Gnamptogenys hyalina

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

The types were collected in degraded coastal hill forest on granite. One label states the specimens were from a small colony in dry bracket fungus on a log.

Identification

Lattke (2004) - Other species that could be confused with G. hyalina because of the smooth mandibles and clypeus are Gnamptogenys leiolabia and Gnamptogenys biloba. The three species share the same clypeal configuation (two elevated clypeal ridges that define a median depression with effaced sculpturing) and may constitute a small monophyletic group. The other two species have some rugosity on the clypeus in contrast to the strikingly smooth and polished surface of G. hyalina. G. leiolabia is smaller (HL < 0.70; WL < 1.00 mm) than G. hyalina and G. biloba has the lateral clypeal ridges more protuberant and the metacoxal tooth shaped as a peg and not triangular.

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Singapore (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 hyalina. 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 unknown.

Nomenclature

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

  • hyalina. Gnamptogenys hyalina Lattke, 2004: 196, fig. 54 (w.) SINGAPORE.

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

Head in lateral view with compound eye small and occipital lamella gradually curving from cuticular surface along its anterior edge and abruptly ending at the posterior angle. The clypeus with median glabrous area delimited on each side by longitudinal ridges, mandible mostly smooth with sparse punctulae.

Type Material

Description

Worker

Metrics. [Holotype] Paratype: HL [1.06] 1.03, HW [0.75] 0.71, ML [0.42] 0.42, SL [0.77] 0.74, ED [0.18] 0.18, WL [1.51] 1.47 mm. CI [0.70] 0.69, SI [1.03] 1.05, MI [0.56] 0.59, OI [0.25] 0.25. Head with subparallel sides in frontal view; foveolae on head with intermediate areas larger than their diameters, foveolae become denser laterally; anterior margin of clypeal lamella convex; anteromedially glabrous, laterally bound by two ridges that project anterad from frontal carina and form sides of lamella; head with occipital lamella gradually rising from cuticular surface anterad but abruptly angular posteriorly in lateral view. Pronotum laterally with round to oval, irregularly spaced foveolae; mesopleuron mostly smooth (sometimes slightly undulate) with few foveolae; metapleuron smooth and shining anterad with transverse strigulae posterad; mesosomal dorsum mostly smooth and shining with widely spaced punctae, usually separated by more than their diameters, propodeal declivity with arching smooth lateral strip in oblique frontal view and brief longitudinal depressions surrounding foramen.

Petiolar node mostly smooth with sparse foveolae; subpetiolar process triangular and anteriorly projecting; postpetiolar dorsum mostly smooth with sparse foveolae, their diameters less than those on petiolar node, anterolaterally with deep foveolae that fade out and decrease in diameter posterad; fourth abdominal sternite very broadly convex, almost straight, in lateral view; abdominal tergite 4 mostly smooth with sparse punctulae. Fore coxae smooth and shining in lateral view. Dorsum of thorax and abdominal segments 1-4 with scattered erect to subdecumbent hairs. Body brown; legs, antennae, and mandibles ferruginous brown.

Type Material

Holotype worker. Singapore, Bukit Timah Nature Reserve, 15-ii-1967, D.H. Murphy, Ab2-10. Australian National Insect Collection ants vial 32.16. Deposited in ANIC. Paratype. One paratype on the same pin as the holotype, also in ANIC.

Etymology

The species name is derived from the Greek adjective, hyalinos, meaning “of glass,” and alludes to the polished clypeal and mandibular 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 196, fig. 54 worker described)