Key to Camponotus of Japan

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This worker key is based on: Terayama, M. 1999b. The ant genus Camponotus Mayr (Hymenoptera: Formicidae) in Japan. Memoirs of the Myrmecological Society of Japan. 1:25-48.

This key is dated. It does not include additions to the fauna after 1999 and a few species have been transferred to the genus Colobopsis.

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1

  • Heads of major workers with an anterior, flat truncated portion. In minor workers, the fore femur remarkably broad, and the posterior corner of the propodeum approximately right-angled in profile . . . . . 2
  • Heads of major workers without a truncated anterior portion. In minor workers, the fore femur always less broad, if expanded at all; posterior corner of propodeum obtusely angled in profile (with a few exceptions) . . . . . 3

2

return to couplet #1

  • In full face view, the upper, short part of the clypeus produced anteriorly on each side to form a small median process . . . . . Colobopsis nipponica
  • In full face view, the upper, short part of clypeus with nearly straight anterior margin, not produced on each side, the median process very small . . . . . Colobopsis shohki

3

return to couplet #1

  • Body yellow to yellowish brown (head slightly darker in majors) . . . . . Camponotus yambaru
  • Body color not wholly yellow to yellowish brown . . . . . 4

4

return to couplet #3

5

return to couplet #4

  • First and 2nd gastral segments not wholly reddish brown . . . . . 6

6

return to couplet #5

  • Second gastral tergite with a pair of pale-coloured spots or a pale band . . . . . 7
  • Second to 5th gastral tergites concolorous, without spots or bands . . . . . 9

7

return to couplet #6

  • First to 3rd or 4th gastral tergites each with a pair of pale spots or a wide pale band . . . . . Camponotus ogasawarensis
  • First and 2nd gastral tergites each with a pair of yellow spots (those on 1st tergite often fused together); such markings absent from 3rd and 4th tergites . . . . . 8

8

return to couplet #7

  • Anterior margin of clypeus almost straight or weakly convex, not produced . . . . . Camponotus daitoensis

9

return to couplet #6

  • Clypeus produced anteriorly; the advanced portion with straight anterior margin; mandible with 6 or 7 teeth . . . . . 10
  • Clypeus produced at most only slightly; mandible with 4 or 5 teeth . . . . . 11

10

return to couplet #9

  • Pronotum with more than 3 standing hairs; head and gaster also with many standing hairs . . . . . Camponotus monju

11

return to couplet #9

  • Mesosoma and legs reddish brown; a smaller species, total length less than 7 mm . . . . . Camponotus daitoensis
  • Mesonotum and propodeum reddish, and legs blackish; a larger species, total length more than 10 mm . . . . . 12

12

return to couplet #11

13

return to couplet #4

  • Mesosoma dorsally with 20 or more standing hairs . . . . . 14
  • Mesosoma dorsally with 15 or fewer standing hairs . . . . . 16

14

return to couplet #13

  • Propodeal declivity abruptly declivitous; head black, mesosoma brown, and gaster blackish brown . . . . . Camponotus friedae
  • Propodeal declivity moderately declivitous; body largely concolorous black . . . . . 15

15

return to couplet #14

  • A larger species, total length 7 mm or more; in profile the dorsal mesosomal outline from mesonotum to propodeum evenly arched, without a depression . . . . . Camponotus yessensis
  • A smaller species, total length less than 7 mm, even in the major workers; in profile the dorsal outline of propodeum more or less depressed . . . . . Camponotus nipponensis

16

return to couplet #13

  • Larger species; body length exceeding 10 mm in majors or 7 mm in minors . . . . . 17
  • Smaller species; body length less than 7 mm, even in majors . . . . . 21

17

return to couplet #16

  • Anterior margin of clypeus incised or emarginate . . . . . 18
  • Anterior margin of clypeus without incision or emargination . . . . . 19

18

return to couplet #17

  • Body black, legs brown to yellowish brown; in profile posterior edge of propodeum more or less angulate . . . . . Camponotus kiusiuensis
  • Body shiny pitch-black, legs reddish brown to black; in profile posterior edge of propodeum rounded . . . . . Camponotus amamianus

19

return to couplet #17

  • Anterior margin of clypeus not produced medially; gastral tergites with sparse pubescences and somewhat lustrous . . . . . Camponotus herculeanus
  • Anterior margin of clypeus produced medially; gastral tergites with denser pubescences and less lustrous . . . . . 20

20

return to couplet #19

  • Short fine hairs (pubescence) on 2nd gastral tergite sparse, arranged in rows that do not overlap; these hairs 1.5-2 times as long as the mean distance separating them . . . . . Camponotus sp. 6 [sense Terayama et al., 1991]
  • Short fine hairs on 2nd gastral tergite more dense, arranged in rows that overlap each other; these hairs each 4-6 times as long as the mean distance separating them . . . . . Camponotus japonicus

21

return to couplet #16

  • Anterior margin of clypeus medially incised or emarginate; antennal scape of majors long, more than 1.1 times as long as the head width; size variation among workers continuous, without distinct dimorphism . . . . . 22
  • Anterior margin of clypeus entire; antennal scape of majors shorter, less than 1.0 times as long as the head width; workers distinctly dimorphic . . . . . 23

22

return to couplet #21

  • Mesosomal dorsum and petiole without standing hairs; fore femur strongly expanded; metanotal depression distinct; gaster with out maculation . . . . . Camponotus keihitoi
  • Mesosomal dorsum and petiole with standing hairs; fore femur not strongly expanded; metanotal depression absent; 1st and 2nd gastral tergites each with a pair of yellowish or whitish markings . . . . . Camponotus quadrinotatus

23

return to couplet #21

  • Dorsal profile of pro- and mesonotum flat; posterodorsal margin of propodeum angulate, the slope of its posterior face relatively steep . . . . . Camponotus itoi
  • Dorsal profile of pro- and mesonotum arched; posterodorsal margin of propodeum more rounded, inclination of posterior face less steep . . . . . 24

24

return to couplet #23

  • Petiole relatively thick; gaster black, without pale markings on 1st and 2nd tergites . . . . . 25
  • Petiole relatively thin; 1st and 2nd gastral tergites usually each with a pair of pale marks . . . . . 26

25

return to couplet #24

  • In profile, propodeum with a dorsal depression; petiole in profile an inverted V-shape, symmetrical with respect to the axis dividing it into anterior and posterior halves . . . . . Camponotus vitiosus
  • In profile, propodeum with an almost straight dorsal outline; petiole in profile asymmetrical, with the upper edge of the anterior margin lower than that of the posterior margin . . . . . Camponotus bishamon

26

return to couplet #24

  • Eye strongly protruding; petiole of minors in profile relatively thin; petiole of majors seen from above relatively thin . . . . . Camponotus yamaokai
  • Eye relatively weakly protrusive; petiole of minors in profile relatively thick; petiole of majors seen from above relatively thick . . . . . Camponotus nawai