Monomorium taedium

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Monomorium taedium
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Monomorium
Species: M. taedium
Binomial name
Monomorium taedium
Bolton, 1987

Monomorium taedium casent0010946 profile 1.jpg

Monomorium taedium casent0010946 dorsal 1.jpg

Specimen labels

Collected from grasslands, semi-open habitats, to closed woodland Acacia habitat via hand collecting, pitfall trapping and in leaf-litter sampling.

Identification

Heterick (2006) - A member of the M. exiguum complex in the M. monomorium species group.

Bolton (1987) - Among the Afrotropical species with only 11 antennal segments taedium is isolated by its relatively large eyes, dark colour, size, and lack of an enlarged and characteristically shaped postpetiole such as is seen in Monomorium bequaerti and its allies. Like Monomorium mictilis and Monomorium fastidium, taedium also lacks a pair of standing hairs on the anterior margin of the pronotum between the humeral pair, but taedium is larger than either of these and has many more ommatidia in the eye.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Afrotropical Region: South Africa (type locality).


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • taedium. Monomorium taedium Bolton, 1987: 415 (w.) SOUTH AFRICA.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

Holotype. TL 1.7, HL 0.46, HW 0.38, CI 83, SL 0.31, SI 82, PW 0.25, AL 0.49.

Clypeal carinae conspicuous, close together posteriorly and widely divergent anteriorly. Anterior margin of prominent median portion of clypeus transverse to exceptionally feebly convex, the anterior margin meeting the sides in an obtuse angle but lacking projecting sharp angles or denticles. Maximum diameter of eye 0.21 x HW, with 6 ommatidia in the longest row. With the head in profile the eye almost as high as long and the outer ring of ommatidia enclosing three longitudinal rows, unlike most other members of the shilohense-complex where the outer ring of ommatidia only encloses a single longitudinal row of 2-4 ommatidia. In full-face view the eyes conspicuously in front of the midlength of the sides of the head. Antennae with 11 segments. Antennal scapes, when laid straight back from their insertions, failing to reach the occipital margin Promesonotum in profile feebly convex and forming a long shallow slope back to the broadly impressed metanotal groove ; the latter with conspicuous cross-ribs. Propodeal dorsum highest immediately behind the metanotal groove, sloping downwards posteriorly and rounding broadly and evenly into the declivity. Propodeal spiracle small. Petiole with a short narrow anterior peduncle which has a very small anteroventral process. Ventral outline of petiole markedly concave from process to level of the spiracle, behind which it is markedly convex beneath the node proper. Petiole node in profile bluntly subconical and rounded above, the postpetiole slightly smaller but much more broadly rounded dorsally. All dorsal surfaces of head and body with standing hairs, the promesonotum with 3-4 pairs but the pronotum lacking a pair on the anterior margin between the humeral pair. Sculpture absent except for metanotal cross-ribs and some faint punctulate areas on the mesopleuron. Colour glossy medium brown.

Paratypes. TL 1.6-1.7, HL 0.42-0.47, HW 0.34-0.38, CI 80-83, SL 0.28-0.31, SI 80-83, PW 0.23-0.26, AL 0.44-0.49 (7 measured). As holotype but some lighter brown in colour. Maximum diameter of eye 0.19-0.22 x HW, the outer ring of ommatidia enclosing three longitudinal rows as in the holotype, or enclosing two rows plus one or two other ommatidia; with 5-6 ommatidia in the longest row.

Type Material

Holotype worker, South Africa: Natal, Umlalazi Nat. Res., 25.iii.1979 (D. J. Brothers) (The Natural History Museum). Paratypes. 7 workers with same data as holotype (BMNH; Museum of Comparative Zoology).

References