Gnamptogenys crenaticeps

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

Gnamptogenys crenaticeps casent0219890 p 1 high.jpg

Gnamptogenys crenaticeps casent0219890 d 1 high.jpg

Specimen Labels

This species is only known from the type series. The ants were collected by Mann from beneath a stone.

Identification

Lattke (2004) - Scape surpasses posterior cephalic margin by at least twice apical width; third antennal segment longer than wide; frons longitudinally strigulose, densely rugulo-punctate laterally; promesonotal suture fine, partially impressed; metanotal sulcus fully developed but fine; metacoxal dorsum with low triangular tooth. Subpetiolar process roughly triangular in lateral view, projecting anterad, ventrally parallel sided, not cuneiform.

Also see the nomenclature section below.

Distribution

Endemic to Solomon Islands.

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 crenaticeps. 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.

  • crenaticeps. Wheeleripone crenaticeps Mann, 1919: 285, fig. 4 (w.) SOLOMON IS. Combination in Gnamptogenys: Brown, 1958g: 228. See also: Lattke, 2004: 62.

Description

Lattke (2004) - Gnamptogenys crenaticeps could be mistaken for a member of the epinotalis group on first examination because of the petiolar node shape, reduced eyes, indistinct anepisternum, well-defined katepisternum, and the close distance of the propodeal spiracle from the declivity. The antennal scapes in the epinotalis group do not surpass the posterior cephalic border, the subpetiolar process is subquadrate in shape, and there is more sculpturing on the body such as strigulae and punctate. Nevertheless, some of the shared characteristics hint at a close relation with the epinotalis species.

Worker

Lattke 2004 Gnamptogenys fig 13-15

Lattke (2004) - Metrics (n = 1): HL 0.88, HW 0.70, ML 0.44, SL 0.80, ED 0.12, WL 1.10 mm. CI 0.80, SI 1.14, MI 0.63, OI 0.17. Head elongate in frontal view, lateral margins broadly convex, posterior margin medially concave; anterior clypeal margin convex, lamella convex with median convex lobe; vertex mostly smooth, gradually curving onto frons; frontal lobe leaves dorsal lobe of torulus partially exposed; scape gradually widens apically, slightly arched basally, punctulate, surpassing posterior cephalic margin by at least twice apical width; first funicular segment longer than wide; frons longitudinally strigulose, densely rugulose-punctate laterally; clypeus longitudinally strigulose; mandibular dorsum shining and shallowly punctate, masticatory border denticulate. Eye hemispherical with reduced diameter (OI 0.17), but ommatidia large.

Pronotum anteroventrally pointed, ventral sulcus present; promesonotal suture fine, well impressed along half of pronotal width, absent along other half; metanotal sulcus slightly broader, well impressed; anepisternum indistinct; katepisternum with anterior sulcus. Dorsal mesosomal margin broadly convex in lateral view, metanotal sulcus slightly impressed; mesosoma mostly smooth, with sparse shallow punctae; brief longitudinal to oblique carinulae present around propodeal spiracle and metapleural ventral margin; metapleural propodeal sulcus impressed, forming broken series of fine lines; propodeal declivity flat, higher than wide, glabrous, without denticles or ridges, propodeal spiracle on rounded elevation, projecting slightly beyond declivity in lateral view, declivitous propodeal margin relatively straight, forming obtuse angle with dorsal margin in lateral view. Petiole in lateral view erect, dorsal margin convex, shorter than broadly convex anterior margin; subpetiolar process roughly triangular, projecting anterad; petiolar spiracle situated below anterolateral process, anterior ridge forms low transverse crest; postpetiolar process forming V-shaped overturned lip in anterior view, slightly swollen laterally; gaster mostly smooth. Basal fore tarsal segment with single stout seta opposite strigil, dorsum smooth with some punctae; second segment with four stout apical setae; segments 2-4 as long as wide; metacoxal dorsum with low triangular tooth. Dorsum of thorax and abdominal segments 1-4 with scattered erect to subdecumbent hairs. Head, mesosoma, petiole, and gaster dark brown; mandibles, scape, legs ferruginous brown.

Type Material

Lattke (2004) - Syntype workers: Solomon Islands, Isabel Island, Fulakora (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 62, fig. 13 worker described)
  • Mann, W. M. 1919. The ants of the British Solomon Islands. Bull. Mus. Comp. Zool. 63: 273-391 (page 285, fig. 4 worker described)