Key to Stegomyrmex

This worker and queen key is based on: Feitosa, R. M., C. R. F. Brandão and J. L. M. Diniz. 2008. Revisionary studies on the enigmatic Neotropical ant genus Stegomyrmex Emery, 1912 (Hymenoptera: Formicidae: Myrmicinae), with the description of two new species. Journal of Hymenoptera Research. 17(1):64-82.

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Stegomyrmex

1

• Integument of mesosoma predominantly smooth and shining; body covered mainly by sparse aggregations of somewhat curved and multibranched hairs; metapropodeal groove deeply impressed; petiole without anteroventral spines (state of Para, Brazil) . . . . . Stegomyrmex bensoni

• Integument of mesosoma predominantly sculptured, areolate; body covered mainly by sparse and erect clavate setae; metapropodeal groove only moderately impressed; petiole with at least one anteroventral spine . . . . . 2

2

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• Petiole with two anteroventral spines; inferior margin of pronotum with a row of filiform hairs; known only from the gyne (Peru and Bolivia) . . . . . Stegomyrmex connectens

• Petiole with a single anteroventral spine; inferior margin of pronotum with a row of plumose hairs . . . . . 3

3

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• Promesonotum much higher than propodeum, in lateral view; propodeal spines blunt and directed posteriorly; in dorsal view propodeal spiracles strongly projected laterally (Costa Rica, Panama and Colombia) . . . . . Stegomyrmex manni

• Promesonotum slightly higher than propodeum, in lateral view; propodeal spines subtriangular, acute and directed upwards; in dorsal view propodeal spiracles not strongly projected laterally . . . . . 4

4

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• Mesosoma length ≥ 1.59 mm; mesosoma partially sculptured, with foveae sparsely set on the polished integument; metapropodeal impression without a projecting tubercle; nucal area predominantly smooth; in dorsal view basal face of propodeum relatively narrow (northern Argentina, Paraguay and southeastern Brazil) . . . . . Stegomyrmex vizottoi

• Mesosoma length ≤ 1.59 mm); mesosoma strongly sculptured, with the integument completely areolate; metapropodeal impression with a projecting tubercle; nucal area predominantly sculptured; in dorsal view basal face of propodeum relatively broad (central-north Brazil) . . . . . Stegomyrmex olindae