Key to Cylindromyrmex males

This worker key is based on: De Andrade, M. L. 1998a. Fossil and extant species of Cylindromyrmex (Hymenoptera: Formicidae). Revue Suisse de Zoologie. 105:581-664. with revisions as given in De Andrade 2001.

The males of Cylindromyrmex darlingtoni and Cylindromyrmex escobari are not considered because they are not yet known. Cylindromyrmex whymperi and Cylindromyrmex striatus are not separated because the unique specimen of striatus available for the present study is immature and does not allow a sure recognition of diagnostic characters.

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1

• Frontal carinae strongly converging and almost touching each other posteriorly and broadly separated anteriorly . . . . . 2

• Frontal carinae not strongly converging posteriorly, if almost touching each other posteriorly (few males of brevitarsus) then never broadly separated anteriorly . . . . . 3

2

return to couplet #1

• Total length TL > 9.5 cm. Mesosoma massive. Petiole with traces of striae only anteriorly. Postpetiole smooth. Costa Rica, Panama, Ecuador . . . . . Cylindromyrmex godmani

• Total length (TL) < 8.5 cm. Mesosoma elongate. Petiole entirely striate. Postpetiole superficially striate. Costa Rica, Panama, Venezuela, Brazil . . . . . Cylindromyrmex meinerti

3

return to couplet #1

• Hypopygium smooth, finely denticulate or with a simple median projection between the distal apodemes . . . . . 4

• Hypopygium with a bidentate median projection between the apodemes . . . . . 6

4

return to couplet #3

• Postpetiole and first gastric tergite sculptured. Masticatory margin of the mandibles with a basal tooth. CI = 85.2. Hypopygium with a simple median projection between the distal apodemes. Brazil . . . . . Cylindromyrmex longiceps

• Postpetiole and first gastric tergite smooth. Masticatory margin of the mandibles without a basal tooth. CI > 95.2. . . . . 5

5

return to couplet #4

• Anterior clypeal border slightly convex. Hypopygium finely denticulate between the distal apodeme. Brazil and Paraguay . . . . . Cylindromyrmex brasiliensis

• Anterior clypeal border straight. Hypopygium smooth between the distal apodemes. Guatemala, Costa Rica, Columbia, Galapagos Island, Ecuador, Peru, Bolivia, Chile, Brazil . . . . . Cylindromyrmex whymperi

• Surinam, French Guyana, Brazil . . . . . Cylindromyrmex striatus

6

return to couplet #3

• Coxae black with the remaining parts of the legs yellow to light brown. Ventral border of the aedeagus with at least 42 denticles. Costa Rica, Venezuela, Ecuador, Peru and Brazil . . . . . Cylindromyrmex brevitarsus

• Coxae dark or black, concolour with the remaining parts of the legs. Ventral border of the aedeagus with at most 32 denticles. Colombia, Venezuela, Peru and Bolivia . . . . . Cylindromyrmex boliviae