Tetramorium dichroum

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Tetramorium dichroum
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Tetramorium
Species group: solidum
Species: T. dichroum
Binomial name
Tetramorium dichroum
Santschi, 1932

Tetramorium dichroum casent0280905 p 1 high.jpg

Tetramorium dichroum casent0280905 d 1 high.jpg

Specimen Labels

Tetramorium dichroum has been recorded from grassland with trees, and also in Karoo vegetation. This species nests in the soil and feeds on seeds.

Identification

Mbanyana et al (2018) - In the Tetramorium solidum group, there are five species with abundant hairs covering the dorsal surfaces of the whole body, namely, Tetramorium rothschildi, Tetramorium peringueyi, Tetramorium dichroum, Tetramorium margueriteae and Tetramorium brigitteae. Tetramorium rothschildi is easily separated from other species by having branched hairs. Tetramorium dichroum can be easily distinguished from T. peringueyi and T. margueriteae by the absence of erect hairs on the antennal scapes. Tetramorium dichroum and T. brigitteae can be distinguished on the basis of the spine length: in T. dichroum spines are long and acute (PSLI 10–16), whereas T. brigitteae has very short propodeal teeth (PSLI 6).

Keys including this Species

Distribution

South Africa (Eastern Cape Province, southern parts of the Free State, Northern Cape and Western Cape Provinces) and Zambia.

Distribution based on Regional Taxon Lists

Afrotropical Region: South Africa (type locality), Zambia.


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Habitat

Known from Drakensberg Montane Grasslands, Kalahari Xeric Savanna, Montane Fynbos and Renosterveld, Nama Karoo, Succulent Karoo, Zambezian and Mopane Woodlands.

Biology

Castes

Nomenclature

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

  • dichroum. Tetramorium solidum st. dichroum Santschi, 1932a: 388 (w.) SOUTH AFRICA. Subspecies of peringueyi: Prins, 1973: 11. Raised to species: Bolton, 1980: 245.

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

Description

Worker

Mbanyana et al (2018) - (N = 11) HL 0.934–1.023 (0.987); HW 0.944–1.072 (1.003); SL 0.659–0.747 (0.703); EL 0.216–0.246 (0.237); PH 0.393–0.521 (0.451); PW 0.590–0.669 (0.638); WL 0.924–1.121 (1.015); PSL 0.098–0.157 (0.136); PTH 0.315–0.364 (0.341); PTL 0.275–0.354 (0.325); PTW 0.315–0.374 (0.343); PPH 0.315–0.491 (0.438); PPL 0.246–0.285 (0.267); PPW 0.382–0.457 (0.415); OI 23–25 (24); CI 100–105 (102); SI 66–73 (70); DMI 59–70 (63); LMI 39–52 (45); PSLI 10–16 (14); PeNI 50–57 (54); LPeI 85–100 (95); DPeI 99–114 (106); PpNI 61–70 (65); LPpI 50–80 (62); DPpI 144–186 (156); PPI 115–128 (121).

Type Material

Mbanyana et al (2018) - Syntypes South Africa: 3 pinned workers, Northern Cape, Kimberley, 1924, Power leg. (Naturhistorisches Museum, Basel: CASENT0915004; South African Museum: SAM-ENT-0011758).

References