Monomorium sahlbergi

In Yemen this species was collected from a banana farm where the soil was moist and rich in decaying livestock faeces. Several pselaphine beetles were also observed in the same habitat (Sharaf et al., 2017).

Identification
Worker caste of this species can be confused with the cosmopolitan species Monomorium pharaonis (L., 1758) but it can be separated by the finely longitudinally striated head, the smooth first gastral tergite, and the dark patches in front of the eyes (Sharaf et al., 2017).

Distribution
Boer et al. (2020): All records of M. sahlbergi originate from desert-like, urban, industrial, and military areas ranging from sea level to an elevation of 1800 m. It is not clear from our research what the original geographic region of M. sahlbergi was. Based on the distribution of other species in the salomonis group, the native distribution would include specimens from the Indomalaya region (Nepal, India, Thailand). Our data came from the following main geographic regions: Palearctic (China, Israel, Netherlands (interception)), Australian (New Zealand, from likely interceptions), Nearctic (USA, in part interceptions), Neotropical (Panama, Galapagos), Afrotropical (Reunion, Madagascar) and Oceania (Hawaii).

Distribution based on Regional Taxon Lists
Afrotropical Region: Socotra Archipelago, Yemen. Oriental Region: India, Pakistan, Sri Lanka. Palaearctic Region: China, Israel, Oman.

Biology
Sharaf et al (2018) - Oman: Several workers were found in leaf litter under a date palm tree where the soil was soft and dry.

Nomenclature

 * . Monomorium sahlbergi Emery, 1898c: 131, fig. (w., ergatoid q.) ISRAEL.
 * Senior synonym of dichroum: Boer et al., 2020: 93.
 * Status as species: Emery, 1908h: 684; Emery, 1922e: 174; Menozzi, 1933b: 65 (in key); Ettershank, 1966: 92; Kugler, J. 1988: 257; Bolton, 1995b: 266; Vonshak, et al. 2009: 43; Borowiec, L. 2014: 125.
 * dichroum. Monomorium dichroum Forel, 1902c: 212 (w.q.) INDIA (West Bengal, Karnataka, Maharashtra, Tamil Nadu).
 * Imai, et al. 1984: 7 (k.).
 * Status as species: Forel, 1903a: 688; Bingham, 1903: 202; Forel, 1908a: 3; Forel, 1911i: 221; Forel, 1918a: 721; Emery, 1922e: 173; Chapman & Capco, 1951: 164; Ettershank, 1966: 88; Bolton, 1995b: 261; Tiwari, 1999: 55; Guénard & Dunn, 2012: 45; Bharti, Guénard, et al. 2016: 39; Sharaf, Fisher, et al. 2017: 23; Sharaf, Fisher, et al. 2018: 25.
 * Junior synonym of sahlbergi: Boer et al., 2020: 93.

References based on Global Ant Biodiversity Informatics

 * Borowiec L. 2014. Catalogue of ants of Europe, the Mediterranean Basin and adjacent regions (Hymenoptera: Formicidae). Genus (Wroclaw) 25(1-2): 1-340.
 * Emery, C. "Beiträge zur Kenntniss der palaearktischen Ameisen." Öfversigt af Finska Vetenskaps-Societetens Förhandlingar (Helsinki) 20 (1898): 124-151.
 * Emery, C. "Beiträge zur Monographie der Formiciden des paläarktischen Faunengebietes. (Hym.) Teil V. Monomorium." Deutsche Entomologische Zeitschrift 1908 (1908): 663-686.
 * Ettershank G. 1966. A generic revision of the world Myrmicinae related to Solenopsis and Pheidologeton (Hymenoptera: Formicidae). Aust. J. Zool. 14: 73-171.
 * Forel A. 1902. Myrmicinae nouveaux de l'Inde et de Ceylan. Rev. Suisse Zool. 10: 165-249.
 * Forel A. 1903. Les Formicides de l'Empire des Indes et de Ceylan. Part X. J. Bombay Nat. Hist. Soc. 14: 679-715.
 * Forel A. 1911. Ameisen aus Ceylon, gesammelt von Prof. K. Escherich (einige von Prof. E. Bugnion). Pp. 215-228 in: Escherich, K. Termitenleben auf Ceylon. Jena: Gustav Fischer, xxxii + 262 pp.
 * Forel, A. 1908. Fourmis de Ceylan et d'Égypte récoltées par le Prof. E. Bugnion. Lasius carniolicus. Fourmis de Kerguelen. Pseudandrie? Strongylognathus testaceus. Bull. Soc. Vaudoise Sci. Nat. 44: 1-22
 * Martinez J. J. 2008. Firebreaks in planted pine forests in Israel: patches for Mediterranean Bata ants. Vie et Milieu 58(3/4): 233-236.
 * Narendra A., H. Gibb, and T. M. Ali. 2011. Structure of ant assemblages in Western Ghats, India: role of habitat, disturbance and introduced species. Insect Conservation and diversity 4(2): 132-141.
 * Rajan P. D., M. Zacharias, and T. M. Mustak Ali. 2006. Insecta: Hymenoptera: Formicidae. Fauna of Biligiri Rangaswamy Temple Wildlife Sanctuary (Karnataka). Conservation Area Series, Zool. Surv. India.i-iv,27: 153-188.
 * Ramachandra T. V., M. D. Subash Chandran, N. V. Joshi, A. Narendra, and T. M. Ali. 2012. Ant species composition and diversity in the Sharavathi Rivers basin, central Western Ghats. Sahyadri Conservation Series 3, ENVIS Technical Report 20. 51 pages.
 * Vonshak M., and A. Ionescu-Hirsch. 2009. A checklist of the ants of Israel (Hymenoptera: Formicidae). Israel Journal of Entomology 39: 33-55.