Current View: All Antweb
Change View
Cite this page

Citing AntWeb


To cite this page, please use the following:

· For print: . Accessed

· For web:

Species: Tapinoma sessile   (Say, 1836) 

Download Data

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


   (According to curated Geolocale/Taxon lists) Species is native to: Nearctic bioregion (based on species list records).

Nearctic Region: Canada, United States
Neotropical Region: Mexico
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 ground forager(s), 8 times ex sifted leaf litter, 3 times ants found under rock, 5 times under dead wood, ...

Collected most commonly using these methods: 52 times Bay Area Ant Survey (BAAS), 31 times Under rock, 91 times search, 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, 4 times Beating, ...

Elevations: collected from 5 - 3202 meters, 1497 meters average

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

See something amiss? Send us an email.
Enlarge Map