Key to Cylindromyrmex Species

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This queen and worker key is based on: Brown, W. L., Jr. 1975. Contributions toward a reclassification of the Formicidae. V. Ponerinae, tribes Platythyreini, Cerapachyini, Cylindromyrmecini, Acanthostichini, and Aenictogitini. Search Agric. (Ithaca N. Y.) 5(1):1-115.

Brown stated: "I offer a modification of Wheeler's key of 1937:444-445. Users should be warned that the measurements as given may be imprecise, especially those derived from Wheeler's own descriptions. Most will be under measurements, and the smaller the absolute dimensions of the insect, the greater the error is likely to be."

This key does not include Cylindromyrmex escobari

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Cylindromyrmex

1

2

return to couplet #1

  • Eyes small and flat; at least the first gastric (IV true) abdominal segment partly longitudinally striate . . . . . 3
  • Eyes large and convex; gastric terga smooth . . . . . 6

3

return to couplet #2

Cylindromyrmex longiceps casent0915330 p 1 high.jpg
Cylindromyrmex longiceps casent0915330 d 2 high.jpg
  • Head not more than IV, times as long as broad; mandibles dentate . . . . . 4

4

return to couplet #3

Cylindromyrmex meinerti casent0010788 profile 1.jpg

5

return to couplet #4

  • Body brownish red, head and gaster dark brown or black; mandibles with about 6 teeth; eyes very small, with about 30 or less indistinct facets; “length 4.5 mm.” . . . . . Cylindromyrmex brevitarsus
Cylindromyrmex-brevitarsus-w-lateralMontage.jpg
  • Body black or very dark brown; mandibles larger, with about 10 teeth or crenulations; eyes larger, with > 50 facets; TL 6-7 mm (Cuba) . . . . . Cylindromyrmex darlingtoni
Cylindromyrmex-darlingtoni-w-lateralMontage.jpg

6

return to couplet #2

Cylindromyrmex whymperi casent0006105 profile 1.jpg
  • Eyes situated distinctly behind middle of sides of head . . . . . 7

7

return to couplet #6

  • Coxae, femora, and tibiae uniform ferruginous yellow, tarsi sometimes slightly darker ferruginous (S Brasil; Paraguay, Venezuela) . . . . . Cylindromyrmex brasiliensis
Cylindromyrmex brasiliensis casent0173502 profile 1.jpg
Cylindromyrmex striatus casent0106074 profile 1.jpg
Cylindromyrmex-whymperi-w-lateralMontage.jpg

8

return to couplet #1

9

return to couplet #8

  • Femora yellow; fore tibiae more than twice as long as broad; wings brownish; TL about 10 mm (Bolivia, Columbia, Peru, Venezuela, ) . . . . . Cylindromyrmex boliviae
  • Femora “reddish black,” fore tibiae scarcely twice as long as broad; wings violaceous; “length 12.5 mm” . . . . . Cylindromyrmex godmani

10

return to couplet #8

  • At least the first gastric (IV true abdominal) segment more or less striate . . . . . 11

11

return to couplet #10

  • Gastric striation limited to base of first tergum (IV true abdominal segment); mandibles with about 10 teeth; “length 7.5-8 mm” (Cuba) . . . . . Cylindromyrmex darlingtoni
  • Tergum of first gastric segment (at least) entirely striate . . . . . 12

12

return to couplet #11

  • Mandibles 7-toothed; tergum of second gastric (V true abdominal) segment entirely striate, third segment at least partly striate; wings grayish hyaline with infuscated tips . . . . . Cylindromyrmex meinerti
  • Mandibles indistinctly dentate; tergum of second gastric segment striate only in the middle, third segment smooth; wings uniformly infuscated; “length 9.5 mm” . . . . . Cylindromyrmex whymperi