Tetramorium opacum

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Tetramorium opacum
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Tetramorium
Species: T. opacum
Binomial name
Tetramorium opacum
(Emery, 1909)

Rhoptromyrmex opacus casent0281191 p 1 high.jpg Rhoptromyrmex opacus casent0281191 d 1 high.jpg

Specimen Labels



Keys including this Species


Distribution based on Regional Taxon Lists

Afrotropical Region: Cameroun (type locality), Guinea, Kenya.

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.

  • opacum. Rhoptromyrmex opacus Emery, in Forel, 1909b: 59 (footnote) (w.) CAMEROUN. Combination in Tetramorium: Ward et al., 2014: 15. Bolton, 1986a: 15 (q.m.). Senior synonym of esta, laeviceps, monodi: Brown, 1964c: 15.
  • esta. Rhoptromyrmex opacus var. esta Forel, 1909b: 59 (w.q.m.) DEMOCRATIC REPUBLIC OF CONGO. Junior synonym of opacus: Brown, 1964c: 15.
  • laeviceps. Rhoptromyrmex opacus var. laeviceps Santschi, 1916b: 504 (w.) DEMOCRATIC REPUBLIC OF CONGO. Junior synonym of opacus: Brown, 1964c: 15.
  • monodi. Rhoptromyrmex opacus r. monodi Bernard, 1953b: 251, fig. 14 (w.) GUINEA. Junior synonym of opacus: Brown, 1964c: 15.


Worker with predominantly fine, opaque reticulate-punctulate sculpture over head and mesonotum; in some smaller specimens, the cephalic sculpture may be more shallow and more nearly shining. Metanotal groove present, moderately to deeply impressed. Petiolar node moderate in height, with broadly rounded summit; postpetiole subglobular, slightly wider than petiolar node and wider than long, its ventral surface without a prominent rounded process or tumulus. Color dull yellow to brownish-orange; according to Bernard, the type of subsp. monodi has the occiput and mesonotum blackish-brown. (after Brown, 1964i).