Monomorium sordidum

Monomorium sordidum is yet another very common Monomorium species in most Australian habitats (Heterick 2009).

Identification
Heterick (2009) - Shares many morphological similarities with the rothsteini species complex in both reproductive and worker castes. Moreover, these species and Monomorium megalops are the only Australian members of the M. monomorium group with 12-segmented antennae, the remaining members possessing 11-segmented antennae.

Distribution based on Regional Taxon Lists
Australasian Region: Australia.

Nomenclature

 *  sordidum. Monomorium sordidum Forel, 1902h: 443 (w.) AUSTRALIA. Heterick, 2001: 413 (q.m.). Combination in Chelaner: Ettershank, 1966: 97; in Monomorium: Taylor, 1987b: 4. Senior synonym of foreli, micron, nigriventris, squamigena, tostum: Heterick, 2001: 412.
 * nigriventris. Monomorium sordidum var. nigriventris Forel, 1910b: 29 (w.q.) AUSTRALIA. Combination in Chelaner: Ettershank, 1966: 97; in Monomorium: Taylor, 1987b: 4. Subspecies of sordidum: Taylor & Brown, D.R. 1985: 59. Junior synonym of sordidum: Heterick, 2001: 412.
 * foreli. Monomorium (Holcomyrmex) foreli Viehmeyer, 1914b: 32 (w.) AUSTRALIA. Combination in Chelaner: Ettershank, 1966: 97; in Monomorium: Taylor, 1987b: 2. Junior synonym of sordidum: Heterick, 2001: 412.
 * tostum. Monomorium rothsteini var. tostum Wheeler, W.M. 1915g: 806 (w.) AUSTRALIA. Combination in Chelaner: Ettershank, 1966: 97; in Monomorium: Taylor, 1987b: 3. Subspecies of rothsteini: Taylor & Brown, D.R. 1985: 58. Junior synonym of sordidum: Heterick, 2001: 412.
 * micron. Monomorium micron Crawley, 1925b: 593 (w.q.) AUSTRALIA. Junior synonym of sordidum: Heterick, 2001: 412.
 * squamigena. Monomorium rothsteini var. squamigena Viehmeyer, 1925a: 28 (w.) AUSTRALIA. Combination in Chelaner: Ettershank, 1966: 97; in Monomorium: Taylor, 1987b: 3. Subspecies of rothsteini: Taylor & Brown, D.R. 1985: 58. Junior synonym of sordidum: Heterick, 2001: 412.