Trachymyrmex species groups

These groups are based on numerous revisions that each focused on a single species group.

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Trachymyrmex

Iheringi
based on Mayhé-Nunes & Brandão (2005)

species

 * Trachymyrmex cirratus
 * Trachymyrmex holmgreni
 * Trachymyrmex iheringi
 * Trachymyrmex kempfi
 * Trachymyrmex pruinosus

Identification
Key to iheringi species group workers

Diagnosis
Antennal scape armed with a remarkable basal lobe. Funicular segments II -VIII as long as broad. Apical part of the antennal scrobe not marked by carinae nor forming prominent tubera. Frontal lobes moderately expanded laterad, the interfrontal width near 2/3 of the head width across the eyes (FLI 58-66). Preocular carina disappearing a little above the eye. Carina of vertex vestigial. Occipital projections always present. Mandible usually with discal area smooth or, as in some specimens of T. iheringi, the grooves are relatively thin and shallow. Superior border of katepisternum always armed with a projection usually triangular or tooth-like, sometimes inconspicuous.

Jamaicensis
based on Mayhé-Nunes & Brandão (2007)

species

 * Trachymyrmex atlanticus
 * Trachymyrmex haytianus
 * Trachymyrmex isthmicus
 * Trachymyrmex ixyodus
 * Trachymyrmex jamaicensis
 * Trachymyrmex zeteki

Identification
Key to jamaicensis species group workers

Diagnosis
Diagnosis: Monomorphic attine ants with the antennal scrobe margins always reaching and even surpassing the posterior margin of the head; frontal and preocular carinae well marked, subparallel throughout their whole extension, limiting the impressed antennal scrobe; extremities of frontal and preocular carinae always separate and with up to three triangular or rounded compressed tubercles or vertical teeth close to the posterior margin; preocular carina not curved mesad above eyes. Frontal lobes from moderately approximate to moderately expanded laterad, but in most species the interfrontal width near 2/3 of the head width across the eyes (FLI 50–70). Occipital projections (teeth or spines) always present on head. Posterior margin in full-face view smoothly concave, notched in the middle. The paired vertexal carinae indicated by a series of weakly connected piligerous denticles, flanking the shallowly impressed sagital furrow, which in front joins the transverse impression of frons, behind the frontal area. Outer border of mandibles sinuous. Mandibles with discal area smooth and shining, the fine striae confined to the mandibular bases and sides. All funicular segments, including 2nd, longer than broad.

Opulentus
based on Mayhé-Nunes & Brandão (2002)

species

 * Trachymyrmex compactus
 * Trachymyrmex dichrous
 * Trachymyrmex opulentus
 * Trachymyrmex relictus

Identification
Key to Trachymyrmex opulentus species group workers

Diagnosis
Peculiar pilosity, consisting of dense, long, more or less inclined and apically usually not recurved and generally dark hairs, mixed with an extremely low fine and abundant lighter pubescence which is either appressed, or curved or suberect; both types of hairs are evenly distributed on body and appendages, such as in all Sericomyrmex and in some Apterostigma species, although better seen in the apical dorsum of the female hind femora. The midpronotal teeth are lacking or at most vestigial, and the occipital tooth is usually weak and inconspicuous, or sometimes entirely absent. All species of the present group except Trachymyrmex relictus, have very short and rudimentary propodeal spines.