Monomorium angustinode

Identification
Bolton (1987) - M. angustinode belongs to the altinode-complex but is distinguished from all its close relatives by the shape of the propodeum and structure of the propodeal spiracles.

Distribution based on Regional Taxon Lists
Afrotropical Region: Democratic Republic of Congo.

Nomenclature

 *  angustinode. Monomorium angustinode Forel, 1913b: 334 (w.) DEMOCRATIC REPUBLIC OF CONGO. See also: Bolton, 1987: 376.

Worker
Bolton (1987) - TL 1.9-2.0, HL 0.52-0.54, HW 0.39-0.40, CI 74-77, SL 0.36, SI 90-92, PW 0.26-0.28, AL 0.54-0.58 (6 measured).

Clypeal carinae well defined, widely separated and divergent anteriorly, terminating at the anterior clypeal margin in a pair of short projecting denticles. Anterior margin of prominent median portion of clypeus shallowly concave between the pair of short denticles, the latter separating the anterior and lateral margins of the median clypeus. Margin usually with a small indentation at socket of median seta. Maximum diameter of eye 0.24-0.26 x HW and with 7-8 ommatidia in the longest row. In ful1-face view the eyes distinctly in front of the midlength of the side and the antennal scapes, when laid straight back from their insertions, failing to reach the occipital margin. Occipital margin broad in full-face view, the sides straight to feebly convex behind the level of the eyes. Promesonotal dorsum shallowly convex in profile, the mesonotum sloping evenly to the narrow but distinctly impressed metanotal groove. Cross-ribs of metanotal groove short. Propodeal dorsum with a short convex portion immediately behind the metanotal groove, the surface then sloping evenly backwards; the dorsum and declivity forming a single curve, the two not obviously separated. Propodeal spiracle small and placed high on the side of the sclerite. In dorsal view the spiracular orifices prominent, born at the apices of a pair of low tubercles, the dorsum between them broad and almost fiat. Petiole high and narrow, scale-like and narrowly rounded above. Subpetiolar process a narrow inconspicuous strip. Post petiole anteroposteriorly compressed, lower than the petiole and slightly more broadly rounded above, but with a high vertical anterior face. All dorsal surfaces of head and body with standing hairs present, the promesonotum apparently with 4-5 pairs though all specimens available show signs of abrasion. Apart from small hair-pits and the feeble cross-ribs at the metanotum the entirety of the head and body is devoid of sculpture. Colour light brownish yellow, the head and gaster tending to be somewhat darker than the alitrunk.

Type Material
Bolton (1987) - Syntype workers, Zaire: Katanga (= Shaba), Welgelegen, 14.vi.1912, no. 123 (Bequaert) [examined].