Collingwood, C. A., 1979, The Formicidae (Hymenoptera) of Fennoscandia and Denmark., Fauna Entomologica Scandinavica 8, pp. 1-174: 62

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Genus Monomorium  HNS  Mayr, 1855

Monomorium  HNS  Mayr, 1855:452.

Type-species: Monomorium minutum Mayr  HNS  , 1855.

Worker. Head longer than broad, clypeus bicarinate. Palp formula 1:2 or 2:2. Antennae 11 or 12 segmented with distinct 3 segmented club as long as rest of funiculus - intermediate segments transverse. Mesopropodeal suture deeply marked; propodeum smoothly rounded, unarmed. Gaster basally emarginate with distinct anterior angles.

Queen. Head as in worker. Mesonotum long, overhanging pronotum. Wings with 1 cubital cell and no discoidal cell.

Male. Head in front of ocelli flat and broad; mandibles dentate. Antennae 13 segmented without distinct club; scape not as long as first 3 funicular segments. Mesonotum high, arched without notauli.

This is a worldwide genus with several hundred species mainly occurring in the tropics. There are several cosmopolitan tramp species one of which is well established in North Europe.