Monomorium notulum

This species inhabits open, e.g. grasslands, and semi-open, e.g. open woodland, areas.

Identification
Bolton (1987) - A member of the M. setuliferum species group. Very closely related to Monomorium ebangaense, notulum is separated only by the minor sculptural characters noted in the key and its slightly larger eyes. Both of these are close to, and perhaps inseparable from, Monomorium setuliferum where the eyes are larger still but tend to be distinctly reniform in shape. Within the bounds of the setuliferum-group, these three forms are distinguished by their dense blanketing sculpture and very reduced dorsal pilosity.

Distribution based on Regional Taxon Lists
Afrotropical Region: Angola, Namibia, South Africa, Zimbabwe.

Nomenclature

 *  notulum. Monomorium setuliferum var. notula Forel, 1910e: 441 (w.m.) SOUTH AFRICA. Raised to species and senior synonym of dolichops, latior: Bolton, 1987: 370.
 * dolichops. Monomorium (Xeromyrmex) setuliferum var. dolichops Santschi, 1928f: 194 (w.) ZIMBABWE. Junior synonym of notulum: Bolton, 1987: 370.
 * latior. Monomorium (Xeromyrmex) setuliferum var. latior Santschi, 1928f: 195 (w.) ANGOLA. Junior synonym of notulum: Bolton, 1987: 370.

Worker
Bolton (1987) - TL 2.0-2.4, HL 0.53-0.60, HW 0.46-0.52, CI 83-87, SL 0.38-0.42, SI 81-87, PW 0.29-0.34, AL 0.59-0.68 (15 measured).

Eye in profile distinctly in front of midlength of side, its anterior angle drawn out into a lobe or blunt point which is directed anteroventrally; the eye not reniform but very obviously much more narrowly rounded anteriorly than posteriorly. Maximum diameter of eye 0·25-0·28 x HW and with 8-9 ommatidia in the longest row. Shape and size of eye showing variation even in a single series. Ventral surface of head with elongate curved hairs present. Metanotal groove impressed in profile. Standing hairs extensively suppressed on dorsal surfaces of body; absent from head behind level of frontal lobes, absent from alitrunk, absent from first gastral tergite in front of the apical transverse row. Fine appressed pubescence is present on all dorsal surfaces of head and body. Dorsum of head blanketed by reticulate-punctate to reticulate-shagreenate sculpture, the mid-dorsal area commonly overlaid by extremely fine scratch-like striolae. Punctate component of sculpture not sharply defined on posterior third of cephalic dorsum but instead with a smeared or amorphous appearance, which may extend over the whole head in some cases. Pronotal dorsum with partially effaced or shagreened reticulate-punctate sculpture, remainder of alitrunk finely reticulate-punctate. First gastral tergite reticulate-shagreenate basally, fading out to superficial reticular patterning apically. Colour brown, varying from yellowish to dark, but usually with the gaster darker in shade than the alitrunk.

Type Material
Bolton (1987) - Syntype workers, male, South Africa: Natal (Haviland) [examined].