Key to Typhlomyrmex workers

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This worker key is based on: Lacau, S., Villemant, C. and Delabie, J. H. C. 2004. Typhlomyrmex meire, a remarkable new species endemic to Southern Bahia, Brazil (Formicidae: Ectatomminae). Zootaxa. 678:1-23. (page 5, pl. 1-5 worker, queen, male described)

Two species, Typhlomyrmex foreli and Typhlomyrmex prolatus, are known only from queens.

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Typhlomyrmex

1

  • Clypeal dome with anterior face vertical or subvertical (head in side view); mandible shape elongated-subtriangular, their basal margins weakly convex, not reaching the anterior clypeal margin at full closure; anterior face of mesotibia with about 10 denticuliform erect setae . . . . . 2
  • Clypeal dome with anterior face sharply inclined posteriorly (head in side view); mandible shape triangular, their basal margins rectilinear or weakly concave, fitting tightly against clypeus at full closure; anterior face of mesotibia without denticuliform setae . . . . . 3

2

return to couplet #1

  • Antennae 12-segmented; clypeal margin straight and totally concealed by the clypeal dome in dorsal view . . . . . Typhlomyrmex clavicornis
  • Antennae 10-segmented; clypeal margin weakly convex medially and only partially concealed by the clypeal dome in dorsal view . . . . . Typhlomyrmex meire
Typhlomyrmex meire casent0915350 h 1 high.jpg
Typhlomyrmex meire casent0915350 p 1 high.jpg

3

return to couplet #1

  • Petiole well pedunculate in lateral view; node poorly developed, longer than high, subconvex at its top and without a distinct posterior face; abdominal tergite III without obvious anterior face; size polymorphism marked . . . . . Typhlomyrmex rogenhoferi
Typhlomyrmex rogenhoferi casent0004700 head 1.jpg
Typhlomyrmex rogenhoferi casent0004700 profile 1.jpg
  • Petiole weakly pedunculate in lateral view; node well developed, higher than long, well rounded at its top and with a distinct posterior face; abdominal tergite III with a distinct anterior face; monomorphic . . . . . 4

4

return to couplet #3

  • Metafemora base (posterior view) sharply swollen ventrally, so that it forms a short vertical face at the base, joining the ventral face by an obtuse and rounded angle; head width >0.55 mm . . . . . Typhlomyrmex major
Typhl JHB01 JHB00662P01 o HFV.jpg
Typhl JHB01 JHB00662P01 o LAT.jpg
  • Metafemora base (posterior view) poorly swollen ventrally, so that it does not form an angle at its base; head width <0.55 mm . . . . . Typhlomyrmex pusillus
Typhlomyrmex pusillus casent0006786 head 1.jpg
Typhlomyrmex pusillus casent0006786 profile 1.jpg