Nothing is known about the biology of Monomorium excensurae.
Bolton (1987) - M. excensurae belongs to the schultzei-complex and is closely related to Monomorium bevisi and schultzei itself, the three species possessing a minute and pinhole-like propodeal spiracle. Of the three bevisi is dingy brown in colour and conspicuously more densely hairy than schultzei or excensurae, both of which are yellow. These last two are very closely related and are best separated by the slightly larger eyes and shorter scapes of schultzei. Apart from this the outline shape of the eye is more nearly round in excensurae, whereas in schultzei the longitudinal axis of the eye is more obviously longer than the vertical axis. The clypeal carinae of schultze; are more strongly developed and the area of clypeus between them more deeply concave, and the dorsum of the petiole node in dorsal view is more anteroposteriorly compressed in schultzei.
Keys including this Species
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
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The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- excensurae. Monomorium oscaris var. excensurae Forel, 1915c: 342 (w.) SOUTH AFRICA. Raised to species: Bolton, 1987: 386.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Bolton (1987) - TL 1.9-2.2, HL 0.50-0.58, HW 0.38-0.45, CI 76-79, SL 0.40-0.48, SI 104-110, PW 0.26-0.29, AL 0.50-0.64 (10 measured).
Clypeal carinae close together, subparallel, usually very weakly divergent anteriorly but in some the carinae weakly bowed outwards to their mid lengths then curving in again anteriorly. Prominent median portion of clypeus narrow, its anterior margin transverse to concave between the apices of the carinae and lacking denticles or sharp angles at the junction of its anterior and lateral margins. Maximum diameter of eye 0.20-0.23 x HW and with 5-6 ommatidia in the longest row. In full-face view the posterior margins of the eyes at the midlength of the sides of the head. Antennal scapes, when laid straight back from their insertions, just reaching or fractionally surpassing the occipital margin. Sides of head in full-face view evenly convex, broadest at level of hind margins of eyes; occipital margin very shallowly concave. Promesonotum in profile quite shallowly evenly convex, the highest point in front of the promesonotal midlength and on a higher level than the highest point of the propodeum. Metanotal groove impressed but narrow and traversed by short inconspicuous cross-ribs. Propodeal spiracle minute and pinhole-like. Petiole with a narrow anterior peduncle in profile, the subpetiolar process a small anteroventral lobe which varies in shape and size. Petiole node subconical, the anterior face much longer and more shallowly sloping than the posterior. Postpetiole node smaller, lower and more broadly rounded than the petiole. All dorsal surfaces of head and body with standing hairs, the promesonotum with 4 or 5 pairs. Body and head entirely lacking sculpture except for minute hair-pits and metanotal weak cross-ribs. Colour uniform yellow.
Bolton (1987) - Syntype workers, South Africa: Cape Prov., Kentani (A. Pegler) (Musee d'Histoire Naturelle Genève) [examined].
- Bolton, B. 1987. A review of the Solenopsis genus-group and revision of Afrotropical Monomorium Mayr (Hymenoptera: Formicidae). Bulletin of the British Museum (Natural History). Entomology. 54: 263-452. PDF. (page 386, Raised to species)
- Forel, A. 1915c. Formicides d'Afrique et d'Amérique nouveaux ou peu connus. IIe partie. Bull. Soc. Vaudoise Sci. Nat. 50: 335-364 (page 342, worker described)