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Species: Tapinoma sessile   (Say, 1836) 

Download Data

See Also:

Tapinoma sessile_cf, Tapinoma sessile boreale

Taxonomic History (provided by Barry Bolton, 2017)

Formica sessilis Say, 1836 PDF: 287 (w.q.) U.S.A. Nearctic. AntCat AntWiki HOL

Taxonomic history


Nearctic Region: Alabama, Alberta, Arizona, Arkansas, Baja California, British Columbia, California, Colorado, Florida, Georgia, Hidalgo, Illinois, Louisiana, Maine, Maryland, Massachusetts, Mississippi, Missouri, Montana, Nevada, New Mexico, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, Washington, West Virginia, Wisconsin, Wyoming
Oceania Region: Hawaii

Distribution Notes:



Found in virtually all habitats, but most common in riparian, grassland and ruderal sites. Impermanent nests in preformed cavities and spaces.


Snelling list also recognizes a Tapinoma n. sp. From California.


The North American ants going by the name Tapinoma sessile are almost certainly a species complex, even with the exclusion of the following species.

Taxonomic Treatment (provided by Plazi)

Scientific Name Status Publication Pages ModsID GoogleMaps
Tapinoma sessile   Ward, P. S., 2005, A synoptic review of the ants of California (Hymenoptera: Formicidae)., Zootaxa 936, pp. 1-68: -1, (download) -1 21008
Tapinoma sessile   Hamm, C. A., 2010, Multivariate discrimination and description of a new species of Tapinoma from the Western United States., Annals of the Entomological Society of America 103, pp. 20-29: 24-25, (download) 24-25 23125 GoogleMaps

Specimen Habitat Summary

Found most commonly in these habitats: 16 times found in oak woodland, 23 times found in agricultural zone, 7 times found in Ponderosa pine forest, 9 times found in coastal scrub, 8 times found in shrub steppe, 2 times found in Meadow, 0 times found in Mixed canyon forest, 2 times found in Pinyon-cedar woodland, 5 times found in Aspen forest, 3 times found in pine forest, ...

Found most commonly in these microhabitats: 29 times under stone, 10 times nest under stone, 6 times under rock, 1 times found under dry vegetation, 4 times ex rotten log, 8 times nest under rock, 8 times strays, 4 times under dead wood, 6 times ground foragers, 4 times ground forager(s), 5 times stray foragers, ...

Collected most commonly using these methods: 31 times Under rock, 82 times search, 52 times Bay Area Ant Survey (BAAS), 53 times hand collecting, 23 times pitfall, 8 times Pitfall trap, 3 times Log stage 4, 1 times Log stage 2, 6 times under wood, 1 times Under boulder, 0 times Log stage 3, ...

Elevations: collected from 5 - 3202 meters, 1473 meters average

Type specimens: Lectotype: casent0172856, casent0172857; Paratype: fmnhins0000091174, fmnhins0000118975, fmnhins0000119220; type of Tapinoma boreale: focol2872, focol2873

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