[1] Based on its South American range, it appears that P. triangularis has the potential to spread to forests throughout much of the southeastern United States.

[6] Poneracantha triangularis is a relatively large, black ant with more reddish legs that is characterized by deep longitudinal grooves and ridges that the run the lengths of the head, mesosoma and gaster.

Females are similar in appearance to workers, but are slightly larger (~5.5 mm in length) and have brownish gray colored wings.

Sides of head, pronotum, much of the mesonotum, and gaster have reduced sculpture and are shiny, and the remainder of mesosoma and petiole are rugoreticulate.

Because there are no discernible geographic barriers, it seems very likely that the native range of P. triangularis also extends into forest habitats in French Guiana, Paraguay, and farther north in Central America, but has not yet been recorded in these areas due to its rarity.

Based on its South American range, it is possible that P. triangularis could spread to forests throughout much of the southeastern United States, perhaps as far north as Richmond, Virginia and Lexington, Kentucky.