Gnamptogenys lacunosa

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

Gnamptogenys lacunosa casent0900591 p 1 high.jpg

Gnamptogenys lacunosa casent0900591 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of this species.

Identification

Lattke (2004) - Pronotum laterally with rugosities along posterior margin, mesosomal dorsum with low longitudinal strigae, evenly foveolate. Petiolar node with dorsal margin relatively evenly convex in lateral view; postpetiolar tergite mostly smooth with sparse punctae or punctulae in lateral view.

Most species of the laevior group have a mostly smooth longitudinal median band on the mesosoma and frons, in contrast to the regularly foveolate sculpturing of G. lacunosa. Some specimens of Gnamptogenys polytreta have a bluntly angular anterior clypeal lamella margin. Besides differences stated in the key, G. polytreta can be separated by the foveolae that cover over half of the postpetiolar tergite in lateral view and a very broadly convex dorsal petiolar node margin. The angle formed between the dorsal and declivitous propodeal margins in lateral view is not as obtuse in G. polytreta as it is in G. lacunosa, approaching nearly a right angle in G. polytreta. The coarsely strigose mandibular base of G. lacunosa may approximate that of Gnamptogenys rugodens, but the rugosities are deeper in G. rugodens, which has a wider (HW > 0.75 mm) and broader (CI > 0.80) head and relatively smaller eyes (OI < 0.25).

Distribution

Known only from Sabah.

Distribution based on Regional Taxon Lists

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

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 lacunosa. 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.

  • lacunosa. Gnamptogenys lacunosa Lattke, 2004: 198, figs. 47c, 48a, 55 (w.) BORNEO.

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

Description

Worker

Lattke 2004 Gnamptogenys fig 45-49

Worker. Metrics. [Holotype] Paratypes (n = 5): HL [0.91] 0.85-0.96, HW [0.70] 0.64-0.71, ML [0.41] 0.36-0.42, SL [0.60] 0.58-0.67, ED [0.22] 0.19-0.24, WL [1.23] 1.13-1.30 mm. CI [0.77] 0.74-0.76, SI [0.86] 0.86-0.95, MI [0.59] 0.55-0.64, OI [0.31] 0.32-0.34. Head with subparallel, broadly convex sides in lateral view, posterolateral corners bluntly angular; frons foveolate; clypeus longitudinally strigulose, strigulae extend onto lamella, with median area raised above rest of clypeus, not delimited by crest or abrupt slopes; anterior margin of lamella slightly scabrose, ending in median blunt point; mandibular dorsum strigulose-punctate, lateral margin straight, not sinuate; occipital lamella evenly convex in lateral view, posterior end more curved. Pronotum laterally with anterior and ventral margins separated by blunt angle, side foveolate with low longitudinal strigulae, strigulae more concentrated along posterior margin; anepisternum smooth with few punctae; katepisternum with low strigulae and foveolae, especially ventrally, anteroventral flange bordered by deep and broad sulcus, posterior ventral edge of katepisternum laterally raised, higher than metapleuron; mesopleural suture impressed as transverse line or series of contiguous depressions; propodeum with dorsal and declivitous margins forming blunt obtuse angle in lateral view, spiracle slightly elevated, sculpture strigulose-foveolate; mesosomal dorsum evenly foveolate, interspersed with low longitudinal strigae.

Lattke 2004 Gnamptogenys fig 54-55

Dorsum of petiolar node sparsely foveolate, mostly smooth, laterally foveolate-strigulose; subpetiolar process convex, projecting anterad; postpetiole laterally with broady convex dorsal margin, ventral margin broadly convex after process, not sinuate; postpetiole smooth with sparse punctae on anterior one-third or less of tergite, sparse and shallow punctulae posteriorly, some strigulae present around spiracle; postpetiolar dorsum mostly smooth with sparse punctae, abdominal tergite 4 sparsely punctulate. Fore coxae transversely strigulose. Dorsum of thorax and abdominal segments 1-4 with scattered erect to subdecumbent hairs. Body ferruginous brown; antennae, legs ferruginous.

Type Material

Holotype worker. Malaysia, Sabah, Crocker Range, 1600m, 18-v-1987, I. Löbl & D. Burckhardt. Deposited in Musee d'Histoire Naturelle Genève. Paratypes. Two workers in The Natural History Museum from the holotype nest. Two workers in BMNH, 1w in Instituto de Zoologia Agricola from Malaysia, Sabah, Kinabalu, 1560-1660m, 24-iv-1987, I. Löbl & D. Burckhardt, 30a.

Etymology

The species name is derived from the Latin term for “hole” or “opening,” lacuna (f.), and alludes to the depressions formed by the ant's foveolate cuticle.

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 198, figs. 47c, 48a, 55 worker described)