Key to Linepithema of Columbia

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This worker key is based on: Escarraga, M., Guerrero, R.J. 2016. The ant genus Linepithema (Formicidae Dolichoderinae) in Colombia. Zootaxa 4208: 446–458 (DOI 10.11646/zootaxa.4208.5.3).

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1

  • Anterior portion of the metapleural gland orifice with moderate to abundant appressed hairs (sometimes individuals must be observed in dorsal-oblique position) . . . . . 2
  • Anterior portion of the metapleural gland orifice lacking pubescence, or with a few scattered appressed hairs . . . . . . 4

2

return to couplet #1

  • Pronotum with one pair of erect setae (may be lost); maxillary palps long, more than half of HL; metanotal groove slightly or not impressed; propodeum low and rounded . . . . . Linepithema neotropicum
Linepithema neotropicum casent0104903 head 1.jpg
Linepithema neotropicum casent0104903 profile 1.jpg
  • Pronotum usually without erect setae, rarely with one pair; length of maxillary palps half or less than HL; metanotal groove slightly to moderately impressed; propodeum inclined anteriorly, with dorsal and posterior face forming an obtuse angle. . . . . . 3

3

return to couplet #2

  • Antennal scapes relatively short, usually less than HL; pronotum and first gastric tergite bearing setae (sometimes may be lost); mesonotum angular, with a posterior declivous face and sometimes swollen . . . . . Linepithema gallardoi
Linepithema gallardoi casent0106981 head 1.jpg
Linepithema gallardoi casent0106981 profile 1.jpg
  • Antennal scapes long, equal or longer than HL; pronotum and first gastric tergite without setae; mesonotum straight, not angular or swollen . . . . . Linepithema humile
Linepithema humile casent0005323 head 1.jpg
Linepithema humile casent0005323 profile 1.jpg

4

return to couplet #1 Posterior portion of clypeus with a weakly developed to absent groove (presutural clypeal groove) . . . . . 5

5

return to couplet #4

  • Dorsum of the head with more than 5 erect setae, mesosoma slender, dorsum of the mesonotum with a moderate to strong medial impression, body surface glossy and shiny . . . . . Linepithema iniquum
Linepithema iniquum casent0106982 head 1.jpg
Linepithema iniquum casent0106982 profile 1.jpg
  • Dorsum of the head never with more than 5 erect setae, mesosoma more robust, medial impression on the mesonotum slightly impressed or not impressed at all, body not as glossy and shiny . . . . . Linepithema dispertitum
Linepithema dispertitum casent0010798 head 1.jpg
Linepithema dispertitum casent0010798 profile 1.jpg

6

return to couplet #4

  • Pronotum bearing more than 10 erect setae, whole body surface with long or short erect setae . . . . . Linepithema hirsutum
Linepithema hirsutum casent0179544 h 1 high.jpg
Linepithema hirsutum casent0179544 p 1 high.jpg
  • Pronotum with fewer than 10 erect setae, whole body surface never covered with erect setae . . . . . 7

7

return to couplet #6

  • Posterior margin of the head deeply concave, dorsum of mesonotum never with a medial impression, pronotum usually with 4 (2–8) erect to suberect setae . . . . . Linepithema tsachila
Linepithema tsachila casent0106972 head 1.jpg
Linepithema tsachila casent0106972 profile 1.jpg
  • Posterior margin of the head straight to slightly concave, dorsum of mesonotum without medial impression or slightly impressed, pronotum never with more than 4 erect setae . . . . . 8

8

return to couplet #7

  • Antennal scapes short, surpassing the posterior margin of the head by less than length of the pedicel; propodeum relatively high, with distinct anterior, dorsal and posterior faces, sometimes dorsal face slightly depressed . . . . . Linepithema angulatum
Linepithema angulatum casent0106973 head 1.jpg
Linepithema angulatum casent0106973 profile 1.jpg
  • Antennal scapes relatively long, surpassing the posterior margin of the head by at least length of the pedicel; propodeum usually rounded, not as above . . . . . Linepithema piliferum
Linepithema piliferum casent0106979 head 1.jpg
Linepithema piliferum casent0106979 profile 1.jpg