricoltura. Portici 8: 309-385.
  • Taylor B., N. Agoinon, A. Sinzogan, A. Adandonon, Y. N'Da Kouagou, S. Bello, R. Wargui, F. Anato, I. Ouagoussounon, H. Houngbo, S. Tchibozo, R. Todjhounde, and J. F. Vayssieres. 2018. Records of ants (Hymenoptera: Formicidae) from the Republic of Benin, with particular reference to the mango farm ecosystem. Journal of Insect Biodiversity 8(1): 006–029.
  • Yeo K., L. M. M. Kouakou, W. Dekoninck, K. Ouattara, and S. Konate. 2016. Detecting intruders: assessment of the anthropophilic ant fauna (Hymenoptera: Formicidae) in the city of Abidjan and along access roads in Banco National Park (Côte d’Ivoire). Journal of Entomology and Zoological Studies 4(4): 351-359.
  • Yeo K., S. Konate, S. Tiho, and S. K. Camara. 2011. Impacts of land use types on ant communities in a tropical forest margin (Oumé - Cote d'Ivoire). African Journal of Agricultural Research 6(2): 260-274.