Gnamptogenys mediatrix

Every Ant Tells a Story - And Scientists Explain Their Stories Here
Jump to navigation Jump to search
Gnamptogenys mediatrix
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. mediatrix
Binomial name
Gnamptogenys mediatrix
Brown, 1958

Gnamptogenys mediatrix P casent0281839.jpg

Gnamptogenys mediatrix D casent0281839.jpg

Specimen Label

Apparently of lowland forests, one series taken from a varzea habitat. Its morphology puts it within the rastrata group, and it is quite probably a millipede hunter.


A member of the banksi complex (in the banksi subgroup of the rastrata species group). Mandibles elongate and triangular, their basal 2/3 rugulose and a pical 1/3 smooth and shining; clypeal lamella medianly concave; scapes with no erect hairs; petiolar costulation mostly transverse, node broader than long; metacoxal teeth very slender, propodeal teeth short. Rarely collected, it is a close relative of Gnamptogenys laticephala. (Lattke 1995)

Keys including this Species


Distribution based on Regional Taxon Lists

Neotropical Region: Brazil (type locality), Ecuador.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Not much is known about the the biology of Gnamptogenys mediatrix. We can speculate that the biology of this species is similar to other species of the genus. Gnamptogenys are predatory ponerine ants that inhabit tropical and subtropical mesic forests. Nesting is typically at ground level in rotten wood or leaf litter. Some exceptions include species that are arboreal, a dry forest species and species that nests in sandy savannahs. Colony size tends to be, at most, in the hundreds. Queens are the reproductives in most species. Worker reproduction is known from a few species in Southeastern Asia. Generalist predation is the primary foraging/dietary strategy. Specialization on specific groups (millipedes, beetles, other ants) has developed in a few species.



The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • mediatrix. Gnamptogenys mediatrix Brown, 1958g: 326, fig. 15 (w.q.) BRAZIL.