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Species: Tapinoma sessile   (Say, 1836) 

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See Also:

Tapinoma sessile_cf

Taxonomic History (provided by Barry Bolton, 2018)

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

Taxonomic history


 Species is native to: Nearctic bioregion (based on species list records).

Nearctic Region: Alabama, Alberta, Arizona, Arkansas, Baja California, British Columbia, California, Canada, Colorado, Florida, Georgia, Hidalgo, Idaho, Illinois, Indiana, Iowa, Kansas, Louisiana, Maine, Manitoba, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Jersey, New Mexico, New York, North America, North Carolina, North Dakota, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Sonora, South Carolina, South Dakota, Tennessee, Texas, United States, Utah, Virginia, Washington, West Virginia, Wisconsin, Wyoming
Neotropical Region: Americas, Central America, Chiapas, Mexico, Oaxaca
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, 0 times found in Mixed canyon forest, 2 times found in Meadow, 8 times found in cloud forest, 2 times found in Pinyon-cedar woodland, 5 times found in Aspen forest, ...

Found most commonly in these microhabitats: 29 times under stone, 11 times nest under stone, 6 times under rock, 10 times strays, 1 times found under dry vegetation, 4 times ex rotten log, 8 times nest under rock, 8 times ex sifted leaf litter, 5 times under dead wood, 5 times beating vegetation, 6 times ground foragers, ...

Collected most commonly using these methods: 31 times Under rock, 88 times search, 52 times Bay Area Ant Survey (BAAS), 53 times hand collecting, 24 times pitfall, 8 times Pitfall trap, 3 times Log stage 4, 1 times Log stage 2, 6 times under wood, 3 times baiting, 0 times Log stage 3, ...

Elevations: collected from 5 - 3202 meters, 1495 meters average

Type specimens: Lectotype: casent0172856, casent0172857; type of Tapinoma boreale: focol2872, focol2873

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