Key to Veromessor species

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Key to Veromessor species based on workers.

1

  • Propodeal spines long, much longer than the distance separating their bases => 2
  • Propodeal spines short, not longer than the distance separating their bases => 6

2

Messor andrei casent0005728 head 1.jpg
Messor andrei casent0005728 profile 1.jpg
  • Psammophore present => 3

3

  • Base of antennal scape only slightly expanded and similar in size and shape to narrowest scape diameter (Mexico only) => 4
  • Base of antennal scape expanded and flattened, much broader than the narrowest scape diameter and differing in shape => 5

4

  • Body strongly bicolored, head and mesosoma yellow-red, contrasting with reddish-black gaster; petiolar node in side view with the anterior face separated from the dorsal surface by an angle; propodeal spines raising above the dorsal surface of the propodeum at an angle of approximately 45° => Veromessor julianus clarior, Veromessor julianus manni
  • Body uniform in color or nearly so, the reddish-black mesosoma only slightly lighter in color than the dark reddish-black head and gaster; petiolar node broadly rounded dorsally, the anterior face merging gradually into the dorsal face; propodeal spines raising above the dorsal surface of the propodeum at an angle less than approximately 30° => Veromessor julianus
Messor julianus casent0104782 head 1.jpg
Messor julianus casent0104782 profile 1.jpg

5

  • Base of antennal scape flattened symmetrically with both the inner and lateral surfaces similar in size and shape => Veromessor lobognathus
Messor-lobognathus-head.jpg
Messor-lobognathus-side.jpg
  • Base of antennal scape with a large lobe medially and an elongate tooth-like flange laterally, the base highly asymmetrical => Veromessor chamberlini
Messor chamberlini casent0005730 head 1.jpg
Messor chamberlini casent0005730 profile 1.jpg

6

  • Psammophore absent => 7
  • Psammophore present => 8

7

  • Base of antennal scape flattened and with the outer surface drawn forward well beyond the inner surface, so that the base of the scape is asymmetrical; pronotum and mesonotum (in dorsal view) with similar sculpturing => Veromessor chicoensis
Messor chicoensis casent0005731 h 1 high.jpg
Messor chicoensis casent0005731 p 1 high.jpg
  • Base of antennal scape flattened but symmetrically, so that the inner and outer surfaces are similar in shape and size; mesonotum smooth or nearly so, sculpturing distinctly weaker than dorsum of pronotum => Veromessor stoddardi
Messor stoddardi casent0005735 head 1.jpg
Messor stoddardi casent0005735 profile 1.jpg

8

  • Base of antennal scape expanded and flattened, much broader than the narrowest scape diameter and differing in shape => Veromessor smithi
  • Base of antennal scape only slightly expanded and similar in size and shape to narrowest scape diameter => 9
Messor-smithi-MCZ001H.jpg
Messor-smithi-MCZ001L.jpg

9

Messor lariversi casent0005732 head 1.jpg
Messor lariversi casent0005732 profile 1.jpg
Messor pergandei casent0005733 head 1.jpg
Messor pergandei casent0005733 profile 1.jpg