Tetramorium opacum

Distribution based on Regional Taxon Lists
Afrotropical Region: Cameroun, Guinea, Kenya.

Nomenclature

 *  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.

Description
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).

Type Material
Bolton (1976) - Syntype workers, Cameroun. (Conradt),.

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.
 * Bolton B. 1976. The ant tribe Tetramoriini (Hymenoptera: Formicidae). Constituent genera, review of smaller genera and revision of Triglyphothrix Forel. Bulletin of the British Museum (Natural History). Entomology 34:281-379.
 * Bolton B. 1986. A taxonomic and biological review of the tetramoriine ant genus Rhoptromyrmex (Hymenoptera: Formicidae). Systematic Entomology 11: 1-17.
 * Brown W. L., Jr. 1964. Rhoptromyrmex opacus, new synonymy of, and brief characterization. Pilot Regist. Zool. Card No. 15.
 * Dejean A., F. Azemar, R. Cereghino, M. Leponce, B. Corbara, J. Orivel, and A. Compin. 2015. The dynamics of ant mosaics in tropical rainforests characterized using the SelfOrganizing Map algorithm. Insect Science doi: 10.1111/1744-7917.12208
 * Medler J. T. 1980: Insects of Nigeria - Check list and bibliography. Mem. Amer. Ent. Inst. 30: i-vii, 1-919.
 * Wheeler W. M. 1922. Ants of the American Museum Congo expedition. A contribution to the myrmecology of Africa. II. The ants collected by the American Museum Congo Expedition. Bulletin of the American Museum of Natural History 45: 39-269.
 * Wheeler W. M. 1922. Ants of the American Museum Congo expedition. A contribution to the myrmecology of Africa. VIII. A synonymic list of the ants of the Ethiopian region. Bulletin of the American Museum of Natural History 45: 711-1004