Cyphomyrmex laevigatus

Cyphomyrmex laevigatus seems to be a denizen of the soil in woodland. The Surinam catches came from primary forest and were secured from pitfall traps and desiccated soil samples (Kempf 1966).

Identification
Mera-Rodriguez, et al. (2020) - Mesosoma completely unarmed, propodeum in profile evenly rounded; and petiolar node in dorsal view strikingly transverse, thrice as broad as long (Kempf 1965).

Distribution
Mera-Rodriguez, et al. (2020) - Cyphomyrmex laevigatus is widely distributed in northern South America, including Bolivia, northern Brazil (Amazonas, Maranhão, Mato Grosso, Pará, and Rondônia), Colombia, Ecuador, Paraguay, Perú and Venezuela (Mayhé-Nuñes and Jaffé 1998; Souza et al. 2018).

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

Castes
Female and male unknown.

Nomenclature

 *  laevigatus. Cyphomyrmex (Cyphomannia) laevigatus Weber, 1938b: 184, figs. 20, 21 (w.) BOLIVIA. See also: Kempf, 1966: 178; Snelling, R.R. & Longino, 1992: 493.

Worker
Kempf (1966) - (lectotype) Total length 3.5 (3.3-3.7) mm; head length 0.91 (0.85-0.96) mm; head width 0.88 (0.85-0.96) mm; thorax length 1.20 (1.07-1.23) mm; hind femur length 0.91 (0.85-0.94) mm. Rather close to Cyphomyrmex bicornis with the following differential characters:

Head (fig 4) dorsally with vestigial longitudinal rugae. Clypeus with a small to vestigial accessory tooth mesad of antero-lateral one. Auriculate occipital lobes slightly less projecting caudad. Antennal scape rather abruptly thickened after basal third. Eyes with about 9 facets across greatest diameter.

Thorax (fig 26) completely unarmed on dorsum. Pronotal disc laterally rather sharply carinate. Mesoepinotal junction not deeply impressed, but with a distinct mesoepinotal suture. Fore femora dorso-apically with a short longitudinal, lamellate carinule. Hind femora (fig 41) as in bicornis, not longer than maximum head width.

Pedicel (fig 26,32). Petiole much shorter and broader, likewise without dorsal ridges. Postpetiole with a weak impression laterally, discad of posterior border; the latter vestigially notched in the middle.

Hairs minute, fine, strictly appressed, less conspicuous than in bicornis.

Type Material
Kempf (1966) - 12 workers from a single nest series; 4 workers (lectotype and paratypes) examined (NAW, MCZ).

References based on Global Ant Biodiversity Informatics

 * Alonso L. E., J. Persaud, and A. Williams. 2016. Biodiversity assessment survey of the south Rupununi Savannah, Guyana. BAT Survey Report No.1, 306 pages.
 * Escalante Gutiérrez J. A. 1993. Especies de hormigas conocidas del Perú (Hymenoptera: Formicidae). Revista Peruana de Entomología 34:1-13.
 * 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.
 * 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.
 * 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. 1968. A new species of Cyphomyrmex from Colombia, with further remarks on the genus (Hymenoptera, Formicidae). Revista Brasileira de Biologia 28: 35-41.
 * Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
 * Kusnezov N. 1953. La fauna mirmecológica de Bolivia. Folia Universitaria. Cochabamba 6: 211-229.
 * 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.
 * 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
 * Palacio G., E.E. and F. Fernandez. 1995. Hormigas de Colombia V: Neuvos registros. Tacaya 4:6-7
 * 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.
 * Snelling R. R., and J. T. Longino. 1992. Revisionary notes on the fungus-growing ants of the genus Cyphomyrmex, rimosus group (Hymenoptera: Formicidae: Attini). Pp. 479-494 in: Quintero, D.; Aiello, A. (eds.) 1992. Insects of Panama and Mesoamerica: selected studies. Oxford: Oxford University Press, xxii + 692 pp.
 * Weber N. A. 1938. The biology of the fungus-growing ants. Part IV. Additional new forms. Part V. The Attini of Bolivia. Rev. Entomol. (Rio J.) 9: 154-206.
 * Wild, A. L.. "A catalogue of the ants of Paraguay (Hymenoptera: Formicidae)." Zootaxa 1622 (2007): 1-55.