Monomorium xanthognathum

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Monomorium xanthognathum
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Monomorium
Species: M. xanthognathum
Binomial name
Monomorium xanthognathum
Arnold, 1944

Monomorium xanthognathum casent0902187 p 1 high.jpg

Monomorium xanthognathum casent0902187 d 1 high.jpg

Specimen Labels

Besides the type material, collections have been made in Cape Flats Dune Strandveld.


Bolton (1987) - A member of the M. setuliferum species group. A very easily recognizable species, the form of the eyes and mandibles, and the form of sculpture and pilosity coupled with the dimensions given above render xanthognathum unlikely to be confused with any other Afrotropical Monomorium.

The affinities of xanthognathum are, however, in doubt for, although it fits best with other members of the setuliferum-group it is the species which, except for its eyes, most resembles the constituents of the destructor-group. It would be useful to know the male of xanthognathum as this would probably solve the problem immediately, as the known males of the two groups are quite different. For the present, on the evidence of the form of the eyes and lack of transverse sculpture on the propodeal dorsum, I am inclined to place xanthognathum in the setuliferum-group rather than in the destructor-group.

Keys including this Species


Distribution based on Regional Taxon Lists

Afrotropical Region: South Africa (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb




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

  • xanthognathum. Monomorium xanthognathum Arnold, 1944: 9, fig. 15 (w.) SOUTH AFRICA. See also: Bolton, 1987: 371.

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



Bolton (1987) - TL 1.9-2.3, HL 0.48-0.56, HW 0.44-0.51, CI 88-92, SL 0.30-0.37, SI 70-77, PW 0.26-0.30, AL 0·48-0·52 (3 measured).

Mandibles unsculptured, smooth and shining; the only species in either the setuliferum-group or the Afrotropical salomonis-group fauna to have entirely smooth mandibles. Eyes conspicuously far in front of the midlength of the sides, the maximum diameter of the eye 0.32-0.33 x HW. In profile the eyes reniform and strongly oblique with respect to the long axis of the head. Anterior lobe of eye extending forward and downward on the side of the head and in larger workers almost rounding onto the ventral surface of the head. In full-face view the head broad and the scapes relatively short (CI > 85, SI <80). Metanotal groove deeply impressed in profile. Dorsal surfaces of head, alitrunk, petiole, postpetiole and gaster with sparse standing hairs present and with sparse but relatively long decumbent to appressed pubescence on head, alitrunk and gaster dorsally. Dorsal surfaces of head, alitrunk and gaster smooth and shining, unsculptured and featureless except for scattered hair-pits. Sides of alitrunk unsculptured except for the mesopleuron which is punctulate-rugulose, and the bulla of the metapleural gland which has some faint sculpture present. Colour glossy blackish brown to jet black, the mandibles conspicuously bright yellow.

Type Material

Bolton (1987) - Syntype workers, South Africa: Cape Town, nr Lion's Head, 10.v.1939 (The Natural History Museum; Museum of Comparative Zoology) [examined].