Key to Palaearctic Proceratium Species

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The following key to workers is based on Baroni Urbani, C., de Andrade, M.L. (2003) The ant genus Proceratium in the extant and fossil record (Hymenoptera: Formicidae). Museo Regionale di Scienze Naturali, Monografie, 36, 1–492.

The species Proceratium longmenense and Proceratium zhaoi occur in this region but are not included in this key.


1

  • Lower mesopleura entirely inflated. Petiole and postpetiole with a posterodorsal transparent blister under the integument. Israel . . . . . Proceratium galilaeum
  • Lower mesopleura not inflated. Petiole and postpetiole without a posterodorsal transparent blister under the integument . . . . . 2

2

return to couplet #1

  • Petiole without neck and rectangular. Anterior clypeal border straight. First gastral tergite with a transparent macula close to the posterior border. Palp formula 2,2 . . . . . 3
  • Petiole convex. Anterior clypeal border medially rectangular or triangular. First gastral tergite without transparent macula. Palp formula 4,3, 3,3 or 3,2 . . . . . 4

3

return to couplet #2

  • Postpetiole very sparsely granulopunctate. TL 3.03-3.29 mm and petiolar width 0.27-0.29 mm. Tunisia, Algeria, Cyprus, Turkey and Albania . . . . . Proceratium numidicum
Head of Proceratium numidicum worker
Lateral view of Proceratium numidicum worker
  • Postpetiole strongly granulopunctate TL 2.84-3.32 mm and petiolar width 0.30-0.35 mm. Japan, Taiwan . . . . . Proceratium japonicum
Head of Proceratium japonicum worker
Lateral view of Proceratium japonicum worker

4

return to couplet #2

  • Propodeal suture well marked. First funicular joint about 1/2 longer than broad. Pakistan . . . . . Proceratium confinium
  • Propodeal suture absent. First funicular joint at most 1/3 longer than broad . . . . . 5

5

return to couplet #4

  • Clypeus medially strongly protruding anteriorly and rectangular . . . . . 6
  • Clypeus medially protruding anteriorly but triangular . . . . . 8

6

return to couplet #5

  • Propodeal lamellae absent. Head only weakly convex posteriorly. Integumental sculpture superficial. Malta and Sicily . . . . . Proceratium melitense
  • Propodeal lamellae well developed. Head convex posteriorly. Integumental sculpture well marked . . . . . 7

7

return to couplet #6

  • Mesosoma, petiole and postpetiole with deep sculpture. Body dark ferrugineous. Japan, Korea, Korea?, China? . . . . . Proceratium watasei
  • Mesosoma, petiole and postpetiole with superficial sculpture. Colour light brown. Italy, Croatia, Greece, Algeria, Morocco and Tunisia . . . . . Proceratium algiricum

8

return to couplet #5

  • Fore tibiae without basal spine. Second tarsomere of hind legs shorter than pretarsus. First gastral sternite protruding over the postpetiolar sternite. Japan, Korea?, China? . . . . . Proceratium itoi
Head of Proceratium itoi worker
Lateral view of Proceratium itoi worker
  • Fore tibiae with basal spine. Second tarsomere of hind legs at least as long as the pretarsus. First gastral sternite not protruding over the postpetiolar sternite . . . . . 9

9

return to couplet #8

  • Head granulate-punctate. Petiole slightly longer than broad. Second tarsomere of hind legs about as long as the pretarsus. Japan . . . . . Proceratium morisitai
Head of Proceratium morisitai worker
Lateral view of Proceratium morisitai worker
  • Head reticulate-punctate. Petiole about as broad as long. Second tarsomere of hind legs about 1/5 longer than the pretarsus. Czech Republic, Hungary, Ukraine, Yugoslavia, Italy, Romania, Bulgaria, Albania, Greece, Turkey, Spain . . . . . Proceratium melinum
Head of Proceratium melinum worker
Lateral view of Proceratium melinum worker