Key to Rogeria Species

The following key to Rogeria workers is based on Kugler, C. 1994. A revision of the ant genus Rogeria with description of the sting apparatus (Hymenoptera: Formicidae). Journal of Hymenoptera Research. 3: 17-89.

The figures given in the key refer to line drawings. When figures are included with a couplet that ends with a species name, the line drawings can be found on the respective Antwiki species page.

1

 * Pilosity appressed on mesosoma dorsum and gaster T1. A very small number of short decumbent hairs may also be present . . . . . 2


 * Erect, suberect, or subdecumbent hairs present on mesosoma or gaster T1, often in addition to appressed or decumbent pilosity . . . . . 4

2
return to couplet #1


 * Body of clypeus strongly projecting over apron. Basal angle of mandibles very reduced. (amazonian Brazil) (Fig. 14) . . . . . Rogeria prominula


 * Body of clypeus at most projecting only slightly over apron. Mandibles triangular . . . . . 3

3
return to couplet #2


 * Clypeal apron emarginate. Mandible with 5 teeth. (Paraguay, Argentina) (Fig. 82) . . . . . Rogeria bruchi

4
return to couplet #1


 * Very dense, flexuous, erect hairs on dorsa of head, mesosoma and gaster; no decumbent or appressed pilosity. Promesonotum uniformly and densely areolate . . . . . 5


 * Erect hair not so dense or flexuous. Decumbent hair present. Promesonotum may have some rugae or carinae . . . . . 7

5
return to couplet #4


 * Metanotum forms an abrupt declivity between promesonotum and propodeum. (lowland Colombia, Ecuador) (Figs. 5-6) . . . . . Rogeria gibba


 * Shallow metanotal groove hardly interrupts mesosoma profile . . . . . 6

6
return to couplet #5


 * Petiolar node relatively short and tall. Gaster larger (GW /WL 0.94-0.97). (lowland Ecuador, Venezuela) (Figs. 2-4) . . . . . Rogeria ciliosa

7
return to couplet #4


 * Ventral process of petiolar peduncle reduced to a small step in petiolar profile, or absent . . . . . 8


 * Ventral process of petiolar peduncle dentate . . . . . 10

8
return to couplet #7


 * Propodeal spines longer (PSI 0.17-0.20). Ventral process of petiolar peduncle present as a small step. (Paraguay, Peru, Colombia) (Figs. 15-16) . . . . . Rogeria besucheti


 * Propodeal spines shorter (PSI 0.07-0.13). Petiolar peduncle lacking a ventral process . . . . . 9

9
return to couplet #8


 * WL 0.72-0.92mm. (Pacific Islands) (Figs. 7-12) . . . . . Rogeria stigmatica

10
return to couplet #7


 * WL 1.28-1.53mm. Eye large (80-100 facets). Postpetiole with an inconspicuous sternum. (Guyana, amazonian Brazil) (Fig. 18) . . . . . Rogeria procera


 * WL and eyes usually much smaller. If WL and eyes nearly as large, then postpetiolar sternum conspicuous . . . . . 11