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Genus: Liometopum   Mayr, 1861 


Current Valid Name:

Taxonomic History (provided by Barry Bolton, 2022)

Extant: 7 valid species

Fossil: 20 valid species

Liometopum Mayr, 1861 PDF: 38. Type-species: Formica microcephala, by monotypy. AntCat AntWiki

Taxonomic history

Liometopum in Dolichoderinae: Forel, 1878c PDF: 383 [Dolichoderidae]; Emery & Forel, 1879 PDF: 454 [Dolichoderidae]; Dalla Torre, 1893 PDF: 163; Emery, 1895l PDF: 771; Forel, 1899f PDF: 104; Wheeler, 1910a PDF: 142.
Liometopum in Dolichoderidae: Ashmead, 1905c PDF: 384.
Liometopum in Dolichoderinae, Tapinomini: Emery, 1913a PDF: 19; Wheeler, 1915i PDF: 95; Forel, 1917 PDF: 248; Bondroit, 1918 PDF: 87; Wheeler, 1922: 688; Carpenter, 1930 PDF: 46; subsequent authors except those below; then Jaffe, 1993: 9; Ward et al., 2010 PDF: 361.
Genus Liometopum references
Roger, 1863b PDF: 14 (catalogue); Mayr, 1863a PDF: 427 (catalogue); Mayr, 1865 PDF: 9 (diagnosis); Forel, 1878c PDF: 383 (diagnosis); André, 1882c PDF: 220 (Europe & Algeria species); Cresson, 1887 PDF: 258 (U.S.A. catalogue); Dalla Torre, 1893 PDF: 162 (catalogue); Bingham, 1903 PDF: 289 (diagnosis); Wheeler, 1905h PDF: 322 (North America species); Emery, 1913a PDF: 19 (diagnosis, catalogue); Creighton, 1950a PDF: 338 (North America species key); Chapman & Capco, 1951 PDF: 192 (Asia checklist); Gregg, 1963: 438 (U.S.A., Colorado species key); Bernard, 1967a PDF: 253 (diagnosis); Smith, 1979: 1417 (North America catalogue); Wheeler & Wheeler, 1986g PDF: 55 (U.S.A., Nevada species key); Shattuck, 1992c PDF: 121 (diagnosis, review of genus); Shattuck, 1994 PDF: 128 (catalogue); Bolton, 1995a PDF: 1050 (census); Bolton, 1995b: 247 (catalogue); Mackay & Mackay, 2002 PDF: 232 (U.S.A., New Mexico species key); Del Toro et al., 2009 PDF: 306 (all species revision, key); Dlussky et al., 2015 PDF (diagnosis for fossil imprints); Cantone, 2017 PDF: 121 (brief male diagnosis); Borowiec & Salata, 2022 PDF: 40 (diagnosis).

Taxon Page Images:

A busy trail of velvety tree ants (Liometopum occidentale). Solano County, California, USA
Image © Alex Wild. // Distribution


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Canada, Mexico, United States
    Asia: China, Georgia, India, Iran, Israel, North Korea, Turkey
    Europe: Albania, Austria, Balearic Islands, Bulgaria, Croatia, Czech Republic, Greece, Hungary, Italy, Macedonia, Moldova, Montenegro, Romania, Russia, Slovakia, Slovenia, Switzerland
  Biogeographic regions (According to curated Bioregion/Taxon lists):
    Indomalaya, Nearctic, Neotropical, Palearctic
  Native biogeographic regions (according to species list records):
    Indomalaya, Nearctic, Neotropical, Palearctic


The biology, ecology, and behavior of the North American species of Liometopum were reviewed by Hoey-Chamberlain et al. (2013)
Workers are generalist scavengers and predators, and also tend various plant-feeding insects for honeydew.


In the context of the North American Dolichoderinae, Liometopum is readily recognized by boxy mesosoma ("thorax") with an continuously convex profile, i.e. the metanotal groove is not impressed. In addition, workers are continuously polymorphic and often have conspicuous foraging behavior.

Taxonomic Treatment (provided by Plazi)

Scientific Name Status Publication Pages ModsID GoogleMaps
Liometopum   Mayr, G., 1862, Myrmecologische Studien., Verhandlungen der Zoologisch-Botanischen Gesellschaft in Wien 12, pp. 649-776: 703, (download) 703 4445
Liometopum   Ward, P. S., 2005, A synoptic review of the ants of California (Hymenoptera: Formicidae)., Zootaxa 936, pp. 1-68: 27, (download) 27 21008

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