Messor caducus

Distribution
This taxon was described from Russia.

Nomenclature

 *  caducus. Formica caduca Victor, 1839: 47, pl. 2, fig. d (w.) RUSSIA. Combination in Aphaenogaster: Roger, 1863b: 29; in Stenamma (Messor): Emery, 1898c: 125; in Messor: Ruzsky, 1905b: 754. Junior synonym of barbarus: Roger, 1863b: 29; Emery & Forel, 1879: 461; Nasonov, 1889: 37. Revived from synonymy as subspecies of barbarus: Emery, 1891b: 12. Revived status as species: Ruzsky, 1905b: 754. Material of the unavailable name semirubra referred here by Arnol'di, 1977b: 1638. Senior synonym of meridionalis: Atanassov & Dlussky, 1992: 121; of caucasicola: Arakelian, 1994: 34. Current subspecies: nominal plus glabrescens. See also: Agosti & Collingwood, 1987a: 54; Baroni Urbani, Aktaç & Camiltepe, 1989: 291.
 * caucasicola. Messor caducus subsp. caucasicola Arnol'di, 1977b: 1639 (w.q.m.) CAUCASUS. Junior synonym of caducus: Arakelian, 1994: 34.