Gnamptogenys rastrata

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Gnamptogenys rastrata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. rastrata
Binomial name
Gnamptogenys rastrata
(Mayr, 1866)

Gnamptogenys rastrata casent0173385 profile 1.jpg

Gnamptogenys rastrata casent0173385 dorsal 1.jpg

Specimen labels

Synonyms

Captured in wet forests, including montane areas. A millipede feeder.

Identification

A member of the rastrata complex (in the rastrata subgroup of the rastrata species group). Antennal scapes surpass vertexal margin by no more than their apical width; triangular and edentate mandibles with a varying degree of costulate and rugae; small tubercle-like propodeal teeth next to conspicuous spiracles which are slightly elevated above rest of surrounding cuticle; postpetiolar sternum with median longitudinal smooth and shining areas. The sculpture on the node as seen dorsally can vary from concentric costulae, with transverse or longitudinal costulae in the middle, or completely transverse. The petiolar node can be wider than long or the opposite. Size range is HL 0.74-0.90; WL 1.10-1.28 mm. (Lattke 1995)

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Brazil (type locality), Paraguay.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Not much is known about the the biology of Gnamptogenys rastrata. 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.

Castes

Nomenclature

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

  • rastrata. Ectatomma rastratum Mayr, 1866b: 890 (q.) BRAZIL. Combination in E. (Gnamptogenys): Emery, 1890b: 41; in E. (Parectatomma): Emery, 1911d: 44; in Gnamptogenys: Brown, 1958g: 229. Senior synonym of trigona: Lattke, 1995: 180.
  • trigona. Ectatomma (Gnamptogenys) trigonum Emery, 1906c: 114 (footnote) (q.) BRAZIL. Combination in E. (Parectatomma): Emery, 1911d: 44; in Gnamptogenys: Brown, 1958g: 230. Junior synonym of rastrata: Lattke, 1995: 180.

Description

References