Key to Typhlomyrmex workers

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

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


 * 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


 * 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