Key to Trachymyrmex iheringi species group workers

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This worker key is based on: Mayhé-Nunes, A. J. and Brandão, C. R. F. 2005. Revisionary studies on the attine ant genus Trachymyrmex Forel. Part 2: the Iheringi group (Hymenoptera: Formicidae). Sociobiology. 45(2):271-305.

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1

  • Basal lobe of the antennal scape not enlarged transversely nor very prominent basally or dorsally, its anterior face forming an obtuse angle with the superior face of the slender base of the scape . . . . . Mycetomoellerius pruinosus
Trachymyrmex pruinosus usnment00445506 h 1 high.jpg
Trachymyrmex pruinosus usnment00445506 p 1 high.jpg
  • Basal lobe of the antennal scape usually (not always) wider than the maximum width of the scape and enlarged transversely, distinctly high and obliquely projected on the slender base of the scape, with which forms an acute angle in lateral view 2) . . . . . 2

2

return to couplet #1

  • Subtriangular frontal lobes rather backwards directed, laterally subdentate; mesopleurae practically without hairs, especially in the anepisternum . . . . . 3
  • Subquadrate or subtriangular frontal lobes rather forwards directed without lateral teeth: mesopleurae covered with hairs . . . . . 4

3

return to couplet #2

  • Basal lobe of the antennal scape prolonged towards the head's middle, when the scape is lodged in the scrobe; pronotal dorsum, between the anterior border and the lateral and medium projections, practically without hairs or pilig rous tubercles: decumbent hairs strongly curved in the base, relatively scarce in the tergum I of gaster . . . . . Mycetomoellerius holmgreni
Trachymyrmex holmgreni casent0178106 head 1.jpg
Trachymyrmex holmgreni casent0178106 profile 1.jpg
  • Basal lobe of the antennal scape more or less rounded, without marked tip; pronotal dorsum, between the anterior border and the lateral and median projections, with at least some hairs or piligerous tubercles along the sagital line; hairs evenly curved more frequent in the tergum I of gaster . . . . . Mycetomoellerius tucumanus
Trachymyrmex tucumanus casent0909391 h 1 high.jpg
Trachymyrmex tucumanus casent0909391 p 1 high.jpg

4

return to couplet #2

  • Alitrunk covered with evenly short and strongly curved hairs; lateral margin in the tergum I of gaster strongly marked . . . . . Trachymyrmex cirratus
Trachymyrmex cirratus H.jpg
Trachymyrmex cirratus P.jpg
  • Alitrunk with hairs of uneven length, the longer (notably in the mesonotum) not strongly curved in the apex; lateral margin in the tergum I of gaster weakly marked . . . . . 5

5

return to couplet #4

  • Discal area of the mandibles completely sculptured and subopaque; tergum I of gaster with two types of hairs, some s lightly curved, and at least some other strongly curved in the apex; sternum I of gaster with short hairs strongly curved in the apex . . . . . Mycetomoellerius iheringi
Trachymyrmex iheringi casent0904991 h 1 high.jpg
Trachymyrmex iheringi casent0904991 p 1 high.jpg
  • Discal area of the mandibles smooth and shining; tergum r of gaster with long hairs only, more or less sloping and not curved apically; sternum I of gaster without short hairs strongly curved . . . . . Mycetomoellerius kempfi
Trachymyrmex kempfi casent0178107 head 1.jpg
Trachymyrmex kempfi casent0178107 profile 1.jpg