Key to Proceratium micrommatum clade

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This worker key is based on: *Fernandes, I.O., Delabie, J.H.C., Fernández, F. 2019. Contribution to the knowledge of the genus Proceratium Roger (Hymenoptera: Formicidae: Proceratiinae) in the New World. Sociobiology 66(4): 551-559 (doi:10.13102/sociobiology.v66i4.4484).

As modified from Baroni Urbani & de Andrade, 2003. The fossil species Proceratium dominicanum and Proceratium poinari, as well as Proceratium longiscapus known from the gyne only, are excluded from this key.

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1

2

return to couplet #1

  • Dorsal part of propodeum with a tumulus covered only with short hairs . . . . . 3
  • Dorsal part of propodeum without a tumulus, covered with long and short hairs . . . . . 7

3

return to couplet #2

  • Gaster completely sculptured . . . . . 4
  • Sculpture present only in the midle or less on the gaster . . . . . 6

4

return to couplet #3

5

return to couplet #4

  • Head, mesosoma and gaster reticulate-faveolate and granulate; tumulus on the propodeum broad and low . . . . . Proceratium ecuadoriense (Ecuador)
  • Head mesosoma and gaster densely faveolate; tumulus on the propodeum narrow and high . . . . . Proceratium amazonicum (Brazil: Rondônia)

6

return to couplet #3

  • Petiole 1/5 longer than broad. Postpetiole shorter than 1/2 of the gastral tergite I; postpetiole and gaster more convex . . . . . Proceratium catio (Venezuela, Colombia and Ecuador)
  • Petiole at most 1/8 longer than broad. Postpetiole slightly longer than 1/2 of the gastral tergite I; postpetiole and gaster less convex . . . . . Proceratium brasiliense (Colombia and Brazil)

7

return to couplet #2

  • Mid basitarsi with hairs shorter than 1/2 of the basitarsal length . . . . . Proceratium taino (Dominican Republic)
  • Mid basitarsi with at least one hair about 1/2 of the mid basitarsal length . . . . . 8

8

return to couplet #7

  • Area between the basal and declivous faces of the propodeum with a transverse carina angulate or denticulate laterally . . . . . Proceratium mexicanum (Southern USA to Guatemala)
  • Area between the basal and declivous faces of the propodeum with at most very superficial traces of transverse carina . . . . . 9

9

return to couplet #9

  • Mesosoma gently convex in profile. Postpetiole in dorsal view more convex and slightly angulate anterolaterally. Integumental sculpture impressed . . . . . Proceratium convexiceps (Mexico to Ecuador)
  • Mesosoma more elongate in profile. Postpetiole in dorsal view more rectangular and angulate anterolaterally. Body sculpture more superficial . . . . . 10

10

return to couplet #9

11

return to couplet #1

  • Clypeus surrounding the antennal sockets, subrectangular and protruding anteriorly. Propodeal dorsum with a median swelling . . . . . Proceratium transitionis (Colombia)
  • Clypeus not surrounding the antennal sockets, reduced medially and triangular. Propodeal dorsum without swelling . . . . . Proceratium lattkei (Venezuela)