Key to Camponotus Myrmostenus Queens

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This worker key is based on: MacKay, W.P. 1997. A revision of the Neotropical ants of the genus Camponotus, subgenus Myrmostenus. Proceedings of the Entomological Society of Washington. 99:194-203.. This key is in English and Spanish.

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1

  • Ventral surface of head with more than 5 erect hairs (Figs. 1, 2); occipital corners of head rounded (Figs. 4, 7 , 8) . . . . . 2
  • Ventral surface of head without erect hairs, or rarely with 1 or 2 present; occipital corners of head angulate (Figs. 5, 6) . . . . . 5

2

return to couplet #1

  • Surface of clypeus usually without any erect hairs (Fig. 7), although there may be occasional erect hairs along the borders (Fig. 5) . . . . . 3
Figs. 1- 8. Females of Camponorus (Myrmostenus); scales are 0.2 mm. 1, C. (M.) longipilis, lectotype from the side. 2, C. (M.) leptocephalus, lectotype head, mesosoma, and petiole. 3, Clypeus of the 6 species, as seen from the top. 4, Head of C. (M.) convexiclypeus, holotype. 5, C. (M.) mirabilis, head of lectotype. 6, C. (M.) postangulatus, holotype head (b indicates clypeal width measurement). 7, C. (M.) spenocephalus, holotype head. 8, C. (M.) leptocephalus. lectotype head (a indicates clypeal length measurement). Figs. 1- 8. Hembras de Camponotus (Myrmostenus); las escalas son de 0.2 mm. 1, C. (M.) longipilis lectotipo desde el lado. 2, C. (M.) leptocephalus cabeza, mesosoma y peciolo del lectotipo. 3, Clypeus de las 6 especies. 4, Cabeza de C. (M.) convexiclypeus holotipo. 5, C. (M.) mirabilis cabeza dellectotipo. 6, C. (M ) postangulatus cabeza del holotipo. 7, C. (M.) spenocephalus cabeza del holotipo. 8, C. (M.) leptocephalus cabeza dellectotipo.

3

return to couplet #2

  • Head strongly narrowed posteriorly, the minimum posterior width less than the distance between eyes (Fig. 7) . . . . . Camponotus sphenocephalus
  • Head not strongly narrowed posteriorly (Figs. 4, 8), or minimum posterior width much greater than distance between eyes, nearly as wide as width of head anterior to eyes (Fig. 6) . . . . . 4

4

return to couplet #3

  • Head relatively wide, CI > 60 (Fig. 4); scape long, SI > 85; eye large, maximum diameter > 0.85mm . . . . . Camponotus convexiclypeus
  • Head narrowed, CI < 60 (Fig. 6); scape shorter, SI < 85; eye diameter smaller, maximum diameter < 0.85mm . . . . . Camponotus longipilis

5

return to couplet #1

  • Head greatly elongate (CI 40-44) with strongly formed occipital angles (Fig. 5); relatively commonly collected . . . . . Camponotus mirabilis
  • Head not greatly elongate (Cl 55), occipital angles poorly formed (Fig. 6); rarely collected . . . . . Camponotus postangulatus


1s

  • Superficie ventral de la cabeza con 5 o mas pelos rectos (Figs. 1, 2); esquinas occipitales de la cabeza redondas (Figs. 4, 7, 8) . . . . . 2
  • Superficie ventral de la cabeza sin pelos rectos ; esquinas occipitales anguladas (Figs. 5, 6) . . . . . 5

2s

return to couplet #1s

  • Superficie del clfpeo usualmente sin pelos rectos (Fig. 7), aunque podria tener pelos rectos al margen (Fig. 5) . . . . . 3

3s

return to couplet #2s

  • Cabeza muy angosta atras, la anchura posterior me nos que la distancia entre los ojos (Fig. 7) . . . . . Camponotus sphenocephalus
  • Cabeza no muy angosta atras (Figs. 4, 8), o la anchura posterior casi tan ancha como la anchura inmediamente detnis de los ojos (Fig. 6) . . . . . Camponotus longipilis

4s

return to couplet #3s

  • Cabeza no muy angosta (indice cefalico > 60, Fig. 4); escape largo (indice del escapo > 85); diametro maximo del ojo > 0.85mm . . . . . Camponotus convexiclypeus
  • Cabeza angosta (indice ce falico < 60, Fig. 6); escape mas corto (indice del escape < 85); diametro maximo del ojo < 0.85mm . . . . . Camponotus longipilis

5s

return to couplet #1s

  • Cabeza muy elongada (CI 40-44), con angules bien formados en las esquinas occipitales (Fig. 5); relativemente comun . . . . . Camponotus mirabilis
  • Cabeza no demasiada elongada (Cl 55), con angulos poco diferenciados en las esquinas occipitales (Fig. 6); no comunes . . . . . Camponotus postangulatus