Current View: All Antweb
Change View
Cite this page

Citing AntWeb


To cite this page, please use the following:

· For print:      Citation: AntWeb. Version 8.76.4. California Academy of Science, online at Accessed .

· For web:

Species: Tetramorium pleganon   Bolton, 1979 

Download Data

Current Valid Name:

Taxonomic History (provided by Barry Bolton, 2022)

Tetramorium pleganon Bolton, 1979 PDF: 146 (w.) MADAGASCAR. Malagasy. Primary type information: Primary type material: holotype worker. Primary type locality: Madagascar: 84 km. SW Sambava on road to Andapa, 70-160 m., 17.ii.1977, degraded forest, AB 43, strays on path (W.L. & D.E. Brown). Primary type depository: MCZC. Primary type specimen: CASENT0280587. AntCat AntWiki HOL

Taxonomic history

Status as species: Bolton, 1995b: 412; Hita Garcia & Fisher, 2012b PDF: 53 (redescription).
// Distribution


  Geographic regions (According to curated Geolocale/Taxon lists):
    Africa: Madagascar
  Biogeographic regions (According to curated Bioregion/Taxon lists):

Taxonomic Treatment (provided by Plazi)

Treatment Citation: Bolton, B., 1979, The ant tribe Tetramoriini (Hymenoptera: Formicidae). The genus Tetramorium Mayr in the Malagasy region and in the New World., Bulletin of the British Museum (Natural History) Entomology 38, pp. 129-181

Tetramorium pleganonHNS sp. n.

Holotype worker. TL 3.8, HL 0.92, HW 0.87, CI 97, SL 0.64, SI 74, PW 0.68, AL 1.10.

Mandibles with very faint, delicate longitudinal striation. Anterior clypeal margin with a very small median impression. Maximum diameter of eye 0.20. Frontal carinae strong, surmounted for most of their length by a narrow rim or flange, occipitally becoming indistinguishable from the surrounding sculpture. Antennal scrobes shallow but broad. Dorsal alitrunk transversely flattened, in dorsolateral view appearing only very weakly convex. Sides of alitrunk bluntly marginate. Propodeal spines elongate and strong, somewhat downcurved along their length. Metapleural lobes short-triangular, acute apically. Node of petiole in profile slightly higher than long, the anterolateral angle roughly a right-angle and the dorsum sloping posteriorly to the much more rounded posterodorsal angle. Postpetiole evenly convex. Dorsum of head regularly longitudinally rugulose, without occipital reticulation; about 11 rugulae between the frontal carinae at the level of the eyes, the spaces between them with very feeble ground-sculpture. Middle of dorsal alitrunk longitudinally rugose, with four roughly parallel strong rugae running from anterior pronotum to propodeum. Outside of these the rugae are more disorganized and meandering, with traces of a broken reticulum in places, especially on the pronotum. Petiole and postpetiole strongly rugose dorsally, the two about equally strongly sculptured. Basal third of first gastral tergite finely and densely reticulate-punctate. All dorsal surfaces of head and body with abundant fine hairs, dorsal surfaces of hind tibiae with suberect to subdecumbent short pilosity. Colour blackish brown, the appendages lighter.

Paratype workers. As holotype, but with dimensions TL 3.7 - 4.0, HL 0.92 - 0.96, HW 0.88 - 0.92, CI 96, SL 0.66 - 0.70, SI 75 - 76, PW 0.66 - 0.69, AL 1.10 - 1.12. Eye diameter 0.18 - 0.20 (2 measured).

Holotype worker, Madagascar: 84 km SW. Sambava on road to Andapa, 70 - 160 m, 17. ii. 1977 degraded for. AB 43, strays on path (W. L. & D. E. Brown) (MCZ, Cambridge).

Paratypes. Three workers with same data as holotype (MCZ, Cambridge; BMNH).

This is the only known Malagasy species with 11 - merous antennae which has the first gastral tergite sculptured.

Specimen Habitat Summary

Found most commonly in these habitats: 14 times found in Savannah grassland, 9 times found in rainforest, 11 times found in Uapaca woodland, 3 times found in montane rainforest, 3 times found in tropical dry forest, 3 times found in savannah woodland, 2 times found in degraded forest, 3 times found in Gallery forest on sandy soil, 2 times found in Gallery forest with bamboo, 1 times found in grassland, ...

Found most commonly in these microhabitats: 14 times sifted litter (leaf mold, rotten wood), 12 times ground forager(s), 5 times ex soil, 3 times under stone, 2 times pitfall trap, 2 times on ground, 1 times strays on path, 2 times sifted litter, 1 times ground nest, 1 times ex rotten log, 1 times under rotten log, ...

Collected most commonly using these methods: 6 times MW 20 sample transect, 10m, 3 times MW 50 sample transect, 5m, 4 times SD 20 digging sample transect, 10m, 3 times pitfall trap, PF 20 tube sample transect, 10m, 2 times MW 25 sample transect, 5m, 2 times MW 75 sample transect, 5,10m, 2 times PF 20 tube sample transect, 10m, 2 times 10 MaxiWinks, mixed samples, 1 times pitfall trap, PF 50 traps, 11 cm dbh with water, soap, formalin, nonlinear placement, 1 times Photos. male and female alates, 5 vials, 2 times pitfall trap, ...

Elevations: collected from 10 - 1736 meters, 911 meters average

Collect Date Range: collected between 1977-02-17 00:00:00.0 and 2012-05-12 00:00:00.0

Type specimens: Holotype of Tetramorium pleganon: casent0280587; paratype of Tetramorium pleganon: casent0280588

See something amiss? Send us an email.