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Species: Pseudomyrmex leptosus   Ward, 1985 

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Taxonomic History (provided by Barry Bolton, 2019)

Pseudomyrmex leptosus Ward, 1985b PDF: 233, figs. 19, 26, 34, 35, 38 (q.m.) U.S.A. Nearctic. AntCat AntWiki HOL


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: United States
  Biogeographic regions (According to curated Bioregion/Taxon lists):

Distribution Notes:

This rare species is restricted to Florida.


Pseudomyrmex leptosus is a workerless social parasite, which has been found only in nests of P. ejectus.


This species is a known only from queens and males. P. leptosus queens differ from those of P. simplex by the possession of a wider, more broadly rounded head (CI  0.77-0.82 in P. leptosus, versus 0.69-0.77 in P. simplex), shorter eyes (REL2 0.59-0.63 in P. leptosus versus 0.65-0.80 in P. simplex), more divergent frontal carinae, and narrower profemur (FI 0.42-0.47 in P. leptosus versus 0.49-0.55 in P. simplex). The differences between P. leptosus and P. pallidus queens are more subtle. All of their measurements and indices overlap, although P. leptosus tends to be smaller and (more importantly) to possess a more broadly rounded head. The most important distinction between the two species lies in the sculpture of the frons and vertex: finely punctate on a predominantly smooth, shiny background in P. leptosus; more coarsely punctate on a sublucid, coriarious background in P. pallidus. Despite some size-related sculptural variation in P. pallidus even the smallest P. pallidus queens possess more strongly developed coriarious sculpture on the head than P. leptosus queens. The postpetiole and gaster of P. leptosus also tend to be shinier than those of P. pallidus. There are slight differences in the male genitalia of the two species, as described in Ward (1985).


Ward, P. S. 1985. The Nearctic species of the genus Pseudomyrmex (Hymenoptera: Formicidae). Quaestiones Entomologicae 21: 209-246.

Specimen Habitat Summary

Found most commonly in these habitats: 1 times found in wetland/pasture edge, 2 times found in pine-palmetto scrub, 1 times found in behind invert lab on fence, 1 times found in Disturbed Flatwoods/Station Grounds.

Found most commonly in these microhabitats: 1 times ex dead Salix twigs, 2 times in Cladium culm, 2 times ex mixed nest of leptosus and ejectus, 1 times in vine, 1 times in nest of pseudomyrmex ejectus in rosa laevigata, 1 times in aster stem, 1 times ex. Mixed nest of leptosus and ejectus.

Collected most commonly using these methods: 1 times search, 2 times lab 08/05/1982.

Elevations: collected at 20 m

Type specimens: paratype: casent0221358, casent0221359; paratype of Pseudomyrmex leptosus: casent0752423, casent0902896, casent0902897

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