Gnamptogenys paso

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Gnamptogenys paso
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. paso
Binomial name
Gnamptogenys paso
Lattke, 2004

Gnamptogenys paso casent0900565 p 1 high.jpg

Gnamptogenys paso casent0900565 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of this species.

Identification

Lattke (2004) - This species comes close to Gnamptogenys binghamii in the key. G. binghamii can be separated from G. paso by its smaller size (HL < 1.5; WL < 2.0 mm) and evenly convex petiolar node when seen laterally, as well as the lamellate humeral angle. The head of the holotype is detached and separately mounted on the same pin as the body.

Distribution

Known only from Malaysia

Distribution based on Regional Taxon Lists

Indo-Australian Region: Malaysia (type locality).

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 paso. 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

Queen and male are unknown.

Nomenclature

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

  • paso. Gnamptogenys paso Lattke, 2004: 143, fig. 33 (w.) WEST MALAYSIA.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Head with sinuate lateral margins in frontal view, slightly concave near eyes, convex anterad. Anterior margin of clypeal lamella converging toward median blunt point, laterally bluntly angular. Mesosomal dorsum mostly smooth with scattered foveolae laterally, plus scattered shallow patches of longitudinal undulations. Petiolar node with dorsal margin higher posterad than anterad in lateral view; anterior margin straight and vertical, dorsal margin broadly convex, posterior margin steeply descending.

Description

Worker

Lattke 2004 Gnamptogenys fig 31-33

Metrics. [Holotype] Paratypes (n = 3): HL [1.75] 1.71-1.76, HW [1.52] 1.43-1.51, ML [0.92] 0.91-1.00, SL [1.59] 1.61-1.62, ED [0.33] 0.29-0.31, WL [2.48] 2.44-2.50 mm. CI [0.61] 0.83-0.88, SI [1.05] 1.07-1.13, MI [0.61] 0.64-0.66, OI [0.22] 0.20-0.21. Head with lateral margins sinuate in frontal view, slightly concave near eyes, convex anterad; posterior margin concave, anterior margin of clypeal lamella converging toward median blunt point, laterally bluntly angular; frons strigulose-punctate, strigulae continuing onto cephalic sides; clypeus longitudinally strigulose; scape with variable smooth and strigulose areas, most strigulae present apically; occipital lobe present; occipital lamella convex, parallel sided. Mesosoma mostly foveolate in lateral view, pronotal background sculpture mostly smooth dorsally, strigulose ventrally and on mesopleuron; pronotum with anterodorsal margin strigulose-punctate, anteroventrally bluntly angular, humeral angle not lamellate; mesosomal dorsum mostly smooth with scattered foveolae laterally, plus scattered, shallow longitudinal undulations; anterodorsal metapleuron mostly smooth, posteroventral metapleuron longitudinally strigulose; propodeal dorsum with more foveolae and strigulae, propodeal declivity mostly smooth, with triangular denticles.

Petiolar dorsum mostly smooth with scattered foveolae, node with dorsal margin higher posteriorly than anteriorly in lateral view, anterior margin straight and vertical, dorsal margin broadly convex, posterior margin steeply descending; ventral petiolar process forms anteriorly projecting triangular lobe; postpetiolar dorsum mostly smooth with scattered shallow punctae, anterolaterally with oblique strigulae; sternum mostly smooth with lateral and posterolateral strigulae; fourth abdominal tergite mostly smooth with scattered punctulae, sternum smooth. Fore coxa transversely strigulose in lateral view, especially along posterior half; fore tarsus opposite strigil with row of stout setae; metacoxal tooth straight with posterior flange. Dorsum of thorax and abdominal segments 1-4 with few, scattered erect to subdecumbent hairs. Head, mesosoma, petiole, and gaster ferruginous-brown; mandibles, antennae, legs ferruginous.

Type Material

Holotype worker. Malaysia, Negeri Sembilan, Pasoh Forest Reserve, iii-1994, M. Brendell, K. Jackson, L. Ficken. Deposited in The Natural History Museum.

Etymology

The species name is derived from the name of the type locality, Pasoh Forest Reserve, and is assumed to be feminine.

References

  • Lattke, J. E. 2004. A Taxonomic Revision and Phylogenetic Analysis of the Ant Genus Gnamptogenys Roger in Southeast Asia and Australasia (Hymenoptera: Formicidae: Ponerinae). University of California Publications in Entomology 122: 1-266 (page 143, fig. 33 worker described)