- 1 Identification
- 2 Distribution
- 3 Biology
- 4 Castes
- 5 Nomenclature
- 6 References
Rigato (2011) - This is the smallest (especially the gyne) West European Stenamma, characterised, in both the female castes and the male, by finer and more longitudinally arranged rugulation on head (especially on frons and vertex) and promesonotum; the integument in females looks also somewhat shinier than in other species. Furthermore, the worker has moderately long propodeal spines (PSI nearly always > 1.6 and sometimes even > 2.00), and both female castes have scapes almost reaching the posterior margin of the head when laid back. The waist appears somewhat stocky and with petiolar sternite straight and postpetiolar sternite shorter than usual. Males have relatively weakly developed mandibles and a peculiar propodeal dorsum sculpturation: strongly finely reticulate-punctate with several transverse rugulae.
A quite distinctive species because of its small size, more regular longitudinal sculpturation, propodeal spines length and waist structure. The workers may be superficially confused with small specimens of Stenamma debile.
After the examination of dozens of S. striatulum workers, I discovered that in profile the short, shallow, somewhat rectangular prominence of the postpetiolar sternite in S. striatulum is about 40% of PPH; whereas the same structure in other species is > 50% of PPH. This feature seems consistent and allows the recognition of S. striatulum female castes at a glance.
Males of S. striatulum are easily recognizable by their combination of strongly sculptured propodeal dorsum and slightly reduced 4- to 5-toothed mandibles, and by their low SI (< 45) and TI (< 135).
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
Widespread and locally common in South Europe from Spain to Greece, and also occurring in Anatolia.
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.
- striatulum. Stenamma westwoodi var. striatulum Emery, 1895c: 300 (footnote) (w.q.) ITALY. Kutter, 1971: 259 (m.). Raised to species: Müller, 1923: 46. Senior synonym of tscherkessicum: Arnol'di, 1975: 1822. See also: Kutter, 1971: 263; Kutter, 1977c: 74; DuBois, 1998b: 259; Rigato, 2011: 13.
- tscherkessicum. Stenamma westwoodi var. tscherkessicum Arnol'di, 1928b: 214 (q.) RUSSIA. Junior synonym of striatulum: Arnol'di, 1975: 1822.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Rigato (2011) - TL 2.9–3.4; HL 0.67–0.78; HW 0.57–0.67; CI 83–89; SL 0.53–0.62; SI 89–97; PCI 26–34; PnW 0.38–0.46; AL 0.77–0.97; PSI 1.59–2.00; PeL 0.28–0.35; PPL 0.18–0.21; PeH 0.18–0.22; PPH 0.18–0.23; PeW 0.14–0.17; PPW 0.19–0.23; PI1 57–67; PI2 46–55; MTL 0.43–0.52; TI 73–81 (24 measured).
Rigato (2011) - TL 3.5–3.8; HL 0.75–0.80; HW 0.65–0.71; CI 85–90; SL 0.59–0.62; SI 86–91; PCI 24–32; AL 1.02–1.11; PSI 1.61–2.08; ScW 0.52–0.56; MnL 0.70–0.79; PeL 0.32–0.37; PPL 0.20–0.23; PeH 0.23–0.25; PPH 0.24–0.25; PeW 0.16–0.19; PPW 0.23–0.27; PI1 58–66; PI2 49–54; MTL 0.50–0.57; TI 77–82 (9 measured).
Rigato (2011) - TL 3.1–3.4; HL 0.55–0.56; HW 0.47–0.48; CI 85–86; SL 0.17–0.20; SI 36–42; AL 1.05–1.12; ScW 0.50–0.54; MnL 0.74–0.77; PeL 0.31–0.34; PPL 0.19–0.20; PeH 0.20–0.21; PPH 0.19–0.20; PeW 0.16–0.17; PPW 0.21–0.23; PI1 59–62; PI2 66–71; MTL 0.60–0.64; TI 128–133 (3 measured).
Rigato (2011) - 2 syntype workers and 1 dealate gyne, ITALY: Capodimonte [Naples], 30.iii.72 (C. Emery) [not examined]. 1 syntype alate gyne, ITALY: PIEMONTE “776” [handwritten by Gribodo] (Gribodo) (Museo Civico di Storia Naturale, Genoa) [not examined].
- Arnol'di, K. V. 1975. A review of the species of the genus Stenamma (Hymenoptera, Formicidae) of the USSR and description of new species. Zool. Zh. 5 54: 1819-1829 (page 1822, Senior synonym of tscherkessicum)
- 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 259, see also)
- Emery, C. 1895d. Beiträge zur Kenntniss der nordamerikanischen Ameisenfauna. (Schluss). Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 8: 257-360 (page 300, worker, queen described)
- Kutter, H. 1971. Taxonomische Studien an schweizer Ameisen (Hymenopt., Formicidae). Mitt. Schweiz. Entomol. Ges. 43: 258-271 (page 259, male described; page 263, see also)
- Kutter, H. 1977c. Hymenoptera, Formicidae. Insecta Helv. Fauna 6: 1-298 (page 74, see also)
- Müller, G. 1923b. Le formiche della Venezia Guilia e della Dalmazia. Boll. Soc. Adriat. Sci. Nat. Trieste 28: 11-180 (page 46, Raised to species)
- 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