Tetramorium pilosum

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Tetramorium pilosum
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Tetramorium
Species group: tortuosum
Species: T. pilosum
Binomial name
Tetramorium pilosum
Emery, 1893

Tetramorium pilosum casent0280881 p 1 high.jpg

Tetramorium pilosum casent0280881 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Tetramorium pilosum.


Bolton (1977) - This distinctive orange-brown species is very closely related to Tetramorium yerburyi, also of Sri Lanka, but the shape of the petiole is radically different in the two species. The other large species from Sri Lanka, Tetramorium tortuosum, has the node of the postpetiole quite unsculptured and the hairs on the dorsal surfaces of the head and body are much shorter, stout, and blunt apically.


Reported from Zhejiang, China (Tang et al., 1985; Guenard & Dunn, 2012) but this is considered to be dubious by Agavekar et al. (2017) who treat this taxon as endemic to India (although it was described from Sri Lanka).

Distribution based on Regional Taxon Lists

Oriental Region: India, Sri Lanka (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb





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

  • pilosum. Tetramorium (Xiphomyrmex) pilosum Emery, 1893f: 247 (w.) SRI LANKA. See also: Bolton, 1977: 82.

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



Bolton (1977) - TL 4.1-4.5, HL 0.94-0.98, HW 0.90-0.94, CI 94-96, SL 0.76-0.82, SI 81-86, PW 0.66-0.72, AL 1.20-1.30 (6 measured).

Antennae 11-segmented, the scrobe reduced to a short, shallow groove which runs a little beyond the posterior margin of the eye, although the frontal carinae themselves extend almost to the occipital margin. Petiole strongly nodiform in profile (Fig. 6) with the dorsal surface convex; in dorsal view the node is globular and almost as broad as long. Metapleural lobes rounded, not dentiform. Mandibles longitudinally finely striate-rugulose, dorsum of head longitudinally rugose with a rugoreticulum on the sides and close to the occipital margin. Dorsal alitrunk with an open, raised rugoreticulum which is repeated on the dorsum of the petiole node where the rugae are more closely packed. Postpetiole with fainter but still distinct longitudinal rugulae. Gaster smooth and shining. Dorsal surfaces of head, alitrunk, pedicel and gaster with abundant very long, fine, acute hairs, the longest of which are c. 0.30 in length.

Type Material

Bolton (1977) - Holotype worker, Sri Lanka: Kandy, 1892 (E. Simon) (Museo Civico di Storia Naturale, Genoa) [examined].