Gnamptogenys concinna

Consistently collected and observed on trees, this species is an arboreal nester. Longino found a nest inside a large, deep knothole and records prey items of the following: Heteroptera: Pentatomidae, Aradidae; Coleoptera: Cerambycidae, Histeridae, Platypodidae, Chrysomelidae, Tenebrionidae, and Passalidae. One observed foraging group was made up of 9 workers and a dealate queen. Observations of group foraging of up to 40 single-file workers, plus the following Longino observation, indicate trail and/or recruiting pheromone communication in this species. “The foragers walked with their gasters curled and touching the substrate. When they were together near the prey I could often make out a tiny white area (gland?) exposed at the very tip of the gaster, which other workers would investigate”. (Lattke 1995)

Identification
A member of the concinna species group. A large finely striate species with transverse striae on propodeum, declivity medianly smooth; Promesonotal suture weakly impressed or absent; mesometanotal suture deep and wide; metacoxal tooth absent, low crest or tubercle at most. Color can vary from ferruginous to light-brown, and the striae on the posterior nodal face may be effaced. (Lattke 1995)

Distribution based on Regional Taxon Lists
Neotropical Region: Bolivia, Brazil, Colombia, Costa Rica, Ecuador, Mexico, Panama, Peru, Trinidad and Tobago, Venezuela.

Nomenclature

 *  concinna. Ectatomma concinna Smith, F. 1858b: 103 (q.) BRAZIL. Mayr, 1866b: 892 (w.). Combination in Gnamptogenys: Mayr, 1866b: 892; in Ectatomma (Gnamptogenys): Mayr, 1887: 541; in E. (Tammoteca): Santschi, 1929h: 476; in Gnamptogenys: Brown, 1958g: 227. Senior synonym of conica, romani, semicircularis: Brown, 1958g: 227. See also: Lattke, 1995: 162.
 * romani. Ectatomma (Gnamptogenys) concinnum var. romani Wheeler, W.M. 1923: 2 (w.) BRAZIL. Junior synonym of concinna: Brown, 1958g: 227.
 * conica. Gnamptogenys concinna var. conica Borgmeier, 1929: 196 (w.) BRAZIL. Junior synonym of concinna: Brown, 1958g: 227.
 * semicircularis. Gnamptogenys concinna var. semicircularis Borgmeier, 1929: 195 (w.) BRAZIL. Junior synonym of concinna: Brown, 1958g: 227.

Ectatomma concinna

Holotype queen in. Labelled “Braz. Santarem” on one side, and “52/96,” on the other. Acc. Reg.: “1852 no. 96 (Sept. 6) Purchased of Stevens. Collected by Mr Bates.”