Key to Bannapone species

Keys to species of Bannapone based on Eguchi et al. (2015). Note that Bannapone is currently considered to be a junior synonym of Stigmatomma.

Worker Key
Stigmatomma mulanae is excluded from this key because the worker remains unknown.

1

 * Antenna 10-segmented => Stigmatomma fulvidum
 * Antenna 11-segmented => 2

2

 * Mid-basal tooth row of mandible consisting of 2 blunt teeth; frontal lobes relatively distinctly separated by posteromedian portion of clypeus => Stigmatomma scrobiceps
 * Mid-basal tooth row of mandible consisting of 4–5 blunt or truncate teeth; frontal lobes closely approximated => 3

3

 * Mid-basal tooth row consisting of 5 teeth of which basal four almost equal in size; preapical denticle of apical blade of mandible developed well => Stigmatomma pertinax
 * Mid-basal tooth row consisting of 4–5 teeth which decrease in size toward base; preapical denticle of apical blade of mandible absent or reduced => 4

4

 * Frontal carinae conspicuous, reaching vertex; 9th and 10th antennal segments each a little longer than broad; posterolateral part of propodeum strongly produced posteriad => Stigmatomma crypticum
 * Frontal carinae inconspicuous, extending by no more than the length of frontal lobe; 9th and 10th antennal segments each (a little) shorter than broad; posterolateral part of propodeum feebly produced posteriad => 5

5

 * Head distinctly longer than broad => Stigmatomma caliginosum
 * Head as long as broad => Stigmatomma zwaluwenburgi

Queen Key
Stigmatomma fulvidum, Stigmatomma pertinax, Stigmatomma scrobiceps and Stigmatomma zwaluwenburgi are excluded from this key because the queens remain unknown.

1

 * Mid-basal tooth row consisting of 4–5 blunt teeth; distance between median ocellus and lateral ocellus as long as or shorter than that between lateral ocelli => 2
 * Mid-basal tooth row consisting of 2 blunt teeth; distance between median ocellus and lateral ocellus longer than that between lateral ocelli => Stigmatomma mulanae

2

 * Anteromedian portion of clypeus lacking a pair of extremely long and flexible setae; frontal carinae inconspicuous, extending by no more than the length of frontal lobe => Stigmatomma caliginosum
 * Anteromedian portion of clypeus bearing a pair of extremely long and flexible setae; frontal carinae conspicuous, reaching vertex => Stigmatomma crypticum