Seemingly this is a Sardinian endemic, but maybe it occurs also in Corsica (Rigato & Toni, 2011).
- 1 Identification
- 2 Distribution
- 3 Biology
- 4 Castes
- 5 Nomenclature
- 6 References
Rigato (2011) - This species has no unique strong diagnostic features, but, besides its distribution, it is recognisable by the following combination of worker characters: the values of SI (usually ≥ 90) and PCI (range: 25–34) plus relatively low and elongate postpetiole and irregular promesonotal sculpturation. The gyne is similar, except for the sculpturation.
At a glance sardoum female castes were easily separated from co-occurring specimens of debile because females of sardoum are mostly ferrugineous, distinctly paler than the brown debile, even though colour differences are generally considered unreliable. Also, in sardoum petiolar and postpetiolar sternites in profile look distinctly, although weakly, more concave below the nodes. In contrast, the waist sternites of Stenamma debile are only faintly concave at most. This difference is easier to appreciate when specimens of both species are compared directly. Stenamma sardoum female castes generally look similar to Stenamma westwoodii. Diagnostic features useful to separate them are difficult to appreciate and rely on difference in PCI, promesonotal sculpturation and shape of postpetiole.
Keys including this Species
- Key to Oriental and Palearctic Stenamma
- Key to Stenamma westwoodii species-group males of Western Europe and North African
- Key to Stenamma westwoodii species-group queens of Western Europe and North African
- Key to Stenamma westwoodii species-group workers of Western Europe and North African
Seemingly a relatively common Sardinian endemic. (Rigato 2011)
Distribution based on Regional Taxon Lists
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.
- sardoum. Stenamma sardoum Emery, 1915a: 255, pl. 4, figs. 5, 6 (w.q.) ITALY (Sardinia). See also: DuBois, 1998b: 237; Rigato, 2011: 11.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Emery (1915) described Stenamma sardoum on the basis of a few workers and one gyne, comparing it with Stenamma westwoodii of earlier authors (i.e. specimens now known to be Stenamma debile) and pointed out the strong difference in the shape of the petiolar node that he described as truncate in profile. Actually, Emery was quite wrong in reporting such a feature, even adding a misleading figure. I examined the type series and several other specimens of S. sardoum and all of them have an ordinary, somewhat rounded node in profile with a faint flattening at most. DuBois (1998) designated the lectotype and redescribed S. sardoum. In his keys he stated that the petiolar node was “depressed”. Nevertheless his drawings showed a petiolar profile comparable to that of most Stenamma.
Rigato (2011) - Lectotype (designated by DuBois (1998)): TL 3.6; HL 0.87; HW 0.72; CI 83; SL 0.66; SI 92; PnW 0.48; AL 1.00; PeL 0.38; PPL 0.26; PeH 0.20; PPH 0.21; PeW 0.16; PPW 0.21; PI1 68; PI2 53; MTL 0.61; TI 85.
Paralectotype: TL 3.6–3.9; HL 0.86–0.91; HW 0.72–0.77; CI 84–85; SL 0.67–0.70; SI 89–93; PnW 0.48–0.51; AL 1.04–1.10; PeL 0.38–0.42; PPL 0.26–0.29; PeH 0.20–0.23; PPH 0.21–0.23; PeW 0.15–0.18; PPW 0.20–0.23; PI1 68–69; PI2 53–55; MTL 0.61–0.65; TI 84–86 (3 measured).
TL 3.3–4.3; HL 0.81–0.91; HW 0.67–0.76; CI 82–85; SL 0.63–0.70; SI 89–96; PCI 25–34; PnW 0.43–0.51; AL 0.95–1.11; PSI 1.58–1.88; PeL 0.37–0.42; PPL 0.23–0.27; PeH 0.19–0.22; PPH 0.18–0.22; PeW 0.15–0.17; PPW 0.19–0.23; PI1 62–69; PI2 51–57; MTL 0.56–0.65; TI 81–89 (17 measured).
Rigato (2011) - Paralectotype: TL 4.5; HL 0.95; HW 0.82; CI 86; SL 0.74; SI 90; ScW 0.64; MnL 1.01; PeL 0.48; PPL 0.33; PeH 0.25; PPH 0.26; PeW 0.20; PPW 0.28; PI1 69; PI2 59; MTL 0.72; TI 88.
TL 4.4–5.0; HL 0.92–1.01; HW 0.79–0.85; CI 84–86; SL 0.71–0.76; SI 89–90; PCI 30–34; AL 1.28–1.40; PSI 1.60–2.10; ScW 0.64–0.68; MnL 0.92–1.01; PeL 0.47–0.50; PPL 0.31–0.33; PeH 0.25; PPH 0.24–0.26; PeW 0.20–0.21; PPW 0.26–0.28; PI1 66; PI2 59; MTL 0.66–0.73; TI 84–86 (2 measured).
Rigato (2011) - Lectotype worker, paralectotype workers and gyne, ITALY: SARDINIA, Aritzo, xi.1911 (D. Dodero) (Museo Civico di Storia Naturale, Genoa) [examined].
Rigato (2011) - X. Espadaler (pers. comm.) has assigned the single specimen reported from Spain by Collingwood and Yarrow (1969) to Stenamma debile.
- Bharti, H.; Gul, I.; Sharma, Y. P. 2012. Two new species of Stenamma (Hymenoptera: Formicidae) from Indian Himalaya with a revised key to the Palaearctic and Oriental species. Sociobiology. 59:317-330. PDF
- DuBois, M. B. 1998a. A revision of the ant genus Stenamma in the Palaearctic and Oriental regions (Hymenoptera: Formicidae: Myrmicinae). Sociobiology 29: 193-403 (page 237, see also)
- Emery, C. 1915a. Contributo alla conoscenza delle formiche delle isole italiane. Descrizione di forme mediterrannee nuove o critiche. Ann. Mus. Civ. Stor. Nat. 46[=(3)(6): 244-270 (page 255, pl. 4, figs. 5, 6 worker, queen described)
- Rigato, F. 2011. Contributions to the taxonomy of West European and North African Stenamma of the westwoodii species-group. (Hymenoptera Formicidae). Memorie della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano. 37:1-56. PDF
- Rigato, F.; Toni, I. 2011. Short notes 21. Hymenoptera, Formicidae. Pp. 873-882 in: Nardi, G.; Whitmore, D.; Bardiani, M.; Birtele, D.; Mason, F.; Spada, L.; Cerretti, P. (eds.) 2011. Biodiversity of Marganai and Montimannu (Sardinia). Research in the framework of the ICP Forests network. Conservazione Habitat Invertebrati, 5. Sommacampagna, Verona: Cierre Edizioni, 896 pp.