Key to Lenomyrmex workers

This worker key is based on: [[Media:Delsinne & Fernandez 2011.pdf|Delsinne, T. & Fernández, F. 2011. First record of Lenomyrmex inusitatus in Ecuador and description of the queen. Psyche 2012:5pages (doi: 10.1155/2012/145743.) PDF]]

The myrmicine ant genus Lenomyrmex is comprised of six rarely collected species that occur from Costa Rica to Ecuador. Lenomyrmex possesses both primitive (e.g., promesonotal suture well developed) and derived (e.g., specialized morphology of the mandibles) characters.

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 * Lenomyrmex
 * Key to Lenomyrmex queens

1

 * Mesosoma predominantly smooth and shiny, with no erect hairs . . . . . 2


 * Mesosoma with conspicuous sculpture and at least a pair of erect hairs . . . . . 3

2
return to couplet #1
 * Propodeum without spines; head only foveolate (SW Colombia) . . . . . Lenomyrmex foveolatus


 * Propodeum with a pair of acute and well-defined spines; head foveolate, with median longitudinal striae (Cordillera Oriental of the Andes in S Colombia and S Ecuador) . . . . . Lenomyrmex inusitatus

3
return to couplet #1
 * Dorsum of head and petiole with longitudinal conspicuous costae; erect hairs of antennal scape as long as or longer than maximum diameter of scape; body ferruginous yellow (W. Panama) . . . . . Lenomyrmex costatus


 * Dorsum of head densely rugo-reticulate; sculpture of the petiole variable, rugulate to rugo-reticulate or longitudinally striate but never costate; erect hairs of antennal scape not longer than maximum diameter of the scape; body brownish black or dark red brown . . . . . 4

4
return to couplet #3
 * Length of propodeal spines approximately equal to distance between their bases; mesopleuron with some irregular longitudinal striae, but mostly smooth and shiny; metapleuron with irregular longitudinal striae; HL > 0.80 mm; mesosoma with only two suberect hairs on the pronotum (SW Colombia) . . . . . Lenomyrmex mandibularis


 * Length of propodeal spines variable, either shorter or longer than distance between their bases; metapleuron and subsequent portion of mesopleuron with fine transverse rugulae or rugo-reticulate, without smooth areas; HL < 0.80 mm; mesosoma with numerous erect to suberect hairs . . . . . 5

5
return to couplet #4
 * Propodeal spines shorter than distance between their bases; eyes with six or seven facets in maximum diameter; petiolar node protruding over the peduncle and well defined; postpetiolar dorsum with longitudinal striae (NW Ecuador, SWColombia) . . . . . Lenomyrmex wardi


 * Propodeal spines longer than distance between their bases; eyes with about nine facets in maximum diameter; petiolar node undifferentiated from the peduncle; postpetiolar dorsum smooth and polished (Costa Rica) . . . . . Lenomyrmex colwelli