Tetramorium opacum

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

Nomenclature

 * esta. Rhoptromyrmex opacus var. esta Forel, 1909b: 59 (w.q.m.) DEMOCRATIC REPUBLIC OF CONGO. Junior synonym of opacus: Brown, 1964c: 15.
 *  opacus. Rhoptromyrmex opacus Emery, in Forel, 1909b: 59 (footnote) (w.) CAMEROUN. Bolton, 1986a: 15 (q.m.). Senior synonym of esta, laeviceps, monodi: 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).