Key to Proceratium micrommatum clade

This worker key is based on: *[[Media:Fernandes, I.O., Delabie, J.H.C. et al. 2019. Contribution to the knowledge of the genus Proceratium.pdf|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]].

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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 * Proceratium
 * Proceratium Species Clades

1

 * Spur of the mid tibia not pectinate . . . . . 2
 * Spur of the mid tibia pectinate . . . . . 11

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
 * Small species TL:< 2.90 . . . . . Proceratium colombicum (Colombia: Nariño)
 * Large species TL:> 3.20 . . . . . 5

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
 * TL: ≥3.80 mm. WL: ≥1.05 mm . . . . . Proceratium panamense (Costa Rica to Venezuela)
 * TL: <3.60 mm. WL: ≤0.95 mm . . . . . Proceratium micrommatum (USA to Peru)

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)