Pseudomyrmex tenuissimus

AntWiki: The Ants --- Online
Pseudomyrmex tenuissimus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Pseudomyrmecinae
Genus: Pseudomyrmex
Species: P. tenuissimus
Binomial name
Pseudomyrmex tenuissimus
(Emery, 1906)

Pseudomyrmex tenuissimus casent0173781 profile 1.jpg

Pseudomyrmex tenuissimus casent0173781 dorsal 1.jpg

Specimen labels

At a Glance • Ant-plant specialist  


P. tenuissimus can be distinguished from Pseudomyrmex subtilissimus by its darker color, smaller size, and longer petiole. It differs from Pseudomyrmex spiculus by its smaller size and more elongate head (compare HW and CI).


Latitudinal Distribution Pattern

Latitudinal Range: 19.58333° to -22.809943°.

Tropical South

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina, Belize, Bolivia, Brazil (type locality), Colombia, Costa Rica, Ecuador, El Salvador, French Guiana, Greater Antilles, Guatemala, Guyana, Honduras, Jamaica, Mexico, Nicaragua, Panama, Paraguay, Peru, Suriname, Trinidad and Tobago, Venezuela.

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.


Although P. tenuissimus is the most common member of the P. subtilissimus group, most collections appear to based on scattered foragers. In Costa Rica, Panama, and Colombia, I have encountered workers foraging on vegetation in a variety of habitats including rain forest, rain forest edge, old field/pasture, and tropical dry forest. I have seen nests only twice: one was a small colony containing a single dealate queen, seven workers, and brood, in the dead, fibrous twig of a woody liana, in tropical dry forest (northern Colombia); the other was a nest of 13 workers, 16 alate queens, and brood in the dead twig of a thorny vine at the edge of disturbed second-growth rain forest (Edo. Barinas, Venezuela). Mann (1916:426) recorded a colony from Maranhao, Brazil "taken from beneath a loose piece of bark", an unusual nest-site for Pseudomyrmex as Mann himself remarks.



Images from AntWeb

Pseudomyrmex tenuissimus casent0173782 head 1.jpgPseudomyrmex tenuissimus casent0173782 profile 1.jpgPseudomyrmex tenuissimus casent0173782 profile 2.jpgPseudomyrmex tenuissimus casent0173782 dorsal 1.jpgPseudomyrmex tenuissimus casent0173782 label 1.jpg
Queen (alate/dealate). Specimen code casent0173782. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by ALWC, Alex L. Wild Collection.


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

  • tenuissimus. Pseudomyrma subtilissima subsp. tenuissima Emery, 1906c: 119 (w.) BRAZIL. Wheeler, G.C. & Wheeler, J. 1973d: 207 (l.). Combination in Pseudomyrmex: Kempf, 1972a: 224. Raised to species and senior synonym of culmicola: Ward, 1989: 432.
  • culmicola. Pseudomyrma culmicola Forel, 1912g: 27 (w.) TRINIDAD. Combination in Pseudomyrmex: Kempf, 1972a: 217. Junior synonym of tenuissimus: Ward, 1989: 432.

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



Ward (1989) - measurements (n=30, except for FI where n=29). HL 0.S2-0.93, HW 0.48-0.53, MFC 0.0l1-0.033, CI 0.56-0.62, OI 0.50-0.58, REL 0.48-0.53, REL2 0.84-0.92, OOI 0.22-0.89, VI 0.85-0.90, FCI 0.023-0.066, SI 0.39-0.46, SI2 0.44-0.54, FI 0.52-0.60, PDI 1.58-2.14, MPI 0.022-0.055, NI 0.55-0.64, PLI 0.54-0.66, PWI 0.49-0.60, PPWI 1.05-1.34.

diagnosis. Similar to P. spiculus (q.v.) except as follows: distinctly smaller, head more elongate (HW 0.48-0.53, CI 0.56-0.62). Basal face of propodeum flatter, forming a more distinct angle with the dec1ivitous face. Body color more uniformly brown to grey-brown, the pronotum, petiole, and postpetiole only slightly, or not at all, contrastingly lighter.

Type Material

Ward (1989) - Holotype (unique syntype) worker, Corumba, Matta Grosso [do Sui], Brazil, 15.viii.1900, (Museo Civico di Storia Naturale, Genoa) [Examined].

Pseudomyrma culmicola Holotype (unique syntype) worker, Trinidad (Forel) (Musee d'Histoire Naturelle Genève) [Examined].


References based on Global Ant Biodiversity Informatics

  • Adams B. J., S. A. Schnitzer, and S. P. Yanoviak. 2019. Connectivity explains local ant community structure in a Neotropical forest canopy: a large-scale experimental approach. Ecology 100(6): e02673.
  • Armbrecht I., I. Tischer, and P. Chacon. 2001. Nested subsets and partition patterns in ant assemblages (Hymenoptera, Formicidae) of Colombian dry forest fragments. Pan-Pacific Entomologist 77(3): 196-209.
  • Basset Y., L. Cizek, P. Cuenoud, R. K. Didham, F. Guilhaumon, O. Missa, V. Novotny, F. Odegaards, T. Roslin, J. Schmidl et al. 2012. Arthropod diversity in a tropical forest. Science 338(6113): 1481-1484.
  • Bezdeckova K., P. Bedecka, and I. Machar. 2015. A checklist of the ants (Hymenoptera: Formicidae) of Peru. Zootaxa 4020 (1): 101–133.
  • Brandao, C.R.F. 1991. Adendos ao catalogo abreviado das formigas da regiao neotropical (Hymenoptera: Formicidae). Rev. Bras. Entomol. 35: 319-412.
  • Castano-Meneses, G., M. Vasquez-Bolanos, J. L. Navarrete-Heredia, G. A. Quiroz-Rocha, and I. Alcala-Martinez. 2015. Avances de Formicidae de Mexico. Universidad Nacional Autonoma de Mexico.
  • Dattilo W. et al. 2019. MEXICO ANTS: incidence and abundance along the Nearctic-Neotropical interface. Ecology
  • Emery C. 1906. Studi sulle formiche della fauna neotropica. XXVI. Bullettino della Società Entomologica Italiana 37: 107-194.
  • Enzmann E. V. 1944. Systematic notes on the genus Pseudomyrma. Psyche (Camb.) 51: 59-103.
  • Fernández F., E. E. Palacio, W. P. Mackay, and E. S. MacKay. 1996. Introducción al estudio de las hormigas (Hymenoptera: Formicidae) de Colombia. Pp. 349-412 in: Andrade M. G., G. Amat García, and F. Fernández. (eds.) 1996. Insectos de Colombia. Estudios escogidos. Bogotá: Academia Colombiana de Ciencias Exactas, Físicas y Naturales, 541 pp
  • Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
  • Forel A. 1912. Formicides néotropiques. Part IV. 3me sous-famille Myrmicinae Lep. (suite). Mémoires de la Société Entomologique de Belgique. 20: 1-32.
  • 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.
  • Goitia W., and K. Jaffe. 2009. Ant-Plant Associations in Different Forests in Venezuela. Neotropical Entomology 38(1): 007-031.
  • Gove, A. D., J. D. Majer, and V. Rico-Gray. 2009. Ant assemblages in isolated trees are more sensitive to species loss and replacement than their woodland counterparts. Basic and Applied Ecology 10: 187-195.
  • INBio Collection (via Gbif)
  • Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
  • Longino J. T. 2013. Ants of Honduras. Consulted on 18 Jan 2013.
  • Longino J. T., J. Coddington, and R. K. Colwell. 2002. The ant fauna of a tropical rain forest: estimating species richness three different ways. Ecology 83: 689-702.
  • Longino J. et al. ADMAC project. Accessed on March 24th 2017 at
  • Luna Bello G. O. 2005. Composicion y estructura de la comunidad de hormigas a lo largo de un gradiente de intensificacion agricola en zonas de bosque tropical humedo en la region autonoma Atlantico Sur, Nicaragua. PhD Universidad Centroamericana, Facultad de Ciencia y Tecnologia del Ambiente carrera de Ecologi y Desarrollo. 127 pages
  • Maes, J.-M. and W.P. MacKay. 1993. Catalogo de las hormigas (Hymenoptera: Formicidae) de Nicaragua. Revista Nicaraguense de Entomologia 23.
  • Mann W. M. 1916. The Stanford Expedition to Brazil, 1911, John C. Branner, Director. The ants of Brazil. Bulletin of the Museum of Comparative Zoology 60: 399-490
  • Nascimento Santos M., J. H. C. Delabie, and J. M. Queiroz. 2019. Biodiversity conservation in urban parks: a study of ground-dwelling ants (Hymenoptera: Formicidae) in Rio de Janeiro City. Urban Ecosystems
  • Pires de Prado L., R. M. Feitosa, S. Pinzon Triana, J. A. Munoz Gutierrez, G. X. Rousseau, R. Alves Silva, G. M. Siqueira, C. L. Caldas dos Santos, F. Veras Silva, T. Sanches Ranzani da Silva, A. Casadei-Ferreira, R. Rosa da Silva, and J. Andrade-Silva. 2019. An overview of the ant fauna (Hymenoptera: Formicidae) of the state of Maranhao, Brazil. Pap. Avulsos Zool. 59: e20195938.
  • Silva F. H. O., J. H. C. Delabie, G. B. dos Santos, E. Meurer, and M. I. Marques. 2013. Mini-Winkler Extractor and Pitfall Trap as Complementary Methods to Sample Formicidae. Neotrop Entomol 42: 351–358.
  • Vasquez-Bolanos M. 2011. Checklist of the ants (Hymenoptera: Formicidae) from Mexico. Dugesiana 18(1): 95-133.
  • Ward P. S. 1990. The Ant Subfamily Pseudomyrmecinae (Hymenoptera: Formicidae): Generic Revision and Relationship to Other Formicids. Systematic Entomology 15: 449-489
  • Ward P. S. 1992. Ants of the genus Pseudomyrmex (Hymenoptera: Formicidae) from Dominican amber, with a synopsis of the extant Antillean species. Psyche (Cambridge) 99: 55-85
  • Ward, P. S. 1989. Systematic Studies on Pseudomyrmecine Ants: Revision of the Pseudomyrmex Oculatus and P. Subtilissimus Species Groups with Taxonomic Comments on Other Species. Questiones Entomologicae 25: 393-468
  • Wheeler W. M. 1922. The ants of Trinidad. American Museum Novitates 45: 1-16.
  • Wild, A. L. "A catalogue of the ants of Paraguay (Hymenoptera: Formicidae)." Zootaxa 1622 (2007): 1-55.
  • Yanoviak S. P., and M. Kaspari. 2000. Community structure and the habitat templet: ants in the tropical forest canopy and litter. Oikos 89: 259-266.