Gnamptogenys polytreta

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

Gnamptogenys polytreta casent0900592 p 1 high.jpg

Gnamptogenys polytreta casent0900592 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Gnamptogenys polytreta.

Identification

Lattke (2004) - This species could be confused with Gnamptogenys pertusa, Gnamptogenys lacunosa, and Gnamptogenys rugodens as discussed under G. pertusa. G. pertusa has a very prominent mandibular base, forming a bulging convexity in frontal view, and its subpetiolar process is subquadrate in lateral view, with a sharp posterior angle. G. rugodens has a more evenly convex dorsal margin of the petiolar node and a relatively shorter declivitous margin to the propodeum compared with the dorsal margin in lateral view; it is also larger bodied (HL > 0.85; HW > 0.65; WL > 1.25 mm) than G. polytreta. G. lacunosa has a more evenly convex dorsal petiolar node margin, the subpetiolar process forms a rounded lobe in lateral view, the lateral face of the postpetiolar tergite is mostly smooth with punctae on the anterior one-third or less, the dorsal and declivitous propodeal margins form a blunt obtuse angle, more open than in G. polytreta, and the mandibular base is more deeply strigulose in G. lacunosa.

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Malaysia (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Queen and male are unknown.

Nomenclature

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

  • polytreta. Gnamptogenys polytreta Lattke, 2004: 211, figs. 48b, 49a, 59 (w.) WEST MALAYSIA.

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

Lattke 2004 Gnamptogenys fig 45-49

Dorsum of head densely foveolate; oculomalar margin with low triangular projection; lateral mandibular margin slightly sinuate; clypeus convex with faint median convexity; occipital lamella protuberant and convex; anterior petiolar margin broadly concave in dorsal view, without protuberant lateral lobes; anterior and posterior shelves of node form minute acute angles in lateral view with node margins.

Description

Worker

Lattke 2004 Gnamptogenys fig 58-60

Metrics. [Holotype] Paratype: HL [0.77] 0.77, HW [0.59] 0.59, ML [0.37] 0.35, SL [0.51] 0.51, ED [0.19] 0.20, WL [1.13] 1.15 mm. CI [0.76] 0.76, SI [0.87] 0.88, MI [0.63] 0.59, OI [0.33] 0.34. Head with lateral margin separated from posterior margin in frontal view by brief, broadly concave to straight margin; oculomalar margin divided by low triangular projection into longer posterior broad convexity and shorter broadly convex to almost straight anterior margin; frons evenly foveolate; frontal lobe dorsally smooth with shallow elongate depressions, posteriorly bordered by abrupt slope; clypeus posterolaterally strigulose-foveolate, medially with longitudinal strigulae extending to posterior half of clypeal lamella, low rounded ridge extends anterad from frontal lobe; lamella mostly smooth, anterior margin of lamella convex with slight median convexity; mandible slightly sinuate laterally, rugulose-punctate basally, apically mostly smooth with punctae; head with broadly convex dorsal margin in lateral view, interrupted by brief abrupt elevation of frontal lobes posterior margin; frontal lobe and clypeus each form broad convexities; occipital lamella convex and protuberant.

Pronotum laterally foveolate with low longitudinal undulations; mesopleuron mostly smooth with foveolae on anepisternum and particularly along ventral katepisternum; metapleuron triangular, tapering anterodorsally and diverging posteroventrally, anterior margin broadly convex, mostly smooth, longitudinally strigulose ventrally; propodeum undulate with irregular depressions, declivitous and dorsal margins form blunt, slightly obtuse angle in lateral view; mesosoma laterally with broadly convex dorsum, medially almost flat. Petiolar node dorsum mostly smooth with punctae, laterally foveolate; subpetiolar process triangular, projecting anteriorly; postpetiole mostly smooth, laterally fovelate, with anterior foveolae deeper and wider than posterior foveolae, dorsum sparsely punctate; ventral margin of postpetiole mostly straight after process in lateral view, convex posteriorly; fourth abdominal segment mostly smooth, dorsum sparsely punctulae, punctae present along posterior margin. Fore coxae mostly transversely strigulose, smooth anteriorly. Dorsum of thorax and abdominal segments 1-4 with scattered erect to subdecumbent hairs. Body brown, antennae and legs ferruginous brown.

Type Material

Holotype worker. Malaysia, Pahang, Genting Highlands, Awana, 1150m, 3-iv-1993, I. Löbl & Calame #27b. Deposited in Musee d'Histoire Naturelle Genève. Paratype. One worker in The Natural History Museum from Malaysia, Pahang, Genting Highlands, Awana, 1150m, 3-iv-1993, I. Löbl & Calame #27c.

Etymology

The species name is derived from the Greek terms poly (many) plus tretos (perforated). It alludes to the multiple depressions of its foveolate sculpture.

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 211, figs. 48b, 49a, 59 worker described)