Gnamptogenys malaensis

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Gnamptogenys malaensis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. malaensis
Binomial name
Gnamptogenys malaensis
(Mann, 1919)

Gnamptogenys malaensis casent0219880 p 1 high.jpg

Gnamptogenys malaensis casent0219880 d 1 high.jpg

Specimen Labels

The type series from Malaita Island came from beneath the bark of a dead tree. Another collection, from [Makira], was noted as being collected in sifted litter from primary rainforest. This is the only species of the epinotalis group known from the Solomon Islands.

Identification

Lattke (2004) - The only other species of the epinotalis group with extensive longitudinal parallel sculpturing on the fourth abdominal tergite is Gnamptogenys cribrata. In that species the sculpturing consists of more regularly parallel costulae and rarely extends over half the dorsal surface of the tergite, and the postpetiole is mostly smooth with scattered punctae, not rugulose-punctate.

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Solomon Islands (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 malaensis. 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.

Worker

Nomenclature

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

  • malaensis. Rhopalopone malaensis Mann, 1919: 281 (w.) SOLOMON IS. Lattke, 2004: 176 (q.). Combination in Gnamptogenys: Brown, 1958g: 228.

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

Lattke (2004) - Cephalic posterior margin concave with shallow median notch in frontal view, anterior clypeal margin uniformly convex. Postpetiolar dorsum rugose-punctate (usually transversely oriented), slightly smoother medially; abdominal sternite 4 mostly smooth with round punctae.

Description

Worker

Lattke 2004 Gnamptogenys fig 43-44

Lattke (2004) - Metrics (n = 5): HL 0.68-0.71, HW 0.53-0.55, ML 0.26-0.32, SL 0.47-0.49, ED 0.06-0.07, WL 0.79-0.89 mm. CI 0.75-0.80, SI 0.89-0.91, MI 0.47-0.60, OI 0.11-0.13. Posterior cephalic margin with shallow median concave notch in frontal view, anterior clypeal margin uniformly convex; clypeus medially with longitudinally costulae that extend onto lamella, laterally rugulose-punctate, with broad smooth sulcus just posterad of mandibular insertion; vertex mostly smooth with shallow punctae laterally. Lateral pronotal face with low longitudinal strigulae; anepisternum mostly smooth with some punctae, frequently separated by impressed line or abrupt elevation from depressed, mostly smooth anterodorsal metapleural surface; katepisternum and posteroventral metapleuron longitudinally strigulose; mesosomal dorsum longitudinally rugulose-punctate, mostly impunctate medially; promesonotal suture appears as fine transverse line of variable length; sculpture on mesonotum sometimes smooth; propodeal declivity laterally smooth with median longitudinal carinulae, posterolateral ridge lacking or weakly developed, propodeal dorsal margin joins straight declivitous margin through blunt obtuse angle in lateral view. Postpetiolar dorsum rugose-punctate, slightly smoother medially; postpetiole rugulose-punctate to areolate in lateral view; fourth abdominal tergite dorsally longitudinally rugulose-punctate, medially impunctate, laterally longitudinally strigulose with scattered punctae; fourth abdominal sternite mostly smooth with round punctae. Dorsum of thorax and abdominal segments 1-4 with scattered erect to subdecumbent hairs. Head, mesosoma, petiole, and gaster brown; mandibles, antennae, legs ferruginous brown.

Queen

Lattke (2004) - Metrics (n = 1): HL 0.75, HW 0.60, ML 0.29, SL 0.51, ED 0.10, WL 0.89 mm. CI 0.80, SI 0.86, MI 0.49, OI 0.16. Ergatoid. Pronotal dorsum with arching rugulose-punctae; pronotum laterally with low diagonal to longitudinal strigulae and scattered punctae; anepisternum either smooth or strigulose; katepisternum longitudinally strigulose; metapleuron anterodorsally smooth with weak strigulae, posteroventrally longitudinally strigulose; mesoscutum longitudinally rugulose-punctate; scutellum with longitudinal or diagonal low undulations; lateral propodeal face densely areolate, propodeal dorsum transversely strigulose.

Type Material

Lattke (2004) - Syntype workers: Solomon Islands, Malaita Island, Auki (Mann) (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 228, Combination in Gnamptogenys)
  • 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 175, fig. 43 worker, queen described)
  • Mann, W. M. 1919. The ants of the British Solomon Islands. Bull. Mus. Comp. Zool. 63: 273-391 (page 281, worker described)