Nothing is known about the biology of Megalomyrmex gnomus.
Brandão (1990) - M. gnomus can be easily distinguished from all other species in the Pusillus group by the sharp tooth under the postpetiole, combined with the smooth translucid longitudinal flange under the petiole.
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
Check data from AntWeb
Known only from the worker caste.
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- gnomus. Megalomyrmex gnomus Kempf, 1970b: 359, figs. 5-8 (w.) BRAZIL. See also: Brandão, 1990: 451.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Brandão (1990) - Smooth mandibles with dental formula 2+6; clypeus strongly truncate in lateral view with anterior border round without median denticle; palpal formula 3:1; 12 ocular facets at compound eyes largest diameter; frontal suture not impressed; occipital margin not raised; promesonotal suture obsolete at dorsum; metanotal groove deeply impressed and smooth; dorsal face and declivity of propodeum meeting in a gentle angle; epipetiolar carina complete: non-pedunculate petiole with node slope curve and ventral face with anterior denticle leading to a smooth longitudinal flange; transverse postpetiole with laterally produced spiracles and ventral process in a sharp tooth.
Pilosity: long erect or suberect hairs (exceeding maximum diameter of eyes) at body dorsum, smaller oblique hairs on scapes and legs.
Color: bright yellow with darker gaster.
Brandão (1990) - Brandão (1990) - Corumba, Mato Grosso do Sui, Brasil (19°01 'S, 57°39'W). Holotype and 2 paratypes at Museu de Zoologia de USP. The paratypes bear a label indicating Cuyaba as the locality, while in the original description all types are said to come from Corumba. The late Dr. Goncalves confirmed that all types came from a nest series taken in Corumba. I added a label to the paratypes saying: “Inform. do coletor. Localidade tipo: Corumba, MS. BrasiL CRG. 18.x.i953. CRF. Brandão. 1984”.
- Brandão, C. R. F. 1990b. Systematic revision of the Neotropical ant genus Megalomyrmex Forel (Hymenoptera: Formicidae: Myrmicinae), with the description of thirteen new species. Arq. Zool. (São Paulo) 31: 411-481 (page 451, see also)
- Kempf, W. W. 1970c. Taxonomic notes on ants of the genus Megalomyrmex Forel, with the description of new species (Hymenoptera, Formicidae). Stud. Entomol. 13: 353-364 (page 359, figs. 5-8 worker described)