Tetramorium sepultum

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Tetramorium sepultum
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Tetramorium
Species: T. sepultum
Binomial name
Tetramorium sepultum
Bolton, 1980

Tetramorium sepultum P casent0901160.jpg

Tetramorium sepultum D casent0901160.jpg

Specimen Label

Tetramorium sepultum seems is a rare Southern African species known from but a few collections.

Identification

Tetramorium sepultum can be best distinguished from the rest of the species complex by the following characters: propodeal spines medium sized and thick (PSLI 22 - 23); relatively small eyes (OI 21 -22); dorsum of mesosoma longitudinally rugose without distinct ground sculpturation; first gastral tergite without standing hairs.

A member of the Afrotropical weitzeckeri species complex, which is part of the weitzeckeri species group.

Keys including this Species

Distribution

Known from South Africa, Mozambique and Swaziland.

Distribution based on Regional Taxon Lists

Afrotropical Region: Mozambique, Swaziland (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Nomenclature

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

  • sepultum. Tetramorium sepultum Bolton, 1980: 232 (w.) SWAZILAND. See also: Hita Garcia, Fischer & Peters, 2010b: 78.

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

Hita Garcia et al. (2010) - In terms of morphological similarities Tetramorium sepultum can be set together with Tetramorium bendai, Tetramorium humbloti, and Tetramorium tanaense. All four share the absence of standing hairs on the first gastral tergite that separates them from Tetramorium boltoni, Tetramorium guineense, Tetramorium renae, Tetramorium snellingi, and Tetramorium weitzeckeri. However, T. bendai with its conspicuous and dense reticulate-punctate ground sculpturation on the mesosoma differs strongly from T. sepultum which shows no distinct ground sculpturation there. The latter also possesses a less transverse postpetiole (DPpI 194 - 200) than T. bendai (DPpI 206 - 239). Additionally, T. humbloti can be well separated from T. sepultum since the mesosomal, especially the pronotal, dorsum in the first is generally smooth and shiny whereas it is longitudinally rugose in the latter. The mesosomal dorsum of T. tanaense is longitudinally rugulose, but the eyes of this species are larger (OI 26 - 29) and the propodeal spines longer (PSLI 34 - 37) than in T. sepultum (OI 21 - 22, PSLI 22 - 23). In addition, the latter possesses much more standing hairs on the dorsum of mesosoma (usually 14 or more) than T. tanaense (8 at most).

Description

Worker

Hita Garcia et al. (2010) - HL 0.789 - 0.811; HW 0.767 - 0.789; SL 0.622 - 0.644; EL 0.167 - 0.172; PW 0.578 - 0.589; WL 0.933 - 0.989; PSL 0.178; PTL 0.122 - 0.128; PTH 0.356 - 0.361; PTW 0.317 - 0.344; PPL 0.200 - 0.206; PPH 0.378 - 0.383; PPW 0.389 - 0.411; CI 97; SI 81 - 82; OI 21 -22; PSLI 22 - 23; PeNI 55 - 58; LPeI 34 -36; DPeI 259 - 270; PpNI 67 - 70; LPpI 52- 54; DPpI 194 - 200; PPI 119 - 122 (2 measured).

Head slightly longer than wide (CI 97). Anterior clypeal margin with weak but distinct median impression. Frontal carinae strongly developed, ending distinctly before posterior margin of head. Antennal scrobe narrow, shallow, without differentiated ventral margin, not reaching posterior margin of head. Antennal scape of medium length, not reaching posterior margin of head (SI 81 - 82). Eyes relatively small (OI 21 - 22), with 8 to 9 ommatidia in longest row. Metanotal groove weakly impressed. Propodeal spines of medium size and relatively thick (PSLI 22 - 23). Propodeal lobes small, triangular and acute. Node of petiole squamiform, in dorsal view transverse, more than 2.5 times wider than long (DPeI 259 - 270), in lateral view around 2.8 to 3 times higher than long (LPeI 34 - 36). Postpetiole thickly squamiform, in dorsal view around 2 times wider than long (DPpI 194 - 200); in lateral view thicker than petiolar node, around 1.8 to 1.9 times higher than long (LPpI 52 - 54). Mandibles finely longitudinally striate. Clypeus with mostly longitudinal rugae, stronger median carina present. Head with mostly longitudinal rugulation, dorsum of head with 8 to 10 widely spaced rugae between frontal carinae, often running to posterior margin of head. Spaces between dorsal rugae and scrobal area moderately reticulate-punctate. Mesosoma dorsally and laterally distinctly rugose, mostly longitudinally, spaces between rugae and propodeal declivity smooth and shiny. Both waist segments and gaster completely unsculptured, smooth and shiny. Head and mesosoma with numerous fine, long, erect hairs (14 to 16 on dorsum of mesosoma); petiole and postpetiole usually with 1 or 2 pairs each. First gastral tergite always without standing hairs. Pubescence on antennal scapes and tibiae appressed to decumbent. Coloration uniformly brown.

Paratype Specimen Labels

Type Material

Hita Garcia et al. (2010) - Holotype worker, SWAZILAND, 2-3 miles S of Mbabane, 2.-4.II.1962, leg. R.L. Ghent (Museum of Comparative Zoology) [examined]. Paratypes, 3 workers with same data as holotype (MCZ, The Natural History Museum) [examined].

References

  • Bolton, B. 1980. The ant tribe Tetramoriini (Hymenoptera: Formicidae). The genus Tetramorium Mayr in the Ethiopian zoogeographical region. Bull. Br. Mus. (Nat. Hist.) Entomol. 40: 193-384 (page 232, worker described)
  • Hita Garcia, F.; Fischer, G.; Peters, M. K. 2010. Taxonomy of the Tetramorium weitzeckeri species group (Hymenoptera: Formicidae) in the Afrotropical zoogeographical region. Zootaxa 2704:1-90.