Key to Brachymyrmex with tumuliform metathoracic spiracles

This worker key is based on: [[Media:Ortiz, C.M. & Fernández, F. 2014. Brachymyrmex species with tumuliform metathoracic spiracles.pdf|Ortiz, C.M. & Fernández, F. 2014. Brachymyrmex species with tumuliform metathoracic spiracles description of three new species and discussion of dimorphism in the genus (Hymenoptera, Formicidae). ZooKeys 371, 13-33.]] You may also be interested in

Brachymyrmex

tumuliform metathoracic spiracles = spiracles that are fully dorsal and highly elevated on the meso-metanotum in lateral view

This group contains the two dimorphic Brachymyrmex species and three monomorphic species. All five species are found only in Brazil.

1

 * Clypeus with a single long apical hair near to the anterior margin, two lateral hairs medially and two hairs near the toruli; monomorphic . . . . . 2


 * Clypeus with a continuous row of long thick hairs near the anterior margin, and remaining pilosity not arranged as above; dimorphic . . . . . 4

2
return to couplet #1
 * Toruli surpassing the posterior clypeal margin (best observed in anterodorsal oblique view); entire body smooth and shiny . . . . . 3


 * Toruli touching the posterior clypeal margin but never surpassing it (best observed in anterodorsal oblique view); head and mesosoma finely punctate and opaque; gaster smooth and shiny . . . . . Brachymyrmex brasiliensis

3
return to couplet #2
 * Mesosoma without erect hairs; first gastral segment with dense yel¬lowish pubescence . . . . . Brachymyrmex feitosai


 * Mesosoma with two erect hairs on pronotum and two on mesonotum; gaster without pubescence . . . . . Brachymyrmex delabiei

4
return to couplet #1
 * Mesosoma mostly smooth and shiny, except for longitudinal striations re¬stricted to the metapleura; body entirely light brown . . . . . Brachymyrmex micromegas


 * Mesosoma with fine longitudinal striations all over; gaster darker than the rest of body . . . . . Brachymyrmex pilipes