Gnamptogenys treta

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

Gnamptogenys treta casent0281847 p 1 high.jpg

Gnamptogenys treta casent0281847 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Gnamptogenys treta.

Identification

Lattke (2004) - This species is similar to Gnamptogenys paso and Gnamptogenys binghamii in the key. It may be further separated from G. paso by the larger size (HL > 1.6; WL > 2.3 mm) of G. paso. Also, the petiolar node of G. paso has a very broad dorsal margin, higher posterad than anterad, and the subpetiolar process has a posterior blunt angle. G. treta is slightly larger than G. binghamii, which has occipital lobes and a lamellate humeral angle.

Distribution

Only known from Sabah, Malaysia.

Distribution based on Regional Taxon Lists

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

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 treta. 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.

  • treta. Gnamptogenys treta Lattke, 2004: 153, fig. 37 (w.) BORNEO.

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

Scape mostly smooth with scattered piligerous punctae; occipital lobe absent; subpetiolar process projecting anterad as sharply pointed triangular lobe; sternum of fourth abdominal segment mostly smooth with sparse punctae; metacoxal tooth low and triangular.

Description

Worker

Lattke 2004 Gnamptogenys fig 36-37

Metrics. Holotype: HL 1.43, HW 1.18, ML 0.86, SL 1.34, ED 0.22, WL 2.08 mm. CI 0.83, SI 1.14, MI 0.73, OI 0.19. Head subquadrate in frontal view, widest anterad, lateral margins convex, posterior margin concave, anterior margin of clypeal lamella medially triangular with bluntly angular sides; frons and vertex densely foveolate; clypeus longitudinally strigulose with strigulae extending onto lamella; scape mostly smooth with scattered piligerous punctae; occipital lobes absent; occipital lamella well developed, convex. Pronotum foveolate, humeral angle small; anepisterum cuneiform, mostly smooth with scattered punctae; katepisternum foveolate with rugosity along posteroventral margin; metapleuron smooth anterodorsally, posteroventrally strigulose-punctate; propodeal declivity mostly smooth with transverse strigulae anterad; mesosomal dorsum foveolate, without transverse sutures, with median longitudinal smooth area. Mesosoma with convex dorsal pronotal margin in lateral view, mostly flat mesometanotum, convex dorsal propodeal margin and concave declivity. Petiolar node with subpetiolar process projecting anterad as sharply pointed triangular lobe in lateral view; postpetiolar dorsum foveolate, depressions becoming progressively smaller and less numerous posterad, sternum mostly smooth; dorsum of abdominal segment 4 mostly smooth with scattered punctulae, sternum mostly smooth with sparse punctae. Fore coxa transversely strigulose in lateral view; fore tarsus opposite strigil with row of stout setae; metacoxal tooth low, triangular. Dorsum of thorax and abdominal segments 1-4 with scattered erect to subdecumbent hairs. Head, mesosoma, petiole, and gaster ferruginous brown; mandibles, antennae, legs ferruginous.

Type Material

Holotype worker. Malaysia, Sabah, 7km N Tembunen, 700m, 20-v-1989, I. Löbl & D. Burckhardt 32a. Deposited in The Natural History Museum. Paratype. One worker in the BMNH with the same data as the holotype.

Etymology

The species name alludes to its foveolate cuticle and is derived from the Greek for “perforated,” tretos.

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 153, fig. 37 worker described)