Key to Crematogaster kelleri group workers

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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 * Crematogaster 
 * Ants of Madagascar

1

 * Postpetiole clearly bisected by a complete, deep, longitudinal median impression (Figs 5, 6) . . . . . 2


 * Postpetiole with shallow median impression anteriorly, more pronounced posteriorly (Figs 7, 8) . . . . . Crematogaster 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


 * 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


 * 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

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