Key to Crematogaster kelleri group workers

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This worker key is based on: Blaimer, B.B. & Fisher, B.L. 2013. How much variation can one ant species hold? Species delimitation in the Crematogaster kelleri-group in Madagascar. PLoS ONE 8(7): e68082. doi:10.1371/journal.pone.0068082

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1

  • Postpetiole clearly bisected by a complete, deep, longitudinal median impression (Figs 5, 6) . . . . . 2
Fig 5. Postpetiole with a complete, deep, longitudinal median impression C. madagascariensis
Fig 6 Postpetiole with median stripe on complete median impression C. hazolava
  • Postpetiole with shallow median impression anteriorly, more pronounced posteriorly (Figs 7, 8) . . . . . Crematogaster kelleri
Fig 7 Postpetiole with shallow median impression C. kelleri
Fig 8 Postpetiole with shallow median impression C. kelleri

2

return to couplet #1

  • Propodeal spiracle mostly confluent with base of propodeal spines (Fig. 9); propodeal spines short (SPI 0.07–0.15) . . . . . 3
Fig 9 Propodeal spiracle confluent with base of propodeal spines C. hazolava
Fig 10 Propodeal spiracle situated below base of propodeal spines C. tavaratra
  • Propodeal spiracle situated below base of propodeal spines (Fig. 10); propodeal spines medium length (SPI 0.17–0.24); far northern Madagascar . . . . . Crematogaster tavaratra

3

return to couplet #2

  • Postpetiole evenly colored (as in Fig. 5, 7, 8), body color other than yellow . . . . . 4
Fig 5 Postpetiole with a complete, deep, longitudinal median impression C. madagascariensis
Fig 7 Postpetiole with median stripe on complete median impression C. hazolava
Fig 8 Species-key to the C. kelleri-group. Postpetiole with shallow median impression C. kelleri
  • Postpetiole with ‘‘median stripe’’: longitudinal impression lighter colored than lobes (as in Fig. 6), or body color yellow (in this case median stripe present, but hard to see) . . . . . Crematogaster hazolava
Fig 6 Postpetiole with median stripe on complete median impression C. hazolava

4

return to couplet #3

  • Very small species (HW 0.68–0.72, WL 0.73–0.74); posterior head margin rounded; color dirty yellow; known only from Montagne d’Ambre massif . . . . . Crematogaster hafahafa
  • Medium to large species (HW 0.86–1.11, WL 0.92–1.16); posterior head margin usually with subangular corners, color brown or dark brown . . . . . Crematogaster madagascariensis