Gnamptogenys epinotalis

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Gnamptogenys epinotalis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. epinotalis
Binomial name
Gnamptogenys epinotalis
(Emery, 1897)

Gnamptogenys epinotalis casent0903810 p 1 high.jpg

Gnamptogenys epinotalis casent0903810 d 1 high.jpg

Specimen Labels

E.O. Wilson collected this species from irregular soil galleries under a stone.

Identification

Lattke (2004) - Gnamptogenys epinotalis and Gnamptogenys luzonensis are both among the smallest Gnamptogenys, but G. epinotalis has a metanotal sulcus that is lacking in G. luzonensis. The propodeum of G. luzonensis may have partially effaced sculpture, but longitudinal strigulae and foveolae are usually present. Sutures around the katepisternum in G. luzonenis, and most other species of the epinotalis group, tend to be wider and deeper compared with other Old World Gnamptogenys clades and with a slight elevation of the katepisternum over the anepisternum and metapleuron. The petiolar node in G. epinotalis seems to be more bluntly convex in shape than in other species of the epinotalis group. The dense layer of short hairs on the body is rare for Old World Gnamptogenys, though Gnamptogenys sila almost approaches the condition in G. epinotalis.

Distribution

Only known from New Guinea

Distribution based on Regional Taxon Lists

Indo-Australian Region: New Guinea (type locality).

Check distribution from AntMaps.

Distribution based on specimens

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The above specimen data are provided by AntWeb. Please see Gnamptogenys epinotalis for further details

Biology

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


Males are unknown.

Nomenclature

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

  • epinotalis. Rhopalopone epinotalis Emery, 1897d: 550 (w.q.) NEW GUINEA. [Also described as new by Emery, 1900c: 311.] Combination in Gnamptogenys: Brown, 1958g: 228. See also: Lattke, 2004: 167.

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

Lattke (2004) - General color yellowish brown. Mesosoma with abundant short, erect standing hairs in lateral view; metanotal sulcus present; sutures surrounding katepisternum narrow and fine; katepisternum, lateral propodeal face, and most of metapleuron with fine, longitudinal, parallel carinulae; metapleuron mostly longitudinally striate to costulate; propodeal declivity mostly smooth with sparse punctae and posterolateral low rounded lobes. Petiolar node with bluntly convex dorsal margin in lateral view.

Description

Worker

Lattke (2004) - Metrics (n = 3): HL 0.50-0.58, HW 0.41-0.45, ML 0.24-0.25, SL 0.33-0.41, ED 0.04-0.04, WL 0.62-0.76 mm. CI 0.78-0.82, SI 0.80-0.91, MI 0.54-0.59, OI 0.09-0.09. Head with subparallel lateral margins in frontal view, anterior margin of clypeus generally convex, lamella bluntly angular laterally with slight median convex projection; clypeus longitudinally strigulose with median longitudinal smooth area. Pronotum densely punctate along dorsal half in lateral view, ventral half mostly smooth with sparse punctae and brief longitudinal strigulae present along posterior margin; pronotal dorsum with rugulae arching around anterior margin, medially longitudinal; anepisternum longitudinally strigulose anterad, posterad mostly smooth; katepisternum strigulose, not significantly elevated over surrounding cuticle, circumscribing sutures very fine; metapleuron mostly longitudinally striate to costulate; mesosoma with very broadly convex to almost flat dorsal margin in lateral view, metanotal sulcus well impressed and scrobiculate; mesosomal dorsum posterad of mesonotum medially mostly smooth, laterally and toward posterior propodeum strigulose-punctate; dorsal propodeal margin meeting declivitous margin through convexity, becoming relatively straight afterward at spiracular height; lateral propodeal face strigulose-punctate, propodeal declivity mostly smooth with sparse punctae and posterolateral low rounded lobes. Petiolar node with flat dorsal margin in lateral view; postpetiole laterally densely punctate, sternite strigulose-punctate, posteriorly thinning out somewhat; abdominal tergite 4 laterally punctulate, punctulae becoming less dense posterad, sternite smooth with some punctae. Dorsum of thorax, and abdominal segments 1-4 with dense mat of short, erect standing hairs, besides longer, scattered erect to subdecumbent hairs. Coloration yellowish brown.

Queen

Lattke (2004) - Metrics (n = 1): HL 0.60, HW 0.48, ML 0.26, SL 0.42, ED 0.13, WL 0.83 mm. CI 0.79, SI 0.88, MI 0.56, OI 0.28. Pronotum laterally punctate, mostly smooth posterad; mesometapleuron longitudinally strigulose; mesoscutum with longitudinal, parallel strigulae and rows of punctae especially laterally; scutellum mostly smooth medially, laterally strigulose, axillae strigulose-punctate; lateral propodeal face strigulose-punctate; propodeal declivity mostly smooth with some transverse strigulae medially.

Type Material

Lattke (2004) - Syntype workers, queen: New Guinea, Paumomu River (Loria) (MCSN) [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 228, Combination in Gnamptogenys)
  • Emery, C. 1897d. Viaggio di Lamberto Loria nella Papuasia orientale. XVIII. Formiche raccolte nella Nuova Guinea dal Dott. Lamberto Loria. [part]. Ann. Mus. Civ. Stor. Nat. 38[=(2(18): 546-576 (page 550, worker, 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 167, fig. 41 worker, queen described)