Gnamptogenys acuminata

Found in humid forests, nesting in rotten wood.

Identification
A member of the sulcata complex (in the sulcata subgroup of the sulcata species group). The acute posterior tooth on the petiolar node, combined with longitudinal costulae on the declivitous propodeal face, seem to provide the most reliable distinction from Gnamptogenys tortuolosa. Color in G. acuminata is not so variable but light-pigmented forms can occasionally be found. The mesometepisternal suture is usually absent.

Distribution based on Regional Taxon Lists
Neotropical Region: Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela.

Nomenclature

 * . Ectatomma (Gnamptogenys) acuminatum Emery, 1896g: 50 (w.q.) BRAZIL (Pará).
 * Type-material: holotype worker.
 * Type-locality: Brazil: Pará (A. Schulz).
 * Type-depository: MSNG.
 * Combination in Gnamptogenys: Brown, 1958g: 227.
 * Status as species: Emery, 1911d: 45; Borgmeier, 1923: 60; Santschi, 1929h: 476; Brown, 1958g: 227, 299; Kempf, 1961b: 491; Kempf, 1972a: 111; Kempf & Lenko, 1976: 50; Lattke, 1990b: 6; Brandão, 1991: 345; Bolton, 1995b: 208; Lattke, 1995: 154; Lattke, et al. 2004: 341; Lattke, et al. 2007: 262 (in key); Lattke, et al. 2008: 76; Feitosa, 2015c: 98; Guénard & Economo, 2015: 226; Feitosa & Prada-Achiardi, 2019: 670; Camacho, et al. 2020: 460 (in key).
 * Distribution: Bolivia, Brazil, Colombia, Costa Rica, Ecuador, French Guiana, Guyana, Panama, Peru, Suriname, Venezuela.

Description
Mandibles subtriangular; longitudinal costulae on mesosoma and declivitous propodeal face; transverse sutures weak, visible only with certain angles of light; body dark brown to black; coxae and basal two-thirds of femora testaceous to brown-testaceous; tibiae, apex of femora, antenna and mandibles brown.

References based on Global Ant Biodiversity Informatics

 * Arias-Penna T. M. 2008. Subfamilia Ectatomminae. Pp. 53-107 in: Jiménez, E.; Fernández, F.; Arias, T.M.; Lozano-Zambrano, F. H. (eds.) 2008. Sistemática, biogeografía y conservación de las hormigas cazadoras de Colombia. Bogotá: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, xiv + 609 pp.
 * 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.
 * Brandao, C.R.F. 1991. Adendos ao catalogo abreviado das formigas da regiao neotropical (Hymenoptera: Formicidae). Rev. Bras. Entomol. 35: 319-412.
 * Brown W. L., Jr. 1958. Contributions toward a reclassification of the Formicidae. II. Tribe Ectatommini (Hymenoptera). Bull. Mus. Comp. Zool. 118: 173-362.
 * Carvalho Pereira L. P. 2012. Estrutura da comunidade de formigas poneromorfas (Hymenoptera:Formicidae) em uma área da Floresta Amazônica. Master Thesis Universidade Federal Rural do Rio de Janeiro. 64 pages.
 * Costa-Milanez C. B., G. Lourenco-Silva, P. T. A. Castro, J. D. Majer, and S. P. Ribeiro. 2014. Are ant assemblages of Brazilian veredas characterised by location or habitat type? Braz. J. Biol. 74(1): 89-99.
 * Emery C. 1911. Hymenoptera. Fam. Formicidae. Subfam. Ponerinae. Genera Insectorum 118: 1-125.
 * Fernandes I., and J. de Souza. 2018. Dataset of long-term monitoring of ground-dwelling ants (Hymenoptera: Formicidae) in the influence areas of a hydroelectric power plant on the Madeira River in the Amazon Basin. Biodiversity Data Journal 6: e24375.
 * Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
 * Fichaux M., B. Bechade, J. Donald, A. Weyna, J. H. C. Delabie, J. Murienne, C. Baraloto, and J. Orivel. 2019. Habitats shape taxonomic and functional composition of Neotropical ant assemblages. Oecologia 189(2): 501-513.
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 * Gomes E. C. F., G. T. Ribeiro, T. M. S. Souza, and L. Sousa-Souto. 2014. Ant assemblages (Hymenoptera: Formicidae) in three different stages of forest regeneration in a fragment of Atlantic Forest in Sergipe, Brazil. Sociobiology 61(3): 250-257.
 * Groc S., J. H. C. Delabie, F. Fernandez, F. Petitclerc, B. Corbara, M. Leponce, R. Cereghino, and A. Dejean. 2017. Litter-dwelling ants as bioindicators to gauge the sustainability of small arboreal monocultures embedded in the Amazonian rainforest. Ecological Indicators 82: 43-49.
 * Groc S., J. Orivel, A. Dejean, J. Martin, M. Etienne, B. Corbara, and J. H. C. Delabie. 2009. Baseline study of the leaf-litter ant fauna in a French Guianese forest. Insect Conservation and Diversity 2: 183-193.
 * Kempf W. W. 1961. A survey of the ants of the soil fauna in Surinam (Hymenoptera: Formicidae). Studia Entomologica 4: 481-524.
 * 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., and K. Lenko. 1976. Levantamento da formicifauna no litoral norte e ilhas adjacentes do Estado de São Paulo, Brasil. I. Subfamilias Dorylinae, Ponerinae e Pseudomyrmecinae (Hym., Formicidae). Studia Entomologica 19: 45-66.
 * Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
 * Lapola D. M., and H. G. Fowler. 2008. Questioning the implementation of habitat corridors: a case study in interior São Paulo using ants as bioindicators. Braz. J. Biol., 68(1): 11-20.
 * Lattke, J. E. 1990b. Revisión del género Gnamptogenys Roger en Venezuela (Hymenoptera: Formicidae). Acta Terramaris 2: 1-47
 * Miranda P. N., F. B. Baccaro, E. F. Morato, M. A. Oliveira. J. H. C. Delabie. 2017. Limited effects of low-intensity forest management on ant assemblages in southwestern Amazonian forests. Biodivers. Conserv. DOI 10.1007/s10531-017-1368-y
 * 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.
 * Salinas P. J. 2017. Catalogue of the ants (Hymenoptera: Formicidae) of Sucre State, Venezuela, with notes on their biodiversity, biogeography and ecology. Boletin de la Sociedad Entomologica Aragonesa 60: 207-216.
 * 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
 * Soares S. A., D. Lange, and W. F. Antoniali Junior. 2006. Communities of Epigaeic ants (Hymenoptera: Formicidae) in an area of reforestation and in native forest. Sociobiology 49(3): 251-263.
 * Soares S. A., W. F. Antoniali Junior, and S. E. Lima-Junior. 2010. Diversidade de formigas epigéicas (Hymenoptera, Formicidae) em dois ambientes no Centro-Oeste do Brasil. Revista Brasileira de Entomologia 54(1): 7681.
 * Sobrinho T. G., and J. H. Schoereder. 2007. Edge and shape effects on ant (Hymenoptera: Formicidae) species richness and composition in forest fragments. Biodivers Conserv 16: 14591470.
 * Vasconcelos, H.L., J.M.S. Vilhena, W.E. Magnusson and A.L.K.M. Albernaz. 2006. Long-term effects of forest fragmentation on Amazonian ant communities. Journal of Biogeography 33:1348-1356
 * da Silva Araujo, M., Castro Della Lucia, T.M., DA VEIGA, Clayton E y CARDOSO DO NASCIMENTO, Ivan. 2004. Efeito da queima da palhada de cana-de-açúcar sobre comunidade de formicídeos. Ecol. austral. 14(2): 191-200.
 * da Silva de Oliveira A. B., and F. A. Schmidt. 2019. Ant assemblages of Brazil nut trees Bertholletia excelsa in forest and pasture habitats in the Southwestern Brazilian Amazon. Biodiversity and Conservation 28(2): 329-344.