Gnamptogenys palamala

AntWiki - Where Ant Biologists Share Their Knowledge
Jump to: navigation, search
Gnamptogenys palamala
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. palamala
Binomial name
Gnamptogenys palamala
Lattke, 2004

Gnamptogenys palamala casent0900564 p 1 high.jpg

Gnamptogenys palamala casent0900564 d 1 high.jpg

Specimen Labels

This species is only known from types. These specimens were collected from a mixed dipterocarp forest.

Identification

Lattke (2004) - The shape of the mandibles, the smooth mandibular dorsum, and the dorsal bulge of the fourth abdominal tergite make this species easy to determine.

Distribution

Distribution based on Regional Taxon Lists

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

Distribution based on AntMaps

AntMapLegend.png

Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Not much is known about the the biology of Gnamptogenys palamala. 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 are unknown.

Nomenclature

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

  • palamala. Gnamptogenys palamala Lattke, 2004: 141, fig. 32 (w.) BORNEO.

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

Mandibular dorsum mostly smooth with scattered punctulae, masticatory margin separated from internal margin by sharp angle, the masticatory and internal margins diverging from each other. Tergite of abdominal segment 4 with basal half longitudinally strigose and bulging in lateral view, apical half transversely strigose and straight in lateral view.

Description

Worker

Lattke 2004 Gnamptogenys fig 31-33

Metrics. [Holotype] Paratype (n = 1): HL [1.51] 1.78, HW [1.29] 1.32, ML [0.77] 0.80, SL [1.35] 1.45, ED [0.25] 0.28, WL [2.06] 2.24 mm. CI [0.85] 0.74, SI [1.05] 1.10, MI [0.51] 0.61, OI [0.19] 0.21. Head with subparallel lateral margins in frontal view, posterior margin medially straight with lateral lobes slightly projecting posterad; anterior margin of clypeus forms obtuse angle with median blunt point, lamella not well developed; cephalic vertex with carina that borders posterior margin, joining both occipital lobes; frons densely foveolate, almost areolate, with fine longitudinal sulcus extending posterad of frontal triangle and ending at eye height; clypeus posteromedially foveolate, anteriorly longitudinally striate; mandibular dorsum mostly smooth with scattered punctulae, masticatory margin with low denticles and separated from internal margin by sharp angle, the two margins diverging from each other; scape longitudinally strigulose and punctate; occipital lamella angular at both ends.

Anteroventral margins of pronotum form sharp point in lateral view; anteroventral margin of anepisterum with smooth and prominent carinae; katepisternum wedge shaped; mesosoma densely foveolate; promesonotal suture brief; mesosoma with evenly convex dorsal margin curving posterad to peg like propodeal denticle in lateral view, then briefly concave before becoming convex again. Petiolar node evenly convex, areolate in lateral view; ventral process forming narrow, anteriorly placed lobe; postpetiolar dorsum with dense round foveolae anteriorly, posteriorly becoming less dense and oval; sternum medially smooth; tergite of abdominal segment 4 with basal half longitudinally strigose and bulging in lateral view, apical half transversely strigose and straight in lateral view. Fore coxae with low to prominent transverse strigulae in lateral view; fore tarsus opposite of strigil with row of stout setae. Head, mesosoma, petiole, and gaster reddish to dark brown; mandibles, antennae, legs brown.

Type Material

Holotype worker. Malaysia, Sarawak, Fourth Division, Gunung Mulu Natl. Pk., P.E. Hammond & J.E. Marshall, v-viii-1978, BM 1978-49. Deposited in The Natural History Museum. Paratype. One worker on the same pin as holotype, deposited in BMNH.

Etymology

The species name is a compound epithet derived from the feminine Latin nouns for “shovel,” pala, and “jawbone,” mala. It alludes to the shovel-like mandibles of this species.

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 141, fig. 32 worker described)