biostudies-literature00450Unknown979Boer PThe discovery in the Netherlands in a shipping container of the ant <i>Monomorium sahlbergi</i> Emery, 1898, a species similar to the invasive pharaoh ant <i>M. pharaonis</i> (Linnaeus, 1758), led to a quest to better define the distribution of this species, which was initially obscure due to uncertain specimen identifications. Here it is shown that <i>M. sahlbergi</i>, like <i>M. pharaonis</i>, is found worldwide, almost certainly as a result of introductions. Including quarantine interceptions, this species is recorded from seven global biogeographic regions, but its established outdoor distribution is currently limited to the tropics and subtropics. <i>Monomorium dichroum</i> Forel, 1902 is here presented as a junior synonym of <i>M. sahlbergi</i> <b>syn. nov.</b> based on morphometric and CO1 analyses.ZooKeys87-97https://www.ebi.ac.uk/biostudies/studies/S-EPMC7609494biostudies-literature<i>Monomorium sahlbergi</i> Emery, 1898 (Formicidae, Hymenoptera): a cryptic globally introduced species.PMC7609494Boer PBakker FBeentjes KLoss ACFisher BL45false<i>Monomorium sahlbergi</i> Emery, 1898 (Formicidae, Hymenoptera): a cryptic globally introduced species.The discovery in the Netherlands in a shipping container of the ant <i>Monomorium sahlbergi</i> Emery, 1898, a species similar to the invasive pharaoh ant <i>M. pharaonis</i> (Linnaeus, 1758), led to a quest to better define the distribution of this species, which was initially obscure due to uncertain specimen identifications. Here it is shown that <i>M. sahlbergi</i>, like <i>M. pharaonis</i>, is found worldwide, almost certainly as a result of introductions. Including quarantine interceptions, this species is recorded from seven global biogeographic regions, but its established outdoor distribution is currently limited to the tropics and subtropics. <i>Monomorium dichroum</i> Forel, 1902 is here presented as a junior synonym of <i>M. sahlbergi</i> <b>syn. nov.</b> based on morphometric and CO1 analyses.2020-01-01T00:00:00Z20202024-11-15T19:38:57.059Z2020-11-19T17:00:27ZS-EPMC76094943319213210.3897/zookeys.979.55342