Key to New World Leptogenys

Every Ant Tells a Story - And Scientists Explain Their Stories Here
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Based on Lattke (2011) and Lopez-Munoz et al. (2018).

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1

  • Basal internal mandibular margin well separated from anterior clypeal margin with head in full-face view and mandibles closed, leaving distinct gap wider than mid-mandibular width (Fig. 1a) . . . . . 2
  • Basal internal margin of each mandible shuts tightly against clypeus, if gap is present it is narrow and not wider than mid-mandibular width (Fig. 1b) . . . . . 29
1a. Head of Leptogenys montuosa worker
1b. Head of Leptogenys elongata worker

2

return to couplet #1

  • With head in full-face view hypostomal teeth not visible at all . . . . . 14

3

return to couplet #2

  • Petiole with an apical tooth or crest that overhangs at least part of posterior margin of node in lateral view (Fig. 3a) . . . . . 4
  • Posterior margin of node without overhanging tooth or crest (Fig. 3b) . . . . . 9

4

return to couplet #3

  • Petiolar node with acutely pointed apical tooth in lateral view (see images in couplets 5 and 6) . . . . . 5
  • Petiolar node with apical crest or blunt tooth (see images in couplet 8) . . . . . 7

5

return to couplet #4

  • Head in full-face view broad (CI < 0.90) with lateral margins distinctly diverging anteriorly (see images in couplet 6) . . . . . 6
  • Head narrower (CI > 0.90) with lateral margins sub-parallel or slightly diverging anteriorly . . . . . Leptogenys bohlsi
Head of Leptogenys bohlsi worker
Profile of Leptogenys bohlsi worker

6

return to couplet #5

Head of Leptogenys paraensis worker
Profile of Leptogenys paraensis worker
Profile of Leptogenys unistimulosa worker

7

return to couplet #4

  • Mandible with parallel basal and external margins, not expanding apicad . . . . . Leptogenys pubiceps (in part - also #25)
Leptogenys pubiceps casent0903969 p 1 high.jpg

8

return to couplet #7

  • With head in full-face view mandible mostly straight except for strong basal arch; hypostomal tooth large, frequently extending behind mandible; petiolar node in dorsal view subquadrate . . . . . Leptogenys gatu
Head of Leptogenys gatu worker
Profile of Leptogenys gatu worker
  • Mandible evenly arched, without strong basal arch; hypostomal tooth small, barely projecting anterad of clypeus; petiolar node in dorsal view elongate . . . . . Leptogenys punctaticeps (in part - also #28)
Profile of Leptogenys punctaticeps worker

9

return to couplet #3

10

return to couplet #9

  • Mandible with parallel basal and external margins, not widening apicad; mandibular dorsum smooth and shining . . . . . Leptogenys maxillosa
Head of Leptogenys maxillosa worker
Profile of Leptogenys maxillosa worker
  • Mandible gradually widening apicad; mandibular dorsum finely striolate . . . . . Leptogenys maya
Head of Leptogenys maya worker
Profile of Leptogenys maya worker

11

return to couplet #9

  • WL > 2.5 mm; HW > 1.3 mm; body covered with abundant decumbent golden pilosity that partially obscures the underlying integument . . . . . 12
  • WL < 2.5 mm; HW < 1.3 mm; body with sparse erect pilosity never obscuring the underlying integument . . . . . 13

12

return to couplet #11

  • Head in full-face view with evenly arched mandible, with subparallel external and basal margins; body black . . . . . Leptogenys chamela
Head of Leptogenys chamela worker
Profile of Leptogenys chamela worker
  • Mandible with an approximately straight external margin and convex basal margin, apically widening; body ferruginous . . . . . Leptogenys sonora
Head of Leptogenys sonora worker
Profile of Leptogenys sonora worker

13

return to couplet #11

  • Third antennal segment > 2 × as long as wide; clypeus in cephalic full-face view with a prominent median laminate lobe, anterolaterally bordered by narrow lamella . . . . . Leptogenys montuosa
Head of Leptogenys montuosa worker
Profile of Leptogenys montuosa worker
  • Third antennal segment < 2 × as long as wide; clypeus with modest median lobe of thick cuticle, not anterolaterally thin and lamellate . . . . . Leptogenys arcuata (in part - also #22)
Head of Leptogenys arcuata worker
Profile of Leptogenys arcuata worker

14

return to couplet #2

  • Petiole in lateral view without dorsoposterior tooth or point (Fig. 14a) . . . . . 15
14a. Leptogenys sonora worker
  • Petiole with a dorsoposterior tooth, blunt point or crest that usually overhangs the posterior petiolar margin (Figs. 14b ) . . . . . 25

15

return to couplet #14

Head of Leptogenys panops worker
Profile of Leptogenys panops worker
  • Petiolar node subquadrate in lateral view (compare petiolar node in profile view of panops above to profile view of workers in couplets below) . . . . . 16

16

return to couplet #15

  • Cephalic dorsum between and posterad of eyes mostly densely sculptured (Fig 16a) . . . . . 17
16a Head of Leptogenys wheeleri and 16b. Head of Leptogenys toxeres
  • Cephalic dorsum between and posterad of eyes mostly smooth and shining, at most with sparse piligerous punctulae (Fig 16b) . . . . . 21

17

return to couplet #16

  • Dorsum of head and mesosoma opaque; dorsum of mesosoma in lateral view with no standing hairs . . . . . 18
  • Dorsum of head and mesosoma with shining cuticle; dorsum of mesosoma with abundant standing hairs . . . . . 19

18

return to couplet #17

  • Mandible with subparallel basal and external margins; head broad in full-face view; ocular diameter > 1/3 the length of lateral cephalic margin . . . . . Leptogenys wheeleri
Head of Leptogenys wheeleri worker
Profile of Leptogenys wheeleri worker
  • Mandible widens apically; head elongate in full-face view; ocular diameter 1/4 of lateral cephalic margin . . . . . Leptogenys ixta
Head of Leptogenys ixta worker
Profile of Leptogenys ixta worker

19

return to couplet #17

Profile of Leptogenys donisthorpei worker
  • Head longer than wide, mandible wider apically than basally . . . . . 20

20

return to couplet #19

Profile of Leptogenys peninsularis worker
Head of Leptogenys bifida worker
Profile of Leptogenys bifida worker

21

return to couplet #16

  • Head in full-face view with brief anteromedian clypeal lobe, not longer than basal width (Fig. 21a) . . . . . 22
  • Head with clypeal lobe longer than basal width (Fig. 21b) . . . . . 23

22

return to couplet #21

  • Petiolar node in lateral view with continuously convex anterodorsal margin; node posterior margin weakly convex . . . . . Leptogenys santacruzi
Head of Leptogenys santacruzi worker
Profile of Leptogenys santacruzi worker
  • Petiolar node in lateral view with vertical anterior margin and convex dorsal margin; posterior margin vertical . . . . . Leptogenys arcuata (in part - also #13)
Head of Leptogenys arcuata worker
Profile of Leptogenys arcuata worker

23

return to couplet #21

  • Petiolar node wider than long in dorsal view with sub-parallel anterior and posterior margins; head, mesosoma and petiole with numerous punctae; clypeal lobe broadly triangular . . . . . Leptogenys toxeres
Head of Leptogenys toxeres worker
Profile of Leptogenys toxeres worker
  • Petiolar node longer than wide with a convex anterior margin and a transverse, straight posterior margin; body mostly smooth and shining with sparse minute punctulae; clypeal lobe slender . . . . . 24

24

return to couplet #23

  • Width of third antennal segment < 1/2 its length; length of clypeal median lobe less than width of third antennal segment; WL > 1.3 mm . . . . . Leptogenys gagates
Head of Leptogenys gagates worker
Profile of Leptogenys gagates worker
  • Width of third antennal segment > 1/2 its length; length of clypeal median lobe more than width of third antennal segment; WL < 1.3 mm . . . . . Leptogenys langi (in part - also #70)
Head of Leptogenys langi worker
Profile of Leptogenys langi worker

25

return to couplet #14

  • Mandible parallel-sided in cephalic full-face view; cephalic dorsum usually smooth and shining with scattered punctulae . . . . . Leptogenys pubiceps (in part - also #7)
Leptogenys pubiceps casent0903969 p 1 high.jpg
  • Mandible widening apicad; cephalic dorsum variable, usually punctate with striae at least on anterior region close to antennal insertions, or mostly smooth and shining . . . . . 26

26

return to couplet #25

  • Head longer than wide in full-face view; body lacking iridescence; petiolar node with crest or modest apical tooth (Fig. ) . . . . . 27
  • Head wider than long; body with purple-blue iridescence; petiolar node with large apical tooth . . . . . Leptogenys ingens
Head of Leptogenys ingens worker
Profile of Leptogenys ingens worker

27

return to couplet #26

  • In cephalic full-face view lateral clypeal lobe prominent, appearing as distinct lobe or blunt tooth next to median clypeal lobe posterior margin of the petiolar node broadly concave in lateral view (Figs. ) . . . . . Leptogenys carbonaria (in part - also #44)
Head of Leptogenys carbonaria worker
Profile of Leptogenys carbonaria worker
  • Lateral clypeal lobe inconspicuous, not appearing as distinct lobe or blunt tooth next to median clypeal lobe (Fig. ); posterior margin of the petiolar node sinuate . . . . . 28

28

return to couplet #27

  • Cephalic dorsum mostly smooth and shining; apex of petiolar node with distinct short, slender tooth . . . . . Leptogenys amazonica
Head of Leptogenys amazonica worker
Profile of Leptogenys amazonica worker
  • Cephalic dorsum mostly punctate; apex of petiolar node with blunt crest, not shaped as a distinct tooth . . . . . Leptogenys punctaticeps (in part - also #8)
Profile of Leptogenys punctaticeps worker

29

return to couplet #1

  • Petiolar node mostly triangular and elongate in lateral view, with a sloping, and fairly straight, anterior margin and a vertical posterior margin; if distinct vertical anterior margin is present, it is < 1/4 the height of posterior margin (Fig. ) . . . . . 30
  • Node not triangular, generally semi-quadrate with vertical, subparallel, anterior and posterior margins, and a more or less horizontal dorsal margin (rarely angular), the anterior margin is > 1/4 the length of the posterior margin (Fig. ); less commonly the node may be dome-shaped or with a continuously convex anterodorsal margin and more or less vertical posterior margin. (Fig. ) . . . . . 39

30

return to couplet #29

  • Propodeal dorsum mostly sculpted, either striate or punctulate (Fig. 30a) . . . . . 31
  • Propodeal dorsum mostly smooth and shining (Fig. 30b) . . . . . 34

31

return to couplet #30

  • Petiole in lateral view with a distinct dorso-apical tooth (Fig. ); anteromedian clypeal process flanked by lateral lobes near apex . . . . . Leptogenys tiobil
Head of Leptogenys tiobil worker
Profile of Leptogenys tiobil worker
  • Petiole never dentate, dorso-apically rounded or with a sharp angle at most (Figs. ); clypeal process regularly triangular at apex (Figs. ) . . . . . 32

32

return to couplet #31

Head of Leptogenys socorda worker
Profile of Leptogenys socorda worker
  • Pronotal disc punctulate, or smooth and shining; body frequently with blue opalescence . . . . . 33

33

return to couplet #32

  • Pronotal disc mostly smooth and shining with sparse punctulae; propodeal dorsum transversely striate; mandible widening apicad with low jagged denticles on chewing margin . . . . . Leptogenys famelica
Head of Leptogenys famelica worker
Dorsal view of Leptogenys famelica mesosoma
  • Pronotal disc densely punctulate; propodeal dorsum densely punctulate, striae mostly limited to declivity; mandible of equal width apicad, chewing margin edentate . . . . . Leptogenys imperatrix
Head of Leptogenys imperatrix worker
Dorsal view of Leptogenys imperatrix mesosoma

34

return to couplet #30

  • Mesosoma in lateral view with dorsal margin mostly straight, metanotal groove shallow (Fig. ) . . . . . 35
  • Mesosoma in lateral view with dorsal margin forming two distinct convexities separated by broad metanotal groove (Fig. ) . . . . . 37

35

return to couplet #34

  • Anterior margin of petiolar node in dorsal view < 1/2 the width of posterior margin, node elongate=>36 . . . . . 36
  • Anterior margin of petiolar node ≥ 1/2 the width of posterior margin . . . . . Leptogenys pucuna

36

return to couplet #35

  • Foretibial apex with transparent cuticular lobe next to strigil; head subrectangular in full-face view; eye flattened, barely convex; constriction between abdominal segments III and IV weak . . . . . Leptogenys gaigei
Head of Leptogenys gaigei worker
Profile of Leptogenys gaigei worker
  • Foretibial apex without transparent lobe next to strigil; head elongate in full-face view; eye broadly convex; constriction between abdominal segments III and IV strong . . . . . Leptogenys vogeli
Head of Leptogenys vogeli worker
Profile of Leptogenys vogeli worker

37

  • Propodeal declivity in lateral view ending in an abrupt overhang formed by propodeal lobes (Fig. 40B); mandible expanding apicad of mid-length; body with blue iridescence (southeastern Brazil) . . . . . . Leptogenys luederwaldti
Profile of Leptogenys luederwaldti worker
  • Propodeal lobes in lateral view absent or low and weakly developed (Fig. 71B), shaped either rounded or bluntly triangular, never forming an overhang; mandible not expanding apicad of mid-length; body lacking any iridescence . . . . . 38

38

return to couplet #37

  • Petiolar node in lateral view shaped as elongate triangle, with brief vertical anterior margin; masticatory margin of mandible meeting internal angle at an abrupt, almost perpendicular angle; foretibial apex with a transparent cuticular lobe next to strigil (Panama—eastern Peru) . . . . . . Leptogenys cuneata
Head of Leptogenys cuneata worker
Profile of Leptogenys cuneata worker
  • Petiolar node in lateral view not elongate, anterior and dorsal margins form a continuous convexity; masticatory and internal mandibular margins meeting through blunt angle or convexity; foretibial apex without a transparent cuticular lobe next to strigil . . . . . 38a

38a

return to couplet #38

  • Head subquadrate (CI 0.76–0.78), median clypeal process shaped as short rounded lobe with 3–4 seta on apex; mandible wid-est at mid length; propodeum rounded and unarmed (eastern Peru) . . . . . . Leptogenys peruana
Head of Leptogenys peruana worker
Profile of Leptogenys peruana worker
  • Head in dorsal view elongate (CI 0.56–0.61), median clypeal process triangular, evenly tapering anterad, apex lacking setae; mandible in dorsal view of uniform width; propodeal declivity with low, but distinct, lateral lobes or teeth (southeastern Brazil). . . . . 38b

38b

return to couplet #38a

  • Size larger (WL 2.91–2.94 mm); propodeal dorsum smooth and shining with sparse piligerous punctulae; propodeal lobe in lat-eral view triangular with jagged dorsal margin . . . . . . Leptogenys academica
Head of Leptogenys peruana worker
Profile of Leptogenys peruana worker
  • Size smaller (WL 2.47–2.72 mm); propodeal dorsum mostly smooth and shining with scattered patches of shallow transverse rugulae and scattered shallow punctae; propodeal lobe shaped as low rounded lobe without jagged margins . . . . . . Leptogenys carioca
Head of Leptogenys carioca worker
Profile of Leptogenys carioca worker

39

return to couplet #29

  • Petiolar node in lateral view approximately dome-shaped, with the highest part close to the mid-distance of the node; anterior margin convex or with a blunt angle between the anterior and dorsal margins . . . . . 40
  • Petiolar node subquadrate, with vertical, subparallel, anterior and posterior margins, and horizontal or convex dorsal margin; or the anterodorsal margin is convex and posterior margin vertical . . . . . 43

40

return to couplet #39

  • Mandible triangular; head, mesosoma, and petiole with extensive sculpturing . . . . . Leptogenys honduriana
Head of Leptogenys honduriana worker
Profile of Leptogenys honduriana worker
  • Mandible slender and semi-falcate; head, mesosoma, and petiole mostly smooth and shining . . . . . 41

41

return to couplet #40

Head of Leptogenys reggae worker
Profile of Leptogenys reggae worker

42

return to couplet #41

  • Head in full-face view with eyes at mid-cephalic length; basal and masticatory mandibular margins separated by blunt angle . . . . . Leptogenys linda
Head of Leptogenys toxeres worker
Profile of Leptogenys toxeres worker
  • Eyes closer to mandibular insertion than to mid-cephalic length; basal and masticatory mandibular margins joined through broad curve . . . . . Leptogenys tama
Head of Leptogenys tama worker
Profile of Leptogenys tama worker

43

return to couplet #39

  • Dorsum of head and mesosoma with extensive sculpturing . . . . . 44
  • Dorsum of head and mesosoma mostly smooth and shining with sparse punctulae . . . . . 52

44

return to couplet #43

  • Petiolar node in lateral view with posterodorsal blunt point that overhangs posterior petiolar margin . . . . . Leptogenys carbonaria (in part - also #27)
Head of Leptogenys carbonaria worker
Profile of Leptogenys carbonaria worker
  • Petiolar node without posterodorsal point or denticle . . . . . 45

45

return to couplet #44

  • Postpetiolar tergite opaque and densely punctate, the space surrounding each puncture equal to or less than the diameter of each puncture . . . . . 46
  • Postpetiolar tergite mostly smooth and shining with sparse punctulae, the space surrounding each puncture many times greater than the diameter of each puncture . . . . . 48

46

return to couplet #45

Head of Leptogenys quirozi worker
Profile of Leptogenys quirozi worker
  • Mesosoma with 10 or more standing hairs on dorsum . . . . . 47

47

return to couplet #46

  • Clypeal anterior margin in cephalic full-face view with strongly developed lateral clypeal lobes at each side of median lobe . . . . . Leptogenys foraminosa
  • Clypeus with anterior margin converging evenly to median lobe, lateral clypeal lobes indistinct . . . . . Leptogenys sianka
Head of Leptogenys sianka worker
Profile of Leptogenys sianka worker

48

return to couplet #45

  • Mandible not widening apicad; basal and external margins mostly semi-parallel . . . . . 49
  • Mandible usually widening apicad, becoming triangular, or unusually shaped . . . . . 50

49

return to couplet #48

  • Scape surpasses posterior cephalic margin by ≥ 1/3 its length; second funicular segment almost 2 × as long as third segment; mandibular dorsum mostly smooth, with weak striolae at most . . . . . Leptogenys volcanica
  • Scape surpasses posterior cephalic margin by ≤ 1/4 its length; second funicular segment slightly longer than third segment; mandibular dorsum mostly striate . . . . . Leptogenys linearis (in part - also #61)
Head of Leptogenys linearis worker
Profile of Leptogenys linearis worker

50

return to couplet #48

  • Mandible triangular; median clypeal lobe ending in a blunt point . . . . . 51
  • Mandible with large preapical rounded notch; median clypeal lobe apically truncate . . . . . Leptogenys oaxaca
Head of Leptogenys oaxaca worker
Profile of Leptogenys oaxaca worker

51

return to couplet #50

Head of Leptogenys elongata worker
Profile of Leptogenys elongata worker
Head of Leptogenys manni worker
Profile of Leptogenys manni worker

52

return to couplet #43

  • Apical half of mandible increasing in width giving mandible a triangular or semi-triangular aspect (Fig. ) . . . . . 53
  • Apical half of mandibular dorsal surface of uniform width; masticatory margin not expanded into semi-triangular shape (Fig. ) . . . . . 60

53

return to couplet #52

  • Propodeum with lateral tooth or lobe; mandibular masticatory margin edentate . . . . . 54
  • Propodeum without a trace of lobe or tooth, laterally rounded; mandible with preapical tooth or denticles along masticatory margin . . . . . 57

54

return to couplet #53

  • Mandible elongate, basal margin > 2 × longer than masticatory margin . . . . . 55
  • Mandible triangular, lengths of basal and masticatory margin approximately equal . . . . . 56

55

return to couplet #54

  • Large ant, WL > 2.3 mm; mandible does not shut tight against clypeus (Fig. ), meso- and metapleura with variable amounts of striae . . . . . Leptogenys ciliata
  • Small ant, WL < 2.3 mm; mandible shuts tight against clypeus (Fig. ); meso- and metapleura smooth and shining . . . . . Leptogenys consanguinea
Profile of Leptogenys consanguinea worker

56

return to couplet #54

  • Compound eye covers almost 1/3 the length of lateral cephalic margin; eye dorsolaterally placed on head . . . . . Leptogenys nigricans
Head of Leptogenys nigricans worker
Profile of Leptogenys nigricans worker
  • Compound eye covering ≤ 1/4 lateral cephalic margin; eye placed laterally on head . . . . . Leptogenys deborae
Head of Leptogenys deborae worker
Profile of Leptogenys deborae worker

57

return to couplet #53

  • Length of second antennal segment 1/2 of segment III; petiolar node elongate in dorsal view, width < 85% of length . . . . . 58
  • Length of second antennal segment > 1/2 of segment III; petiolar node subquadrate, width > 85% of length . . . . . 59

58

return to couplet #57

  • Mesonotum wider than long; mesopleural lobe shaped low and convex . . . . . Leptogenys phylloba
Head of Leptogenys phylloba worker
Profile of Leptogenys phylloba worker
  • Mesonotum longer than wide; mesopleural lobe projects laterally as small fin or wing . . . . . Leptogenys pinna
Head of Leptogenys pinna worker
Profile of Leptogenys pinna worker

59

return to couplet #57

  • Eye length > oculomalar distance; masticatory margin of mandible denticulate to crenulate . . . . . Leptogenys serrata
Head of Leptogenys serrata worker
Profile of Leptogenys serrata worker
  • Eye length < oculomalar distance; masticatory margin of mandible edentate except for single preapical tooth . . . . . Leptogenys pittieri
Head of Leptogenys pittieri worker
Profile of Leptogenys pittieri worker

60

return to couplet #52

  • Compound eyes situated dorsolaterally with head in full-face view; not only is whole dorsal ocular perimeter observable, but also part of ventral ocular perimeter, or only a small part or none of the dorsal ocular margin extends beyond the lateral cephalic margin (Fig. ) . . . . . 61
  • Compound eyes extended more laterally in full-face view of head; the ventral ocular perimeter is not visible, and all or most of the dorsal ocular margin extends beyond the lateral cephalic margin (Fig. ) . . . . . 65

61

return to couplet #60

  • Dorsal mandibular surface mostly striate; dorsal mesosomal margin continuously curved in lateral view; clypeal apex with at least two stout setae . . . . . Leptogenys linearis (in part - also #48)
Head of Leptogenys linearis worker
Profile of Leptogenys linearis worker
  • Mandibles mostly smooth and shining with sparse punctures; dorsal mesosomal margin divided by deep or shallow metanotal groove into convex promesonotal margin, and convex or flat propodeal margin; clypeal apex lacking stout setae . . . . . 62

62

return to couplet #61

  • Width of anterior petiolar margin ≤ 1/2 width of posterior margin in dorsal view . . . . . 63
  • Anterior margin of petiole > 1/2 width of posterior margin in dorsal view . . . . . 64

63

return to couplet #62

  • Mesonotum 3 × wider than long in dorsal view; node with anterior margin 1/2 width of posterior margin in dorsal view . . . . . Leptogenys rasila
Head of Leptogenys rasila worker
Profile of Leptogenys rasila worker
  • Width of mesonotum ≤ 2 × its length; anterior margin of node < 1/2 width of posterior margin . . . . . Leptogenys iheringi (in part - also #75)
Head of Leptogenys iheringi worker
Profile of Leptogenys iheringi worker

64

return to couplet #62

  • HL < 1.10 mm, WL < 1.70 mm; width of third antennal segment > 1/2 its length . . . . . Leptogenys amu
Head of Leptogenys amu worker
Profile of Leptogenys amu worker
  • HL > 1.10 mm, WL > 1.70 mm; width of third antennal segment approximately 1/4 its length . . . . . Leptogenys crudelis
Head of Leptogenys crudelis worker
Profile of Leptogenys crudelis worker

65

return to couplet #60

  • With head in full-face view, the midpoint of compound eye closer to mandibular insertion than to mid-length of lateral cephalic margin (Fig. ) . . . . . 66
  • With head in full-face view, the midpoint of compound eye exactly at, or closer to mid-length of lateral cephalic margin than to mandibular insertion (Fig. ) . . . . . 68

66

return to couplet #65

  • Head in full-face view with semiparallel lateral margins; abdominal tergites III and IV mostly smooth and shining with sparse punctulae . . . . . 67
  • Head with anteriorly diverging lateral margins; abdominal tergites III and IV punctate to varying degree . . . . . Leptogenys foveonates
Head of Leptogenys foveonates worker
Profile of Leptogenys foveonates worker

67

return to couplet #66

  • Clypeal anterior margin in cephalic full-face view with gradually tapering median lobe; in lateral view propodeum edentate, with low triangular lobes at most . . . . . Leptogenys ritae
Head of Leptogenys ritae worker
Profile of Leptogenys ritae worker
  • Clypeal anterior margin with abruptly projecting slender median lobe; propodeum with 2 distinct teeth . . . . . Leptogenys corniculans
Head of Leptogenys corniculans worker
Profile of Leptogenys corniculans worker

68

return to couplet #65

  • Median clypeal lobe elongate and slender in cephalic full-face view (Fig. ) . . . . . 69
  • Median clypeal lobe broader, triangular with a pointed, blunt or truncate apex (Figs. ) . . . . . 71

69

return to couplet #68

  • Compound eye large (CI > 0.30), covering almost 1/3 length of lateral cephalic margin . . . . . Leptogenys mavaca
Head of Leptogenys mavaca worker
Profile of Leptogenys mavaca worker
  • Compound eye smaller (CI < 0.30), covering ≤ 1/4 length of lateral cephalic margin . . . . . 70

70

return to couplet #69

  • Scape extending beyond the posterior cephalic margin by > 1/3 length; petiole with prominent anterior shelf in lateral view, almost 1/2 length of node . . . . . Leptogenys cracens
Head of Leptogenys cracens worker
Profile of Leptogenys cracens worker
  • Scape extending beyond the posterior cephalic margin by about 1/4 length; petiole without prominent anterior shelf, < 1/4 length of the node . . . . . Leptogenys langi (in part - also #24)
Head of Leptogenys langi worker
Profile of Leptogenys langi worker

71

return to couplet #68

  • Median clypeal lobe with subquadrate or bluntly angular apex, sometimes with apical lamellate denticle (Fig. ) . . . . . 72
  • Clypeus in cephalic full-face view with median lobe evenly tapering anterad to pointed or rounded apex (Fig. ) . . . . . 73

72

return to couplet #71

  • Mesometapleural suture broad, scrobiculate, widening anterad; cross-section of petiolar node at mid-length convex; width of second funicular segment more than 1/2 its length . . . . . Leptogenys cordoba
Head of Leptogenys cordoba worker
Profile of Leptogenys cordoba worker
  • Mesometapleural suture fine, smooth, not scrobiculate; cross-section of petiolar node at mid-length V- shaped; width of second funicular segment less than 1/3 its length . . . . . Leptogenys glabra
Head of Leptogenys glabra worker
Profile of Leptogenys glabra worker

73

return to couplet #71

  • Petiolar node elongate in dorsal view, anterior margin at most half as wide as posterior margin . . . . . 74
  • Petiolar node subquadrate in dorsal view, anterior margin more than half as wide as posterior margin . . . . . 78

74

return to couplet #73

  • Propodeum with distinct lobes or denticles (Figs. 11B, 45B) . . . . . 75
  • Propodeum without teeth or denticles, at the most a low lobe may be present posterad of each propodeal spiracle (Figs. ) . . . . . 77

75

return to couplet #74

  • Petiolar node with anterior and dorsal margins forming continuous convexity in lateral view; postero-dorsal propodeal margin evenly convex until apex of propodeal lobe in lateral view; WL > 1.4 mm . . . . . Leptogenys iheringi (in part - also #63)
Head of Leptogenys iheringi worker
Profile of Leptogenys iheringi worker
  • Node with distinctly vertical anterior margin and convex dorsal in lateral view; posterodorsal propodeal margin convex until base of propodeal tooth, tooth abruptly projecting; WL < 1.4 mm . . . . . 76

76

return to couplet #75

  • Scape surpasses posterior cephalic margin by one apical diameter; width of third antennal segment > 1/2 its length; body without iridescence . . . . . Leptogenys gorgona
Head of Leptogenys gorgona worker
Profile of Leptogenys gorgona worker
  • Scape surpasses posterior cephalic margin by at least 3 apical widths; width of third antennal segment ≤ 1/2 its length; body usually with blue iridescence . . . . . Leptogenys melena
Head of Leptogenys melena worker
Profile of Leptogenys melena worker

77

return to couplet #74

  • Compound eye situated in the middle of the lateral cephalic margin with head in full-face view; width of petiolar posterior margin > 3/4 length of petiole . . . . . Leptogenys antillana
Head of Leptogenys antillana worker
Profile of Leptogenys antillana worker
  • Compound eye situated anterad of midpoint of lateral cephalic margin; width of petiolar posterior margin < 3/4 length of petiole . . . . . Leptogenys quadrata
Head of Leptogenys quadrata worker
Profile of Leptogenys quadrata worker

78

return to couplet #73

  • Propodeum with distinct denticles or lobes (Fig. ) . . . . . 79
  • Propodeum unarmed, without teeth or denticles, at most low swelling may be present next to each propodeal spiracle (Fig. ) . . . . . 85

79

return to couplet #78

  • Length of third antennal segment equal to or more than twice its apical width . . . . . 80
  • Length of third antennal segment less than twice its apical width . . . . . 82

80

return to couplet #79

  • Compound eye large, occupying at least 1/3 lateral cephalic margin in cephalic full-face view . . . . . Leptogenys minima
Head of Leptogenys minima worker
Profile of Leptogenys minima worker
  • Compound eye smaller, occupying ≤ 1/4 lateral cephalic margin (Fig. ) . . . . . 81

81

return to couplet #80

  • Mesonotum transverse in dorsal view, at least 3 × wider than long; metanotal groove smooth . . . . . Leptogenys quiriguana
Head of Leptogenys quiriguana worker
Profile of Leptogenys quiriguana worker
  • Mesonotum oval in dorsal view, 2 × as long as broad; metanotal groove scrobiculate . . . . . Leptogenys australis
Head of Leptogenys australis worker
Profile of Leptogenys australis worker

82

return to couplet #79

  • Compound eye small, approximately 4 ommatidia across, OI < 0.15 . . . . . Leptogenys rufa
Head of Leptogenys rufa worker
Profile of Leptogenys rufa worker
  • Compound eye larger, at least 8 ommatidia across, OI > 0.15 (Fig. ) . . . . . 83

83

return to couplet #82

  • Basal mandibular margin with 3 – 2 stiff setae basad; compound eye mostly flat . . . . . Leptogenys guianensis
Head of Leptogenys guianensis worker
Profile of Leptogenys guianensis worker
  • Basal mandibular margin with sparse pilosity, none standing out as setae or noticeably thick; compound eye weakly convex (Fig. ) . . . . . 84

84

return to couplet #83

  • Mandible with basal and masticatory margin joined by continuously curved flange in dorsal view; propodeal spiracle elongate . . . . . Leptogenys yocota
Head of Leptogenys yocota worker
Profile of Leptogenys yocota worker
  • Mandible with basal and masticatory margin separated by blunt angle; propodeal spiracle broadly oval . . . . . Leptogenys orchidioides

85

return to couplet #78

  • Mesonotum narrow and parallel sided, with straight anterior and posterior margins in dorsal view; mandible with a sinuate basal margin in cephalic full-face view, with a basal convexity and apical concavity . . . . . 86
  • Mesonotum not parallel sided, with at least one curved margin; basal mandibular margin not sinuate, either mostly convex, or basally convex and apically straight . . . . . 87

86

return to couplet #85

  • Apical width of the third antennal segment ≥ 3/4 its length . . . . . Leptogenys pusilla
Head of Leptogenys pusilla worker
Profile of Leptogenys pusilla worker
Head of Leptogenys josephi worker
Profile of Leptogenys josephi worker

87

return to couplet #85

  • Length of third antennal segment ≥ 2 × its apical width; compound eye larger (OI: 0.23 – 0.27) . . . . . Leptogenys erugata
Head of Leptogenys erugata worker
Profile of Leptogenys erugata worker
  • Length of third antennal segment < 2 × its apical width; compound eye smaller (OI: 0.18 – 0.20) . . . . . Leptogenys kiche
Head of Leptogenys kiche worker
Profile of Leptogenys kiche worker

References