Key to New World Gnamptogenys Species

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Based on Lattke, J.E., Fernández, F. & Palacio, E.E. 2007. Identification of the species of Gnamptogenys Roger in the Americas (pp. 254-270). In Snelling, R.R., Fisher, B.L. & Ward, P.S. (eds). Advances in ant systematics: homage to E.O. Wilson – 50 years of contributions. Memoirs of the American Entomological Institute 80: 690 pp. and modifications from: Lattke, J.E. & Delsinne, T. 2016. Revisionary and natural history notes on some species of the genus Gnamptogenys Roger, 1863. Myrmecological News 22: 141-147.

This key does not include the species Gnamptogenys aspera

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1

  • Frontal carina not covering all of base of scape, at least neck visible; petiolar spiracle facing ventrolaterally, not in depression; promesonotal suture well marked, totally interrupting dorsal mesosomal sculpture . . . . . 2
  • Frontal carina not totally covering base of scape, at least neck visible; petiolar spiracle facing ventrolaterally, not in depression; promesonotal suture absent to well-impressed but never interrupting dorsal mesosomal sculpture . . . . . 25
  • Frontal carina in dorsal view covering all of scape base, including condyle and neck; petiolar spiracle facing ventrally, located in depression; promesonotal suture absent to lightly impressed, never interrupting dorsal mesosomal sculpture . . . . . 75

2

Return to couplet #1

  • Petiolar node with semiparallel anterior and posterior margins in lateral view, both forming approximate right angles with the dorsal margin; cephalic vertex usually smooth and shining, sometimes with weak transverse striae . . . . . 3
  • Petiolar node with a single curved anterodorsal margin or anterior and dorsal margins separated by a blunt angle; cephalic vertex usually with sculpturing . . . . . 6

3

Return to couplet #2

  • Mesosomal dorsum with large smooth and shining areas . . . . . 4
  • Mesosomal dorsum totally sculptured, usually costulate or rugulose . . . . . 5

4

Return to couplet #3

  • Metanotal groove well-impressed, interrupting dorsal mesosomal sculpture; metacoxal dorsum with lobe or denticle; propodeal declivity lacking lobes . . . . . Gnamptogenys relicta
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Profile of Gnamptogenys relicta worker

5

Return to couplet #3

Head of Gnamptogenys haytiana worker
Profile of Gnamptogenys haytiana worker
  • Postpetiolar dorsum longitudinally costulate; body black to dark brown . . . . . Gnamptogenys mina
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Profile of Gnamptogenys mina worker

6

Return to couplet #2

  • Propodeal spiracle separated from declivitous margin by more than one diameter in lateral view; metacoxal dorsum unarmed . . . . . Gnamptogenys lavra
  • Propodeal spiracle separated from declivitous margin by less than one diameter; metacoxal dorsum with a lobe or denticles . . . . . 7

7

Return to couplet #6

  • Mesosomal dorsum with a well defined metanotal groove . . . . . 8

8

Return to couplet #7

  • Dorsum of abdominal tergites III and IV longitudinally costulate . . . . . 9

9

Return to couplet #8

  • Subpetiolar process subquadrate in lateral view, with a posterior angle . . . . . 10
  • Subpetiolar process forming an anterior projecting lobe, without a posterior angle . . . . . 11

10

Return to couplet #9

  • Area between promesonotal suture and metanotal groove narrow and of uniform width; anterior mesonotal margin convex . . . . . Gnamptogenys bisulca
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Profile of Gnamptogenys bisulca worker
  • Area between promesonotal suture and metanotal groove wide and ovaloid; anterior mesonotal margin forms a blunt angle . . . . . species A

11

Return to couplet #9

  • Anterior margin of clypeal lamella bluntly angular; cephalic vertex longitudinally costulate . . . . . Gnamptogenys brunnea
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Profile of Gnamptogenys brunnea worker
  • Anterior margin of clypeal lamella evenly convex; cephalic vertex with less than five transverse costulae . . . . . species B

12

Return to couplet #7

  • Petiolar node erect in lateral view, the dorsal margin separated from the anterior and posterior margins by blunt angles . . . . . 13
  • Petiolar node posteriorly inclined in lateral view, with a broadly curved anterodorsal margin contrasting with the angle separating the dorsal margin from the posterior margin . . . . . 15

13

Return to couplet #12

Head of Gnamptogenys moelleri worker
Profile of Gnamptogenys moelleri worker

14

Return to couplet #2

  • Propodeal declivity with 5-11, sometimes fewer, longitudinal costulae between spiracles and 1-3 transverse costulae between each spiracle and the longitudinal costulae; scapes with sparse pilosity, less than six decumbent and semi-erect hairs . . . . . Gnamptogenys striatula
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Profile of Gnamptogenys striatula worker
  • Propodeal declivity with 13-16 longitudinal costulae between spiracles and no transverse costulae between each spiracle and the longitudinal costulae; scapes with dense, uniformly decumbent pilosity, more than six decumbent and semi-erect hairs . . . . . Gnamptogenys ammophila
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Profile of Gnamptogenys ammophila worker

15

return to couplet #12

  • Petiolar node with blunt or pointed apex overhanging posterior margin in lateral view; subpetiolar process in ventral view with edge of mostly uniform width, widening only at union with sternite . . . . . 16
  • Petiolar node with apex barely overhanging posterior margin; subpetiolar process in ventral view cuneiform, anteriorly of uniform width, widening posteriorly into a bifurcate process . . . . . 22

16

return to couplet #15

  • Petiolar node with a blunt apex in lateral view . . . . . 17
Head of Gnamptogenys acuta worker
Profile of Gnamptogenys acuta worker

17

return to couplet #16

  • Postpetiolar sternite with a median smooth and shining area; vertex usually with 4 – 5 transverse costulae next to vertexal carina . . . . . Gnamptogenys gracilis
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Profile of Gnamptogenys gracilis worker
  • Postpetiolar sternite totally costulate or striate; cephalic vertex usually with a single, occasionally more than three, transverse costulae next to vertexal carina . . . . . 18

18

return to couplet #17

  • Scape in frontal view with more than 10 erect hairs along its posterior margin, not including basal pilosity . . . . . 19
  • Scape in frontal view with fewer than 10 erect hairs along its posterior margin . . . . . 20

19

return to couplet #18

  • Body and legs brown; body striate or costulate, with abundant decumbent pubescence; subpetiolar process forming a rounded lobe, without sharp angles in lateral view . . . . . Gnamptogenys ejuncida
  • Body black and legs ferruginous; body usually costate, with sparse decumbent pubescence; subpetiolar process usually with a sharp anterior angle, blunt in Central American specimens . . . . . Gnamptogenys porcata
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Profile of Gnamptogenys porcata worker

20

return to couplet #18

  • Tibiae and scapes with 1 or no semi-erect or semi-decumbent hairs . . . . . Gnamptogenys extra
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Profile of Gnamptogenys extra worker

21

return to couplet #20

  • Propodeal declivity with transverse costulae; petiolar node slightly pedunculate . . . . . Gnamptogenys pleurodon
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Profile of Gnamptogenys pleurodon worker
Profile of Gnamptogenys nigrivitrea worker

22

return to couplet #15

  • Postpetiolar sternite with well-defined costulae or striae; propodeal dorsum not depressed below level of mesonotum in lateral view; dorsal and declivitous propodeal faces confluent in lateral view . . . . . 23
  • Postpetiolar sternite with weakly-defined rugulae; propodeal dorsum depressed below level of mesonotum in lateral view; dorsal and declivitous propodeal faces separated by ridge in lateral view . . . . . Gnamptogenys pittieri
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Profile of Gnamptogenys pittieri worker

23

return to couplet #22

  • Scape with moderate to scarce pubescence, with 5 or more erect hairs . . . . . 24
Head of Gnamptogenys ilimani worker
Profile of Gnamptogenys ilimani worker

24

return to couplet #23

Head of Gnamptogenys strigata worker
Profile of Gnamptogenys strigata worker

25

return to couplet #1

  • Scape not reaching the preoccipital margin in dorsal view . . . . . 26
  • Scape surpassing preoccipital margin by at least one apical width . . . . . 42

26

return to couplet #25

  • Mandibular dorsum usually with striae, costulae or rugulae on one-fourth, or more, of its length (sometimes less in hartmanni) . . . . . 27
  • Mandibular dorsum totally smooth and shining, with sparse punctures . . . . . 29

27

return to couplet #26

  • Body with regular striae or costulae; mandibles triangular or semi-triangular; not found in Antilles . . . . . 28

28

return to couplet #27

  • Metacoxal dorsum unarmed; eye small (OI < 0.1); mandibular dorsal surface densely striate . . . . . Gnamptogenys haenschi (in part)
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Profile of Gnamptogenys haenschi worker
  • Metacoxal dorsum with lobe; eye large (OI > 0.2); mandibular dorsal surface costulate on basal fourth or less, the rest smooth and shining . . . . . Gnamptogenys hartmani (in part)

29

return to couplet #26

  • Propodeal dorsum mostly longitudinally striate or costulate . . . . . 32

30

return to couplet #29

  • Head subquadrate in dorsal view (CI > 0.78); body brown to dark brown . . . . . 31
Head of Gnamptogenys alfaroi worker
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31

return to couplet #30

  • Mesosoma and petiole costulate; both propodeum and metacoxal dorsum edentate . . . . . Gnamptogenys kempfi
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Profile of Gnamptogenys kempfi worker
  • Mesosoma and petiole finely striate; both propodeum and metacoxal dorsum dentate . . . . . Gnamptogenys annulata
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Profile of Gnamptogenys annulata worker

32

return to couplet #29

  • Clypeal lamella laterally rounded in dorsal view, never angular; subpetiolar process usually rounded in lateral view, rarely with a posterior tooth . . . . . 33
  • Clypeal lamella with sharp lateral angles; subpetiolar process with a posterior tooth in lateral view . . . . . 39

33

return to couplet #32

  • Mandible semi-triangular to semi-falcate in dorsal view; metanotal groove well-defined . . . . . 34

34

return to couplet #33

  • Metacoxal dorsum unarmed, at most with a low tubercle or swelling . . . . . 35

35

return to couplet #34

  • Body striate; clypeal lamella laterally with blunt angles in dorsal view, medially anteriorly projecting and with a small median concavity . . . . . Gnamptogenys stellae
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Profile of Gnamptogenys stellae worker
  • Body costulate; clypeal lamella with a broad median concavity and laterally rounded in dorsal view . . . . . Gnamptogenys simulans
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Profile of Gnamptogenys simulans worker

36

return to couplet #34

  • Metacoxal dorsum with a low triangular lobe; HW < 1.12 mm, WL < 1.81 mm . . . . . 37
  • Metacoxal dorsum with a slender and parallel-sided lobe or tooth; HW > 1.12, WL > 1.81 mm . . . . . Gnamptogenys mordax
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Profile of Gnamptogenys mordax worker

37

return to couplet #36

  • Propodeal spiracle separated from declivity by less than its diameter in lateral view . . . . . Gnamptogenys wilsoni
  • Propodeal spiracle separated from declivity by more than its diameter . . . . . 38

38

return to couplet #37

  • Cephalic dorsum striate; propodeal declivity inclined and relatively straight in lateral view; with weakly developed lateral lobes . . . . . Gnamptogenys boliviensis
Profile of Gnamptogenys boliviensis worker
  • Cephalic dorsum costulate; propodeal declivity with a posterior concavity formed by well developed anterolateral lobes . . . . . Gnamptogenys continua
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Profile of Gnamptogenys continua worker

39

return to couplet #32

  • Metanotal groove well-defined, visible in any angle; subpetiolar process without a posterior tooth in lateral view . . . . . 40
  • Metanotal groove weakly defined, visible only in limited angles; subpetiolar process with posterior tooth in lateral view . . . . . 41

40

return to couplet #39

  • Anterior margin of clypeal lamella straight in dorsal view; metacoxal dorsum with a lobe . . . . . Gnamptogenys rimulosa
  • Anterior margin of clypeal lamella with a bluntly angular concavity; metacoxal dorsum unarmed . . . . . Gnamptogenys biquetra

41

return to couplet #39

  • Propodeal declivity with longitudinal costulae that converge posteriorly; anterior face of petiolar node transversely costulate; mesometapleural suture absent or weakly impressed . . . . . Gnamptogenys horni
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Profile of Gnamptogenys horni worker
  • Propodeal declivity with parallel longitudinal costulae; most of anterior face of petiolar node longitudinally costulate, but frequently with a basal strip of transverse costulae that occasionally covers all of anterior face; mesometapleural suture well-impressed . . . . . Gnamptogenys regularis
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Profile of Gnamptogenys regularis worker

42

return to couplet #25

  • Mandible elongate, falcate or semi-falcate in dorsal view, with just the apex touching or overlapping the opposite mandible when totally closed . . . . . 43
  • Mandible triangular or semi-triangular in dorsal view, with a fourth or more of the masticatory border overlapping the opposite mandible when closed . . . . . 48

43

return to couplet #42

  • Propodeal declivity with teeth or denticles; metacoxal dorsum with tooth; mostly continental species . . . . . 44
  • Propodeal declivity rounded, without teeth or denticles; metacoxal dorsum unarmed; endemic to Hispaniola . . . . . 47
  • Propodeal declivity with teeth or denticles; metacoxal dorsum unarmed; Cuban endemic . . . . . Gnamptogenys rumba
Head of Gnamptogenys rumba worker
Profile of Gnamptogenys rumba worker

44

return to couplet #43

  • Mandible with short triangular tooth on basal internal margin . . . . . 45
Head of Gnamptogenys mediatrix worker
Profile of Gnamptogenys mediatrix worker

45

return to couplet #44

  • Clypeus with a lobe anterior to each antennal fossa; each lobe partially covers the clypeal lamella in dorsal view; mesonotal spiracle in depression below level of surrounding integument . . . . . Gnamptogenys laticephala
  • Clypeus without lobes between antennal fossae and lamella; mesonotal spiracles at same level as surrounding integument . . . . . 46

46

return to couplet #45

  • Antennal scape surpasses posterior cephalic margin by at least twice its maximum width; preoccipital lamella visible, with a median convexity in cephalic dorsal view . . . . . species C
  • Antennal scape surpasses posterior cephalic margin by no more than one maximum diameter . . . . . Gnamptogenys banksi
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Profile of Gnamptogenys banksi worker

47

return to couplet #43

  • Mandible elongate and slender; propodeal dorsal surface with smooth transverse costulate . . . . . Gnamptogenys schmitti
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Profile of Gnamptogenys schmitti worker
  • Mandible shorter and thicker; propodeal dorsal surface with vermiculate longitudinal costulae . . . . . Gnamptogenys semiferox
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Profile of Gnamptogenys semiferox worker

48

return to couplet #42

  • Mandibular dorsal surface mostly smooth and shining, sometimes with striae or costulae extending not beyond the basal third; mesosomal dorsum usually without transverse sutures, if otherwise, then the ant is ferruginous and finely striate . . . . . 49
  • Mandibular dorsal surface mostly striate or rugulose; metanotal groove well-impressed . . . . . 62

49

return to couplet #48

50

return to couplet #49

  • Mesosoma costulate; metacoxal dorsum with dorsal tooth; apex of petiolar node ending in a blunt angle in lateral view; body black . . . . . Gnamptogenys tortuolosa
Profile of Gnamptogenys tortuolosa worker
  • Mesosoma striate; metacoxal dorsum unarmed; apex of petiolar node ending in a blunt point; body ferruginous . . . . . Gnamptogenys concinna
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Profile of Gnamptogenys concinna worker

51

return to couplet #49

  • Mesosoma striate; propodeal declivity with lateral longitudinal crests distinct from mesosomal striae . . . . . 52
  • Mesosoma costulate; propodeal declivity without crests distinct from mesosomal striae . . . . . 53

52

return to couplet #51

Head of Gnamptogenys bruchi worker
Profile of Gnamptogenys bruchi worker

53

return to couplet #51

  • Posterior face of petiolar node transversely costulate . . . . . 54
  • Posterior face of petiolar node longitudinally costulate . . . . . 58

54

return to couplet #53

  • Clypeal lamella laterally angular; mandible semi-triangular, the internal and masticatory margins united by a broad convexity . . . . . 55
  • Clypeal lamella laterally rounded; mandible triangular, the internal and masticatory margins separated by an angle . . . . . 57

55

return to couplet #54

  • Petiolar node with a pointed apex in lateral view; propodeal declivity longitudinally costulate; body uniform brown . . . . . Gnamptogenys acuminata
Profile of Gnamptogenys acuminata worker
  • Petiolar node sometimes with a posterior projection but never pointed; propodeal declivity usually transversely costulate, rarely longitudinal; color variable, usually with both brown and ferruginous parts, rarely totally brown . . . . . 56

56

return to couplet #55

  • Metacoxal tooth absent or vestigial; propodeal declivity without lateral lobes; body dark brown to bicolored . . . . . Gnamptogenys sulcata
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Profile of Gnamptogenys sulcata worker
  • Small metacoxal tooth present; propodeum with small lateral lobes; body yellow . . . . . Gnamptogenys flava

57

return to couplet #54

  • Metacoxal dorsum with a lobe; clypeal lamella with two convexities; petiolar node with dorsal and posterior margins forming approximately a right angle in lateral view . . . . . Gnamptogenys transversa
  • Metacoxal dorsum unarmed; clypeal lamella with a single convexity; petiolar node with an apical point that overhangs the posterior margin . . . . . Gnamptogenys fernandezi
Profile of Gnamptogenys fernandezi worker

58

return to couplet #53

  • Clypeal lamella laterally rounded or obtusely angular . . . . . 60

59

return to couplet #58

  • HW < 1.1 mm; WL < 1.7 mm; clypeal lamella with a straight anterior margin . . . . . Gnamptogenys ericae
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Profile of Gnamptogenys ericae worker
Profile of Gnamptogenys curvoclypeata worker

60

return to couplet #58

  • Propodeal declivity longitudinally costulate; clypeal lamella straight medially and rounded laterally in frontal view; mandible semi-triangular, the internal and masticatory margins united by a broad convexity . . . . . 61
  • Propodeal declivity transversely costulate; clypeal lamella medially concave, laterally convex laterally; mandible triangular, the internal and masticatory margins separated by an angle . . . . . Gnamptogenys volcano
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Profile of Gnamptogenys volcano worker

61

return to couplet #60

  • Petiolar node with a more or less convex dorsal margin in lateral view; metacoxal dorsum with an acute tooth; subpetiolar process with sharp angles . . . . . Gnamptogenys lucaris
  • Petiolar node with a straight dorsal margin; metacoxal dorsum with a triangular tooth; subpetiolar process with blunt angles . . . . . Gnamptogenys siapensis

62

return to couplet #48

  • Scape usually smooth and shining with sparse punctulae . . . . . 63
  • Scape rugulose or striate (sculpture sometimes attenuated) . . . . . 69

63

return to couplet #62

  • Mandibular dorsal surface striate or rugulose; metacoxal dorsum toothed . . . . . 64

64

return to couplet #63

  • Masticatory margin of mandible with distinct denticles . . . . . 65
  • Masticatory margin of mandible edentate or with indistinct denticulation . . . . . 66

65

return to couplet #64

Head of Gnamptogenys lineolata worker
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Profile of Gnamptogenys ingeborgae worker

66

return to couplet #64

  • Scape surpasses posterior cephalic margin by at least twice its apical width; HW > 1.1 mm; WL > 1.6 mm . . . . . 67
  • Scape surpasses posterior cephalic margin by not more than its apical width; HW < 1.1 mm; WL < 1.6 mm . . . . . Gnamptogenys rastrata

67

return to couplet #66

68

return to couplet #67

  • Propodeal tooth longer than diameter of propodeal spiracle; subpetiolar process projecting anteriorly as a triangular lobe in lateral view . . . . . Gnamptogenys enodis (in part)
  • Propodeal tooth shorter than diameter of propodeal spiracle; subpetiolar process subquadrate . . . . . Gnamptogenys menozzii
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Profile of Gnamptogenys menozzii worker

69

return to couplet #62

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Profile of Gnamptogenys haenschi worker

70

return to couplet #69

  • Anterior pronotal margin with at least 5 rugulae or transverse costulae; eyes prominent and protruding . . . . . 71
  • Anterior pronotal margin with longitudinal costulae; eyes not prominent nor protruding, relatively flat . . . . . Gnamptogenys triangularis
Profile of Gnamptogenys triangularis worker

71

return to couplet #70

  • Cephalic vertex with 4 - 5 transverse costulae; anterior half of postpetiolar tergite rugose . . . . . 72
  • Vertex longitudinally costulate; anterior half of postpetiolar tergite longitudinally costulate . . . . . 73

72

return to couplet #71

  • Propodeal teeth at least as long as the distance between their bases; body ferruginous . . . . . Gnamptogenys bispinosa
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Profile of Gnamptogenys bispinosa worker
Head of Gnamptogenys perspicax worker
Profile of Gnamptogenys perspicax worker

73

return to couplet #71

Profile of Gnamptogenys cuneiforma worker
  • Longitudinal costulae from the metanotum to the propodeum, partially effaced on the propodeal declivity . . . . . 75

74

return to couplet #73

  • Pronotum longitudinally costulate; subpetiolar process rectangular in lateral view . . . . . Gnamptogenys mecotyle
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Profile of Gnamptogenys mecotyle worker
  • Pronotum with anterior strip of transverse costulae; subpetiolar process shaped a modest lobe, without angles . . . . . Gnamptogenys enodis (in part)

75

return to couplet #1

  • Body integument opaque or shiny; sculpturing granulose to finely striolate with variable degrees of areolae / foveolae; clypeus without an anteromedian denticle . . . . . 76
  • Body integument shiny, never opaque; sculpturing rugulose to costulate; clypeus with an anteromedian denticle . . . . . 81

76

return to couplet #75

  • Integument mostly opaque, sculpturing predominantly granulose with variable degrees of areolae / foveolae . . . . . 77
  • Integument mostly shiny or silky, sculpturing can be finely striolate or smooth with variable degrees of areolae / foveolae . . . . . 79

77

return to couplet #76

  • Mandible falcate, masticatory margin edentate and concave (north-central Venezuela) . . . . . Gnamptogenys fieldi
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Profile of Gnamptogenys fieldi worker
  • Mandible triangular, masticatory margin fairly straight and denticulate or crenulate . . . . . 78

78

return to couplet #77

  • Metanotal groove well-impressed; spiracles of abdominal segments I and II shining and conspicuous (northwestern Venezuela) . . . . . Gnamptogenys petiscapa
  • Metanotal groove absent; spiracles of abdominal segments I and II opaque and not conspicuous (southern Mexico - Brazil) . . . . . Gnamptogenys minuta
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Profile of Gnamptogenys minuta worker

79

return to couplet #76

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Profile of Gnamptogenys falcifera worker

80

return to couplet #79 return to couplet #5

  • Eye not prominent, broadly convex; anterior clypeal margin broadly convex; occipital lobe rounded (southern Mexico - Costa Rica) . . . . . Gnamptogenys simulans
  • Eye prominent, semispherical; anterior clypeal margin medially concave; occipital lobe subangular (eastern Ecuador) . . . . . Gnamptogenys vriesi

81

return to couplet #75

  • Postpetiolar tergite mostly with arched punctate-rugulae, longitudinally costulate posteromedially; meso- and metatibial spurs present (southwestern Brazil) . . . . . Gnamptogenys striolata
  • Postpetiolar tergite with rough longitudinal costulae; meso- and metatibial spurs absent (Colombia - southern Brazil) . . . . . Gnamptogenys caelata
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Profile of Gnamptogenys caelata worker

Addendum

A 2016 revision of this key (Lattke and Delsinne 2016) inadvertently removed Gnamptogenys interrupta from the key.

Profile of Gnamptogenys interrupta worker