Tetramorium tortuosum

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Tetramorium tortuosum
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Tetramorium
Species group: tortuosum
Species: T. tortuosum
Binomial name
Tetramorium tortuosum
Roger, 1863

Tetramorium tortuosum casent0280879 p 1 high.jpg

Tetramorium tortuosum casent0280879 d 1 high.jpg

Specimen Labels

Synonyms

A Sri Lanka specimen was found under a stone.

Identification

Bolton (1977) - This species is close to Tetramorium yerburyi and Tetramorium pilosum; its distinction from those species is discussed under yerburyi.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Philippines.
Oriental Region: India, Sri Lanka (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Worker

Nomenclature

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

  • tortuosum. Tetramorium tortuosum Roger, 1863a: 181 (w.q.) SRI LANKA. Senior synonym of bellii, ethica: Bolton, 1977: 83.
  • bellii. Tetramorium (Xiphomyrmex) tortuosum var. bellii Forel, 1902c: 239 (w.) INDIA. Junior synonym of tortuosum: Bolton, 1977: 83.
  • ethica. Tetramorium (Xiphomyrmex) tortuosum var. ethica Forel, 1911i: 225 (w.) SRI LANKA. Junior synonym of tortuosum: Bolton, 1977: 83.

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

Description

Worker

Bolton (1977) - TL 3.8-4.4, HL 0.82-0.92, HW 0.78-0.86, CI 89-95, SL 0.70-0.80, SI 89-97, PW 0.60-0.70, AL 1.12-1.20 (15 measured).

Mandibles striate. Antennal sea pes moderately long, with SI approaching 100 but apparently always with HW> SL. Frontal carinae long, reaching back almost or quite to the occipital margin, the latter broadly and very shallowly concave. Antennal scrobes shallow and feeble impressions, shorter than the scape and not capable of containing it. Pronotal corners in dorsal view with rounded angles. Propodeal spines strong and acute, the metapleural teeth acute and generally triangular, but narrow in some specimens. Node of petiole in profile longer than high, the dorsal surface feebly convex and meeting the anterior face in a blunt but distinct angle. Post petiole rounded, convex above. In dorsal view the petiole node slightly longer than broad, the postpetiole subglobular and somewhat broader than long. Dorsum of head firmly and predominantly longitudinally rugulose but with a tendency to form narrow and feeble cross-meshes, especially posteriorly. The rugulae themselves are narrow, low and rounded. Dorsal alitrunk with similar but even more feeble rugulation, in places the rugulae tending to be effaced and replaced by shining areas. Sides of petiole usually retaining faint traces of sculpture but the dorsum generally smooth, only rarely with vestiges of sculpture. Postpetiole and gaster unsculptured. Hairs on dorsal head and alitrunk variable in length, usually shorter and stouter in Sri Lankan populations than in examples from India.

Type Material

Bolton (1977) - Syntype worker, female, Sri Lanka (H. Nietner) (location of types not known).

References