Megalomyrmex pusillus

AntWiki: The Ants --- Online
Megalomyrmex pusillus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Megalomyrmex
Species group: pusillus
Species: M. pusillus
Binomial name
Megalomyrmex pusillus
Forel, 1912

Megalomyrmex pusillus casent0908789 p 1 high.jpg

Megalomyrmex pusillus casent0908789 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Megalomyrmex pusillus.


Brandão (1990) - Forel (1912) observed a wide deep brown transversal band at the first gaster segment, contrasting with the light-yellow body. This condition is not constant for most samples, but it is present in the three available dealated females. I noticed intraspecific variation among workers in terms of color, presence of median seta at the clypeal set, degree of development of the anteromedian clypeal denticle and propodeum shape. The sample from Alto da Serra, SP, Brasil (types and non-types) have extreme values for all measured characters, as already noticed by Borgmeier (1939).


Latitudinal Distribution Pattern

Latitudinal Range: 6.388611111° to -30.0333°.

Tropical South

Distribution based on Regional Taxon Lists

Neotropical Region: Brazil (type locality), Mexico.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.


Brandão (2003) - Of this rather rarely collected, although very distinctive species, I received from Laboratório de Mirmecologia CEPEC / CPDC a worker collected in Poços de Caldas, Minas Gerais state, Brazil (21°48’S, 46°34’W), in October 28, 1991, by A.M.D. Aguiar. This is the first record of this species in Minas Gerais.


Known only from the worker caste.


The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • pusillus. Megalomyrmex pusillus Forel, 1912g: 15 (w.) BRAZIL (São Paulo).
    • Type-material: lectotype worker (by designation of Brandão, 1990b: 453), 2 paralectotype workers.
    • Type-locality: lectotype Brazil: São Paulo, Alto da Serra (Goeldi); paralectotypes with same data.
    • [Note: Brandão, 1990b: 453, points out that the type-locality (Alto da Serra) is in São Paulo state, not Rio de Janeiro as originally stated.]
    • Type-depositories: MHNG (lectotype); MHNG, NHMB (paralectotypes).
    • Brandão, 1990b: 453 (q.).
    • Status as species: Emery, 1922e: 190; Wheeler, W.M. 1925a: 33 (in key); Borgmeier, 1927c: 100; Borgmeier, 1939: 421; Ettershank, 1966: 105; Kempf, 1972a: 140; Brandão, 1990b: 453 (redescription); Brandão, 1991: 355; Bolton, 1995b: 249; Brandão, 2003: 158.
    • Distribution: Brazil.

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 (1-2) + 4; anterior border of clypeus in general round with median denticle; frontal suture not impressed; occipital margin not raised: promesonotal suture when present faintly impressed at dorsum; dorsal face and declivity of propodeum meeting in lateral acute tubercles divergent at apex and laterally compressed: declivity smooth; epipetiolar carina not complete dorsally; ventral face of postpetiole with anterior denticle; postpetiole ventral face without process.

Pilosity: long erect or suberect hairs (exceeding compound eyes diameter) at body dorsum and smaller subdecumbert hairs at clypeus, antennae and legs.

Color: bright light yellow.


Brandão (1990) - Differs from conspecific workers in the following characters: triangular head in frontal view with areas of striation at the antenna! sockets and distal portion of lateral area of clypeus. Ocelli equally developed. Median propodeal depression deeper than in workers. Postpetiolar node distinctly broader than petiolar node.

Type Material

Brandão (1990) - Alto da Serra, SP, Brasil (23°47'S, 46°19'W). Lectotype designation: Lectotype and 1 paralectotype at the Museum de la Ville de Geneve; 1 paralectotype at Naturhistorisches Museum. Basel.


References based on Global Ant Biodiversity Informatics

  • Borgmeier T. 1939. Nova contribuição para o conhecimento das formigas neotropicas (Hym. Formicidae). Revista de Entomologia (Rio de Janeiro) 10: 403-428.
  • Brandão C. R. F. 1990. Systematic revision of the Neotropical ant genus Megalomyrmex Forel (Hymenoptera: Formicidae: Myrmicinae), with the description of thirteen new species. Arquivos de Zoologia (São Paulo) 31: 411-481
  • Brandão C. R. F. 2003. Further revisionary studies on the ant genus Megalomyrmex Forel (Hymenoptera: Formicidae). Papeis Avulsos de Zoologia (São Paulo) 43: 145-159
  • Favretto M. A., E. Bortolon dos Santos, and C. J. Geuster. 2013. Entomofauna from West of Santa Catarina State, South of Brazil. EntomoBrasilis 6 (1): 42-63.
  • Fleck M. D., E. Bisognin Cantarelli, and F. Granzotto. 2015. Register of new species of ants (Hymenoptera: Formicidae) in Rio Grande do Sul state. Ciencia Florestal, Santa Maria 25(2): 491-499.
  • Franco W., N. Ladino, J. H. C. Delabie, A. Dejean, J. Orivel, M. Fichaux, S. Groc, M. Leponce, and R. M. Feitosa. 2019. First checklist of the ants (Hymenoptera: Formicidae) of French Guiana. Zootaxa 4674(5): 509-543.
  • Kempf W. W. 1978. A preliminary zoogeographical analysis of a regional ant fauna in Latin America. 114. Studia Entomologica 20: 43-62.
  • Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
  • Rosa da Silva R. 1999. Formigas (Hymenoptera: Formicidae) do oeste de Santa Catarina: historico das coletas e lista atualizada das especies do Estado de Santa Catarina. Biotemas 12(2): 75-100.
  • Silva R.R., and C. R. F. Brandao. 2014. Ecosystem-Wide Morphological Structure of Leaf-Litter Ant Communities along a Tropical Latitudinal Gradient. PLoSONE 9(3): e93049. doi:10.1371/journal.pone.0093049
  • Suguituru S. S., M. Santina de Castro Morini, R. M. Feitosa, and R. Rosa da Silva. 2015. Formigas do Alto Tiete. Canal 6 Editora 458 pages
  • Ulyssea M.A., C. E. Cereto, F. B. Rosumek, R. R. Silva, and B. C. Lopes. 2011. Updated list of ant species (Hymenoptera, Formicidae) recorded in Santa Catarina State, southern Brazil, with a discussion of research advances and priorities. Revista Brasileira de Entomologia 55(4): 603-–611.