Gnamptogenys posteropsis

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Gnamptogenys posteropsis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. posteropsis
Binomial name
Gnamptogenys posteropsis
(Gregg, 1951)

Gnamptogenys posteropsis casent0179959 p 1 high.jpg

Gnamptogenys posteropsis casent0179959 d 1 high.jpg

Specimen Labels

Labels from some of the specimens examined indicated that some came from leaf-mold berlesate and rainforest or were taken while foraging on vegetation.

Identification

Lattke (2004) - This striking species cannot be mistaken for any other Gnamptogenys. The posteriorly placed eyes, the keel on the gaster, and the deep transverse sulcus on the anterior margin of the fourth abdominal sternite suggest specialized predatory habits.

Distribution

Known from Borneo, Malaysia, Philippines and Sumatra.

Distribution based on Regional Taxon Lists

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

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 posteropsis. 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


Male is unknown.

Nomenclature

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

  • posteropsis. Stictoponera posteropsis Gregg, 1951: 77, figs. 1, 3 (q.) INDONESIA (Sumatra). Lattke, 2004: 146 (w.). Combination in Gnamptogenys: Brown, 1958g: 229.

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

Lattke (2004) - Eye subglobulose and situated one-half its diameter or less from the vertex in lateral view; postpetiolar sternum with V-shaped anterior process and longitudinal median keel extending from process to just beyond posterior sternal margin, forming angular lamellate projection.

Description

Worker

Lattke 2004 Gnamptogenys fig 34-35

Lattke (2004) - Metrics. (n = 3): HL 1.09-1.74, HW 0.92-1.35, ML 0.54-0.90, SL 0.89-1.51, ED 0.17-0.26, WL 1.53-2.49 mm. CI 0.78-0.88, SI 0.97-1.12, MI 0.59-0.67, OI 0.19-0.20. Head with straight lateral margins in frontal view, posterior margin concave with posterolateral projecting occipital lobes, anterior margin of clypeal lamella slightly sinuate with convex median projection; clypeus usually longitudinally strigulose with shallow median sulcus, occasionally transversely strigulose or mostly smooth with scattered punctae; frons mostly with round to oval foveolae; vertex posteriorly bordered by transverse carina that joins occipital lobes; eye situated one-half its diameter or less from vertex; scape longitudinally strigulose; mandibular dorsum mostly longitudinally strigose with scattered prominent costae, masticatory margin slightly denticulate; occipital lobe projects posteroventrad in lateral view.

Mesosomal dorsum with uniformly distributed round to oval foveolae, intervening cuticle smooth; humeral angle lamellate; promesonotal suture weakly impressed, discernible only medially; anepisternum relatively narrow; metanotal sulcus vaguely impressed; mesosoma with very broadly convex dorsal margin in lateral view, mostly foveolate, especially propodeum; propodeal declivity bordered by triangular lamella that surrounds declivity, declivity mostly smooth except for median raised area. Petiolar dorsum densely foveolate, ventral process subquadrate in lateral view; postpetiolar dorsum with round to slightly oval foveolae, not as dense as on mesonotum, posterior margin scrobiculate; sternum with V-shaped anterior process and longitudinal median keel extending from process to just beyond posterior sternal margin, keel occasionally medially effaced, posteriorly forming angular projection; dorsum of abdominal segment 4 longitudinally costate, laterally foveolate; presternite of fourth abdominal sternite with bluntly pointed posteromedian directed lobe that hangs over broad, deep transverse sulcus with smooth cuticle on 3/4 anterior part of sternite, posterior fourth longitudinally strigulose; presternal lobe hook shaped in lateral view. Fore coxa strigose laterally; fore tarsus opposite strigil with row of setae, basal seta stoutest. Dorsum of thorax and abdominal segments 1-4 with abundant erect hairs. Head, mesosoma, petiole, and gaster reddish to dark brown; mandibles, antennae, legs light brown to brown.

Queen

Lattke (2004) - Metrics (n = 1): HL 1.80, HW 1.42, ML 0.87, SL 1.52, ED 0.32, WL 2.73 mm. CI 0.79, SI 1.07, MI 0.61, OI 0.23. Pronotum densely foveolate laterally, medially either foveolate or mostly smooth; mesonotum longitudinally rugulose-punctate; anepisternum foveolate to longitudinally rugulose with scattered foveolae; propodeum densely foveolate.

Type Material

Lattke (2004) - Holotype queen: [Indonesia], Sumatra, Lampong, Wai Lima (Karny) (Museum of Comparative Zoology) [Examined].

References

  • Brown, W. L., Jr. 1958g. Contributions toward a reclassification of the Formicidae. II. Tribe Ectatommini (Hymenoptera). Bull. Mus. Comp. Zool. 118: 173-362 (page 229, Combination in Gnamptogenys)
  • Gregg, R. E. 1951. Two new species of exotic ants. Psyche (Camb.) 58: 77-84 PDF (page 77, figs. 1, 3 queen described)
  • 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 146, fig. 34 worker, queen described)