Key to minor workers of the Malagasy Camponotus, subgenus Myrmosaga

This key to the minor workers of the Malagasy Camponotus, subgenus Myrmosaga, is based on Rakotonirina & Fisher (2022).

1

 * With head in full-face view, eyes not breaking lateral cephalic margins (Fig. 2A)
 * With head in full-face view, eyes breaking lateral cephalic margins (Fig. 2B), if not then lateral cephalic margin diverging posteriorly (Fig. 2C)

2

 * Dorsal margin of propodeum entirely straight (Fig. 3A)
 * Dorsal margin of propodeum with blunt angle at ca. posterior 1/2 (Fig. 3B)

3

 * Propodeal dorsum 3 × as long as the declivity; petiolar node with dorsal margin as long as posterior margin (Fig. 4A) Camponotus aina
 * Propodeal dorsum 2 × as long as the declivity; petiolar node with dorsal margin shorter than posterior margin (Fig. 4B) Camponotus joany

4

 * With mesosoma in lateral view, junction of mesonotum and anterior 1/2 of propodeum continuously straight, sloping down to make noticeable angle with posterior 1/2 of propodeum; petiolar node low and long (Fig. 5A) Camponotus karsti
 * With mesosoma in lateral view, mesonotum and anterior 1/2 of propodeum forming separate convexities; petiolar node ca. as high as long (Fig. 5B) Camponotus harenarum

5

 * With head in full-face view, lateral cephalic margins converging posteriorly towards eye level (Fig. 6A)
 * With head in full-face view, lateral cephalic margin either approximately parallel or diverging posteriorly towards eye level (Fig. 6B, C)

6

 * Two apical teeth of mandible normally spaced (Fig. 7A); clypeus with anterolateral corner
 * Two apical teeth of mandible closely spaced (Fig. 7B); clypeus without anterolateral corner, lateral and anteromedian margin continuously forming broad convexity

7

 * With head in full-face view, anteromedian margin of clypeus broadly convex (Fig. 8A)
 * With head in full-face view, anteromedian margin of clypeus either generally straight (Fig. 8B) or medially excised (Fig. 8C)

8

 * With head in full-face view, lateral cephalic margin anterior to eye level without erect hairs (Fig. 9A) Camponotus sambiranoensis
 * With head in full-face view, lateral cephalic margin anterior to eye level covered with erect hairs (Fig. 9B)

9

 * With head in full-face view, level of posterior ocular margin located approximately at posterior 1/4 of the length of head; antennal scape with appressed hairs (Fig. 10A) Camponotus niavo
 * With head in full-face view, level of posterior ocular margin located at posterior 1/3 of the length of head; antennal scape with suberect hairs (Fig. 10B) Camponotus cervicalis

10

 * Anteromedian margin of clypeus noticeably excised medially (Fig. 11A) Camponotus lokobe
 * Anteromedian margin of clypeus straight (Fig. 11B)

11

 * Lateral cephalic margin posterior to eye level covered with erect hairs (Fig. 12A); larger size (CS: 1.97±0.19; 1.66–2.26; ML: 4.23±0.39; 3.56–4.81) Camponotus dufouri
 * Lateral cephalic margin posterior to eye level without erect hairs (Fig. 12B); smaller size (CS: 1.57±0.01; 1.56–1.58; ML: 3.26±0.01; 3.21–3.31) Camponotus tendryi

12

 * Lateral cephalic margin posterior to eye level without erect hairs (Fig. 13A) Camponotus bemaheva
 * Lateral cephalic margin posterior to eye level covered with erect hairs (Fig. 13B)

13

 * Integument of entire body yellowish orange to reddish orange (Fig. 14A) Camponotus daraina
 * Head and gaster reddish black and mesosoma reddish orange or integument entirely reddish black (Fig. 14B) Camponotus roeseli

14

 * In full-face view, lateral margin of head anterior to eye level approximately parallel and covered with erect hairs (Fig. 15A)
 * In full-face view, lateral margin of head anterior to eye level diverging posteriorly (Fig. 15C), if parallel then lacking erect hairs (Fig. 15B)

15

 * With mesosoma in lateral view, mesonotum elongate and constricted at midlength, propodeum broadly convex (Fig. 16A) Camponotus imitator
 * With mesosoma in lateral view, mesonotum short and lacking constriction at midlength; promesonotum an even convexity; propodeal dorsum almost straight (Fig. 16B)

16

 * Two apical teeth of mandible closely spaced (Fig. 17A)
 * Two apical teeth of mandible normally spaced from each other (Fig. 17B)

17

 * Antennal scape covered with erect hairs; lateral cephalic margin posterior to eye level with erect hairs (Fig. 18A); larger in size Camponotus hova
 * Antennal scape covered with appressed hairs (Fig. 18B); lateral cephalic margin posterior to eye level without erect hairs; smaller in size

18

 * In lateral view, mesosoma much higher and short (MPH/ML: 0.34±0.01; 0.31–0.36), propodeal dorsum at most 3 × as long as declivity; petiolar node more or less flattened anteroposteriorly and tapering dorsally (Fig. 19A) Camponotus radamae
 * In lateral view, mesosoma very low and long (MPH/ML: 0.29±0.02; 0.28–0.31), propodeal dorsum at least four times as long as declivity; petiole much nodelike (Fig. 19B) Camponotus vano

19

 * Antennal scape covered with appressed hairs (Fig. 20A) Camponotus mahafaly
 * Antennal scape covered with erect to suberect hairs (Fig. 20B)

20

 * Mesosoma generally short and high, its dorsal outline strongly convex, propodeal dorsum < 2 × height of declivity surface (Fig. 21A) Camponotus cemeryi
 * Mesosoma low and long, its dorsal outline more or less straight or not strongly convex, propodeal dorsum 2 × or more as long as height of declivity surface (Fig. 21B)

21

 * In lateral view, dorsum of mesosoma from mid-mesonotum to posterodorsal corner of propodeum approximately straight, propodeal dorsum ca. 3 × as long as height of declivity surface (Fig. 22A) Camponotus hovahovoides
 * In lateral view, posterior 1/2 of mesonotum to posterodorsal corner of propodeum slightly convex, propodeal dorsum ca. 2 × as long as height of declivity surface (Fig. 22B)

22

 * Antennal scape covered with suberect hairs inclined at ca. 30° (Fig. 23A); larger species (CS: 1.59±0.10; 1.36–1.75; ML: 3.10±0.16; 2.76–3.45) Camponotus mixtellus
 * Antennal scape covered with suberect hairs inclined at ca. 45° (Fig. 23B); smaller species (CS: 1.15±0.06; 1.00–1.27; ML: 2.11±0.10; 1.87–2.28) Camponotus boivini

23

 * With head in full-face view, lateral margins of head anterior to eye level parallel to each other (Fig. 24A)
 * With head in full-face view, lateral margins of head anterior to eye level diverging posteriorly (Fig. 24B)

24

 * In full-face view, clypeus with distinctly visible anterolateral corner (Fig. 25A)
 * In full-face view, clypeus without visible anterolateral corner, lateral and anteromedian clypeal margin continuously forming broad convexity (Fig. 25B)

25

 * Dark body color, or posterior portion of mesosoma pale brown; in lateral view, petiolar node scalelike or more or less compressed anteroposteriorly (Fig. 26A)
 * Pale yellow to orange body color; in lateral view, petiole nodelike and not compressed anteroposteriorly (Fig. 26B)

26

 * With head in full-face view, anteromedian clypeal margin truncate; erect hairs present on lateral cephalic margin behind level of posterior ocular margin (Fig. 27A) Camponotus becki
 * With head in full-face view, anteromedian clypeal margin broadly convex or triangular; erect hairs absent on lateral cephalic margin behind level of posterior ocular margin (Fig. 27B)

27

 * In lateral view, mesosoma low and long, propodeal dorsum ca. 3 × as long as declivity, their junction rounded; petiolar node with dorsal margin inclined posteriorly; integument matte (Fig. 28A) Camponotus asara
 * In lateral view, mesosoma short and high, length of propodeal dorsum < 2 × height of declivity, their junction angulate; petiolar node scalelike; integument shining (Fig. 28B) Camponotus bozaka

28

 * With head in oblique profile, three pairs of erect hairs arranged successively from level of anterior ocular margin towards posterior cephalic margin (Fig. 30A) Camponotus strangulatus
 * With head in oblique profile, four or more pairs of erect hairs arranged successively from level of anterior ocular margin towards posterior cephalic margin (Fig. 30B)

29

 * With mesosoma in profile, junction of propodeal dorsum and declivity surface rounded (Fig. 30A) Camponotus atimo
 * With mesosoma in profile, junction of propodeal dorsum and declivity surface broadly angulate (Fig. 30B) Camponotus tapia

30

 * In full-face view, posterior portion of head extending into broadly short neck (Fig. 31A); in profile, entire propodeal dorsum more or less straight and separated from declivity surface by broad angle Camponotus gouldi
 * In full-face view, posterior portion of head normally rounded, not extending into a short neck (Fig. 31B); in profile, propodeal dorsum immediately posterior to metanotal groove convex, then concave medially and rounding to declivity surface Camponotus aro

31

 * With head in full-face view, lateral margin of head anterior to eye level with erect hairs (Fig. 32A); head and gaster black, mesosoma reddish orange to brown
 * With head in full-face view, lateral margin of head anterior to eye level without erect hairs (Fig. 32B); body color uniquely black, brown to yellowish orange

32

 * With head in full-face view, anterior clypeal margin broadly triangular (Fig. 33A); mesosoma in profile short and high; gastral tergites covered with abundant pubescence Camponotus aurosus
 * With head in full-face view, anterior clypeal margin truncate (Fig. 33B); mesosoma in profile low and long; gastral tergites without abundant pubescence Camponotus hagensii

33

 * With head in full-face view, anterior clypeal margin broadly triangular (Fig. 34A) Camponotus liandia
 * With head in full-face view, anterior clypeal margin truncate (Fig. 34B)

34

 * No white spot on dorsum of second and third abdominal tergites (Fig. 35A)
 * One pair of white spots on third abdominal tergites (Fig. 35B)or two pairs of white spots present on second and third abdominal tergites (Fig. 35C)

35

 * With mesosoma in lateral view, propodeal dorsum broadly concave (Fig. 36A) Camponotus immaculatus
 * With mesosoma in lateral view, propodeal dorsum approximately straight (Fig. 36B)

36

 * Eye small (EL/CL: 0.19±0.01; 0.16–0.21) (Fig. 37A); posterior margin of head approximately straight Camponotus kelimaso
 * Eye large (EL/CL: 0.24±0.01; 0.23–0.27) (Fig. 37B); posterior margin of head broadly convex Camponotus lubbocki

37

 * Pronotum, mesonotum, and propodeum forming separate convexities, metanotal groove depressed; propodeum at lower level than promesonotum; petiolar node with dorsal face rounding to anterior and posterior faces (Fig. 38A) Camponotus gibber
 * Pronotum, mesonotum, and propodeum not forming separate convexities, metanotal groove not depressed; propodeum immediately in junction with promesonotum; petiolar node with dorsal face joining posterior face into an angle and rounding to anterior face (Fig. 38B)

38

 * Propodeal dorsum straight (Fig. 39A) Camponotus rotrae
 * Propodeal dorsum concave (Fig. 39B) Camponotus quadrimaculatus