Key to Temnothorax tricarinatus species group workers

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This worker key is based on: Mackay, W. P. 2000. A review of the New World ants of the subgenus Myrafant, (genus Leptothorax) (Hymenoptera: Formicidae). Sociobiology. 36:265-444.

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  • Top of pronotum smooth and glossy; dorsum of head smooth and glossy . . . . . 2
  • Top of pronotum partially or completely sculptured; dorsum of head usually sculptured . . . . . 4

2

return to couplet #1

  • Carina present on pronotum, which forms transverse ridge across anterior border . . . . . Temnothorax schmittii
Temnothorax schmittii casent0172996 h 1 high.jpg
Temnothorax schmittii casent0172996 p 1 high.jpg
  • Carina not forming transverse ridge across pronotum . . . . . 3

3

return to couplet #2

  • Propodeal armature of worker represented only as bumps; propodeal spines of female with blunt tips; node of petiole of male low and weakly concave posteriorly . . . . . Temnothorax brevispinosus
Temnothorax brevispinosus casent0911187 h 1 high.jpg
Temnothorax brevispinosus casent0911187 p 1 high.jpg
  • Propodeal armature of worker poorly developed angles; propodeal spines of female with acute tips; node of petiole of male higher and somewhat concave posteriorly . . . . . Temnothorax mexicanus

4

return to couplet #1

  • Propodeal armature consisting of small angles which are less than 1/3 distance between bases . . . . . 5
  • Propodeal armature consisting of definite spines, that are usually at least 1/3 as long as distance between bases . . . . . 16

5

return to couplet #4

  • Eyes relatively small, greatest length less than distance from anterior border of eye to base of mandible; dorsum of head with rugae, or densely punctate . . . . . 6
  • Eyes larger, maximum diameter nearly equal to distance between eye and insertion of antenna; dorsum of head with fine striae, or partly smooth and polished . . . . . 9

6

return to couplet #5

Temnothorax coleenae casent0172988 head 1.jpg
Temnothorax coleenae casent0172988 profile 1.jpg

7

return to couplet #6

  • Postpetiole widened, about 1.5 X or more width of petiole . . . . . 8
  • Postpetiole not noticeably widened as seen from above, about 1.25 X width of petiole . . . . . Temnothorax stenotyle
Temnothorax stenotyle casent0102844 head 1.jpg
Temnothorax stenotyle casent0102844 profile 1.jpg

8

return to couplet #7

  • Rugae on dorsum of head coarse; propodeal spines small, but developed; distributed in much of USA south into northern Mexico . . . . . Temnothorax tricarinatus
Temnothorax tricarinatus casent0102845 head 1.jpg
Temnothorax tricarinatus casent0102845 profile 1.jpg
  • Sculpture of head fine, consisting of rugulae; propodeal armature consisting of small angles; Hidalgo . . . . . Temnothorax rugithorax

9

return to couplet #5

  • Much of dorsum of head, especially posterior half, smooth and glossy . . . . . 10
  • Entire head, except for central area, covered with fine striae . . . . . 12

10

return to couplet #9

  • Propodeal armature consisting of blunt angles; pale brown or yellow, or dark brown; New Mexico, Texas, and Chihuahua . . . . . 11
Temnothorax punctithorax casent0007122 h 1 high.jpg
Temnothorax punctithorax casent0007122 p 1 high.jpg

11

return to couplet #10

Temnothorax cokendolpheri casent0103162 head 1.jpg
Temnothorax cokendolpheri casent0103162 profile 1.jpg
Temnothorax adustus casent0105862 head 1.jpg
Temnothorax adustus casent0105862 profile 1.jpg

12

return to couplet #9

  • Hairs on scape raised above surface, may be semierect . . . . . 13

13

return to couplet #12

Temnothorax chandleri casent0005688 head 1.jpg
Temnothorax chandleri casent0005688 profile 1.jpg
  • Node of petiole blunt and rounded as seen in profile; southwestern United States and Mexico . . . . . 14

14

return to couplet #13

  • Node of petiole relatively high, height above posterior peduncle nearly equal to thickness of petiole at same point; southwestern US and northern Mexico (Chihuahua) . . . . . Temnothorax carinatus
Temnothorax carinatus casent0104817 head 1.jpg
Temnothorax carinatus casent0104817 profile 1.jpg
  • Node of petiole lower, height above posterior peduncle about half thickness of petiole at same point; Michoacan . . . . . Temnothorax rugulosus

15

return to couplet #12

  • Pale brown or yellow; subpeduncular process well developed; central Colorado and Wyoming . . . . . Temnothorax furunculus
Temnothorax furunculus casent0172592 head 1.jpg
Temnothorax furunculus casent0172592 profile 1.jpg
  • Dark brown; subpeduncular process consisting of small bump southeastern Arizona, southern New Mexico, western Texas . . . . . Temnothorax neomexicanus
Temnothorax neomexicanus casent0102839 head 1.jpg
Temnothorax neomexicanus casent0102839 profile 1.jpg

16

return to couplet #4

Temnothorax obliquicanthus casent0102841 head 1.jpg
Temnothorax obliquicanthus casent0102841 profile 1.jpg


  • Eye not kidney shaped; first gastral tergum smooth and shining . . . . . 17

17

return to couplet #16

Temnothorax-texanus-MCZ001H.jpg
Temnothorax-texanus-MCZ001L.jpg


  • Dorsum of postpetiole covered with punctures, if any rugae are present, they are fine and form reticulations with punctures . . . . . 18

18

return to couplet #17

  • Postpetiole wide, at least half width of gaster; eastern USA . . . . . Temnothorax davisi = Temnothorax texanus
Temnothorax-texanus-MCZ001H.jpg
Temnothorax-texanus-MCZ001L.jpg
  • Postpetiole not greatly widened, much narrower than half width of gaster; western USA . . . . . 19

19

return to couplet #18

Temnothorax neomexicanus casent0102839 head 1.jpg
Temnothorax neomexicanus casent0102839 profile 1.jpg
  • Entire head punctate or striolate, very weakly shining . . . . . 20

20

return to couplet #19

Temnothorax-nevadensis-MCZ001H.jpg
Temnothorax-nevadensis-MCZ001L.jpg
  • Propodeal spines slightly bend downwards; nests in plant cavities . . . . . Temnothorax gallae
Temnothorax gallae casent0005684 head 1.jpg
Temnothorax gallae casent0005684 profile 1.jpg