• Subspecies of Temnothorax sordidulus: Baroni Urbani, 1971c: 124; Bolton, 1995b: 245; Poldi et al., 1995: 5.
• Junior synonym of Temnothorax sordidulus: Seifert, 2006: 8
• Status as species: Csősz et al., 2015: 57 (redescription); Lebas et al., 2016: 374; Salata & Borowiec, 2018c: 39.

Obsolete combinations

• Leptothorax sordidulus tergestina

Citations

• Baroni Urbani, C. 1971c. Catalogo delle specie di Formicidae d'Italia (Studi sulla mirmecofauna d'Italia X). Memorie della Società Entomologica Italiana 50:5-287. PDF
• Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp.
• Csősz, S.; Heinze, J.; Mikó, I. 2015. Taxonomic synopsis of the Ponto-Mediterranean ants of Temnothorax nylanderi species-group. PLoS ONE 10 (11):62 pp. e0140000. 10.1371/journal.pone.0140000 PDF
• Finzi, B. 1928b. Quarto contributo alla conoscenza della fauna mirmecologica della Venezia Giulia. Bollettino della Società Entomologica Italiana 60:128-130. PDF
• Lebas, C.; Galkowski, C.; Blatrix, R.; Wegnez, P. 2016. Guide Delachaux: Fourmis d’Europe occidentale. Luçon: Delachaux et Niestlé, 415 pp.
• Poldi, B.; Mei, M.; Rigato, F. 1995 ("1994"). Hymenoptera Formicidae. Checklist delle Specie della Fauna Italiana 102:1-10.
• Salata, S.; Borowiec, L. 2018c. Taxonomic and faunistic notes on Greek ants (Hymenoptera: Formicidae). Annals of the Upper Silesian Museum in Bytom, Entomology 27 (008):1-51. 10.5281/zenodo.2199191 PDF
• Seifert, B. 2006. Temnothorax saxonicus (Seifert, 1995) stat.n., comb.n. – a parapatric, closely-related species of T. sordidulus (Müller, 1923) comb.n. and description of two new closely-related species, T. schoedli sp.n. and T. artvinense sp.n., from Turkey (Hymenoptera: Formicidae). Myrmecologische Nachrichten 8:1-12. PDF