Key to Neotropical Probolomyrmex

This key to workers and queens is from: Oliveira, A.M., Feitosa, R.M. 2019. Taxonomic revision of the genus Probolomyrmex Mayr, 1901 (Hymenoptera: Formicidae: Proceratiinae) for the Neotropical Region. Zootaxa 4614 (1): 61–94 (doi:10.11646/zootaxa.4614.1.3).

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Probolomyrmex

1

• Prora absent (Fig. 1A) . . . . . 2

• Prora present (Fig. 1B - pr) . . . . . 3

2

return to couplet #1

• Ventral profile of the petiole with a subrectangular anterior projection. Guatemala, Mexico, and Panama (Fig. 2A - sp) . . . . . Probolomyrmex petiolatus

• Ventral profile of the petiole without a subrectangular anterior projection. Argentina and Brazil (GO, MS, MT, RO, and TO) (Fig. 2B - sp) . . . . . Probolomyrmex brujitae

3

return to couplet #1

• In lateral view, dorsal and posterior margins of propodeum meeting in a rounded angle, without any acute projection. Brazil (PA) (Fig. 3A - pd) . . . . . Probolomyrmex lamellatus.

• In lateral view, dorsal and posterior margins of propodeum meeting in an acute angle, forming distinct teeth. . . . . . 4

4

return to couplet #3

• In lateral view petiole higher than long (Fig. 4A). In dorsal view petiolar teeth well developed. Brazil (PA, RO and TO) . . . . . Probolomyrmex dentinodis.

• In lateral view petiole longer than high (Fig. 4B). In dorsal view petiolar teeth absent or weakly developed (Fig. 21C) . . . . . 5

5

return to couplet #4

• In lateral view, the highest point of the dorsal profile of the first gastral tergite is at the posterior limit of the tergite. Nicaragua(Fig. 5A) . . . . . Probolomyrmex cegua

• In lateral view, the highest point of the dorsal profile of the first gastral tergite is anterior to the posterior limit of the tergite. (Fig. 5B - ppd) . . . . . 6

6

return to couplet #5

• Antennal scapes relatively longer, distance from scape apex to posterior margin of head less than or equal to two times the pedicel length. Brazil (AC and RO); Bolivia, Colombia, Costa Rica, Honduras, Panama, and Peru (Fig. 6A) . . . . . Probolomyrmex boliviensis

• Antennal scapes relatively shorter, distance of scape apex to posterior margin greater than two times the pedicel length (Fig. 6B) . . . . . 7

7

return to couplet #6

• Subpetiolar process well developed, medially concave ventrally to subrectangular, with an acute postero-ventral corner. Guyana, Peru, and Venezuela (Fig. 7A - sp) . . . . . Probolomyrmex kelleri

• Subpetiolar process weakly developed. Costa Rica (Figs. 7B - sp) . . . . . Probolomyrmex guanacastensis