Gnamptogenys scalpta

AntWiki - Where Ant Biologists Share Their Knowledge
Jump to navigation Jump to search
Gnamptogenys scalpta
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. scalpta
Binomial name
Gnamptogenys scalpta
Lattke, 2004

Gnamptogenys scalpta casent0281845 p 1 high.jpg

Gnamptogenys scalpta casent0281845 d 1 high.jpg

Specimen Labels

One of the few specimens of this species was found in a log on a sunny ridge of a montane rainforest.

Identification

Lattke (2004) - This species and Gnamptogenys helisa have fine striations on the body, but G. helisa is a larger species (HL > 1.0; WL > 2.2 mm), with mostly smooth scapes, and the anterior margin of its clypeal lamella converges to a median lobe, while the lamellar margin in G. scalpta is sinuate, not converging so directly. The petiolar node in G. helisa is not evenly convex when seen laterally but higher posterad than anterad, its subpetiolar process is shaped as an anteriorly projecting narrow lobe, and it has small but distinct propodeal denticles.

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo (type locality), Indonesia, Malaysia.

Distribution based on AntMaps

AntMapLegend.png

Distribution based on AntWeb specimens

Check data from AntWeb

Biology

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

  • scalpta. Gnamptogenys scalpta Lattke, 2004: 149, fig. 35 (w.) BORNEO.

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

Propodeal declivity mostly smooth with strigulae along lateral margins and two diverging, posteromedian crests, declivity with broad lamella surrounding its posterolateral margins, propodeal denticles absent. Petiolar node convex with anterior margin longer than posterior margin in lateral view; ventral process subquadrate, slightly more projecting anterad than posterad, with dorsum foveolate over transverse striae; postpetiolar dorsum with punctae over transversely striate ground sculpture anteriorly, becoming longitudinal posteriorly.

Description

Worker

Lattke 2004 Gnamptogenys fig 34-35

Metrics. Holotype: HL 1.35, HW 1.20, ML 0.74, SL 1.23, ED 0.20, WL 1.94 mm. CI 0.89, SI 1.03, MI 0.62, OI 0.17. Head with broadly convex lateral margins in frontal view, posterior margin concave, anterior margin of clypeal lamella sinuate, with median blunt point; frons longitudinally strigulose with abundant round to oval punctae; clypeus longitudinally strigulose with median shallow sulcus; scape longitudinally carinate; occipital lamella narrow, bluntly angular at both ends. Mesosoma mostly foveolate-striate in lateral view; mesosomal dorsum with round to oval foveolae on smooth to striate cuticle; pronotum with posteromedian striate area devoid of foveolae; promesonotal suture impressed as transverse line; mesonotum lacking foveolae medially, mostly smooth with weak curves to transverse striae; mesopleural suture scrobiculate; anterodorsal metapleuron smooth; propodeal dorsum densely foveolate, laterally with scalloped foveolae, propodeal declivity mostly smooth with strigulae along lateral margins and two diverging posteromedian crests, with broad lamella surrounding posterolateral propodeal margin, denticles absent.

Petiolar node dorsum transversely foveolate-striate, with anterior margin longer than posterior margin in lateral view, ventral petiolar process subquadrate, projecting slightly more anterad than posterad; postpetiolar dorsum with punctae in shallow elongate depressions that become deeper posterad, ground sculpture transversely striate along anterior half, becoming longitudinal on posterior half; posterior margin with narrow strigulose band; dorsum of abdominal segment 4 mostly smooth with scattered punctae, each puncture coinciding with small striate patch, mostly obliquely strigulate in lateral view, sternum strigulose. Fore coxa transversely striate in lateral view; fore tarsus opposite strigil with row of stout setae; metacoxal tooth relatively long and straight. Dorsum of thorax and abdominal segments 1-4 with scattered erect to subdecumbent hairs. Head, mesosoma, petiole, and gaster dark brown; mandibles, antennae, legs brown.

Type Material

Holotype worker. Malaysia, Sabah, Poring Hot Springs, 600m, 10-v-1987, I. Löbl & D. Burckhardt 19a. Deposited in The Natural History Museum.

Etymology

The species name is derived from the Latin, scalptus, meaning “scratch” or “engrave,” and alludes to the fine striations on the body of this species.

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 149, fig. 35 worker described)