Key to Sphinctomyrmex

This worker key is based on: [[Media:Feitosa et al 2012.pdf|Feitosa, R.M., C.R.F. Brandão, F. Fernández and J.C.H. Delabie. 2012. The Ant Genus Sphinctomyrmex Mayr (Hymenoptera, Formicidae, Cerapachyinae) in the Neotropical Region, with the Description of Two New Species. Psyche Volume 2012, Article ID 342623, 9 pages PDF]]

This moderately diverse genus ( species) has but three representatives in the New World.

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Sphinctomyrmex

1

 * Size relatively small (HW <0.40mm); head notably elongate (CI <70); dorsum of mesosoma with a median longitudinal smooth stripe (Brazil: AM) . . . . . Sphinctomyrmex marcoyi


 * Size relatively large (HW >0.40mm); head moderately elongate to subquadrate (CI >70); dorsum of mesosoma without a median longitudinal smooth stripe . . . . . 2

2
return to couplet #1
 * Head slightly to considerably elongate; clypeus narrowly inserted between the frontal lobes, so that the frontal carinae are placed close to each other; lateral lobes of the anterior margin of clypeus absent or vestigial; abdominal segments IV to VII with comparatively short pretergites; gastral dorsum devoid of appressed hairs (Brazil: BA, MG, RJ, SC, SP) . . . . . Sphinctomyrmex stali


 * Head distinctly subquadrate; clypeus broadly inserted between the frontal lobes, so that the frontal carinae are well separated from each other; anterior margin of clypeus with two lateral lobes projecting over the mandibles; abdominal segments IV to VII with strongly developed pretergites; gastral dorsum with short appressed hairs (Brazil: MG) . . . . . Sphinctomyrmex schoerederi