Key to Mesostruma of the southwestern Australian Botanical Province

This worker key is based on: [[Media:Heterick 2009.pdf|Heterick, B. E. 2009a. A guide to the ants of South-western Australia. Records of the Western Australian Museum, Supplement 76: 1-206. Part 2.]]

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 * Australia
 * SWBP
 * Mesostruma

1

 * Propodeum armed with long spines . . . . . Mesostruma spinosa


 * Propodeum armed with short spines or denticles, or with lamellae . . . . . 2

2
return to couplet #1
 * Seen dorsally, humeral angles of promesonotum armed with short spines, or, at least, distinct denticles . . . . . 3


 * Seen dorsally, humeral angles of promesonotum rounded . . . . . 4

3
return to couplet #2
 * Propodeal lamellae well-developed; postpetiole with lateral flanges (Figure 596) . . . . . Mesostruma laevigata


 * Propodeum with short denticles; postpetiole without lateral flanges (Figure 597) . . . . . Mesostruma eccentrica

4
return to couplet #2
 * Dorsum of mesosoma with dense, almost confluent shallow punctures with cuticular sculpture between punctures (Figure 598) . . . . . Mesostruma inornata


 * Dorsum of mesosoma with scattered, well-separated punctures; cuticle between punctures smooth and unsculptured (Figure 599) . . . . . Mesostruma loweryi