Gnamptogenys fistulosa

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

Gnamptogenys-fistulosaL4x.jpg

Gnamptogenys-fistulosaD4x.jpg

Specimen Label

This species is only known from type specimens.

Identification

This species can be confused with Gnamptogenys chapmani because of the similar size, subquadrate subpetiolar process, convex anterior margin of the clypeal lamella, and a blunt angle formed by the anterior and ventral pronotal margins in lateral view. The propodeal spiracle in chapmani is not elevated, as in fistulosa, and this can also be used to separate these two species.

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Philippines (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 fistulosa. 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

Queens are males are unknown.

Nomenclature

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

  • fistulosa. Gnamptogenys fistulosa Lattke, 2004: 193, fig. 53 (w.) PHILIPPINES (Luzon).

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

Description

Clypeus posteriorly with lateral irregular depressions, posteriorly mostly smooth with thin, longitudinal extension of relatively smooth cuticle; mesometapleuron and lateral propodeal surfaces mostly smooth, propodeal spiracle on rounded prominence above surrounding cuticle; petiolar dorsal margin evenly convex in lateral view.

Worker

Lattke 2004 Gnamptogenys fig 52-53

Metrics: [Holotype] Paratypes (n = 2): HL [0.75] 0.81, 0.81; HW [0.59] 0.61, 0.60; ML [0.40] 0.35, 0.35; SL [0.51] 0.51, 0.51; ED [0.18] 0.20, 0.18; WL [1.09] 1.08, 1.05 mm. CI [0.79] 0.75, 0.74; SI [0.86] 0.83, 0.86; MI [0.67] 0.58, 0.59; OI [0.31] 0.33, 0.31. Head with broadly convex, semiparallel sides in frontal view, anterior clypeal margin convex; clypeus posteromedially mostly smooth, laterally enclosed by irregular depressions, smooth area tapering posteriorly, sometimes extending to frons, lamella with brief longitudinal strigulae; frons with foveolae arranged in irregular longitudinal rows; fine, longitudinal impressed line extends from posterior clypeal margin to just beyond frontal lobes; frontal lobe smooth and flat; mandible sharply convex basally, dorsally with elongate punctae; occipital lamella evenly convex in lateral view.

Pronotum with anterior and ventral margins meeting through blunt, obtuse angle in lateral view, ventral margin slightly sinuate, with sparse foveolae present on upper two-thirds, bottom third mostly smooth, brief longitudinal strigulae present on posterior margin; promesonotal suture vestigial; mesopleuron mostly smooth, anteroventral sulcus of katepisternum broad and deep, posteroventrally with several tightly grouped foveolae; mesopleural suture with transverse ridges; metapleuron and lateral propodeum mostly smooth, with few depressions or strigulae present; propodeal spiracular opening elevated on rounded prominence, dorsal propodeal margin meets declivity through blunt angle in lateral view, declivitous margin broadly convex.

Mesosomal and petiolar dorsum mostly smooth, sparsely foveolate, most foveolae situated laterally and along anterior pronotal margin; petiolar node with evenly convex dorsal margin in lateral view, ventral process subquadrate; postpetiolar sternite mostly broadly convex to almost straight in lateral view, convex ventrad of anterior process, abruptly convex at posterior margin; postpetiolar dorsum mostly smooth with sparse foveolae, most foveolae anterolaterally situated. Abdominal tergite 4 with sparse punctae anterolaterally, dorsum mostly smooth with few punctulae. Fore coxa laterally mostly smooth. Dorsum of thorax and abdominal segments 1-4 with scattered erect to subdecumbent hairs. Body light brown, extremities ferruginous.

Type Material

Holotype worker. Philippines, Luzon, Lagunas, Mt. Makiling, 250m, 28-x-1966, L.D. Uhler. Deposited in Museum of Comparative Zoology. Paratypes. Two workers from the same nest series as the holotype, deposited in Museum of Comparative Zoology.

Etymology

The species name is derived from the Latin adjective, fistulosus, “full of holes,” and alludes to the foveolate sculpturing.

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 193, fig. 53 worker described)