Simopelta species groups
The information below is based on MacKay, W.P., MacKay, E.E. 2008. Revision of the ants of the genus Simopelta Mann (pp. 285-328). In Jíminez, E., Fernández, F., Arias, T.M. & Lozano-Zambrano, F.H. (eds). Sistematica, biogeografia y conservación de las hormigas cazadoras de Colombia: 609 pp. Instituto Alexander von Humboldt, Bogota. PDF
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curvata species complex
The workers in this species complex are mostly small, with the total length usually being less than 4 mm (S. mayri is larger). The anterior medial border of the clypeus nearly always has an elongated spine or at least forms a sharp point. The dorsum of the mesosoma is slightly depressed, and the petiole is narrow.
Simopelta bicolor, a southeastern Brasilian species, can be recognized, as the mandibles have more than four teeth, and the two apicalmost teeth are not noticeably separated from the other teeth. Simopelta minima is a tiny (Total Length 2.5 mm), southeastern Brasilian species. The other three species, S. curvata, S. mayri, and S. pergandei are larger (total length usually over 3 mm) and are found in Central America and South America. Simopelta mayri (Colombia) is larger (total length greater than 4 mm) and dark brown. Simopelta curvata (SE Brasil) is smaller (TL 3.5 mm) and has four mandibular teeth. Simopelta pergandei (Central and northern South America) is smaller (TL ~ 3 mm), medium brown, and has three mandibular teeth.