Georegion: Americas
Change View
Cite this page

Citing AntWeb


To cite this page, please use the following:

· For print:      Citation: AntWeb. Version 8.64.2. California Academy of Science, online at Accessed .

· For web:

Species: Myrmecocystus (Myrmecocystus) testaceus   Emery, 1893 

Download Data

Taxonomic History (provided by Barry Bolton, 2021)

Myrmecocystus melliger var. testaceus Emery, 1893k PDF: 667 (w.) U.S.A. (California). Nearctic. AntCat AntWiki HOL

Taxonomic history

Snelling, 1976 PDF: 136 (q.m.)
As unavailable (infrasubspecific) name: Wheeler, 1908g PDF: 355; Wheeler, 1910a PDF: 571; Wheeler, 1912e PDF: 174 (in key); Emery, 1925d PDF: 239; Cole, 1937b PDF: 138; Smith, 1951c PDF: 856.
Status as species: Snelling, 1969b PDF: 6 (in text); Snelling, 1976 PDF: 135 (redescription); Yensen et al., 1977 PDF: 184; Smith, 1979: 1448; Snelling & George, 1979: 237; Allred, 1982: 489; Snelling, 1982b PDF: 84 (in key); Wheeler & Wheeler, 1986g PDF: 76; Bolton, 1995b: 275; Ward, 2005 PDF: 65.
// Distribution


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Mexico, United States
  Biogeographic regions (According to curated Bioregion/Taxon lists):

Distribution Notes:


Taxonomic Treatment (provided by Plazi)

Specimen Habitat Summary

Found most commonly in these habitats: 7 times found in chaparral, 6 times found in sagebrush, 2 times found in desert grassland, 1 times found in chapparal, 3 times found in sagebrush/pinyon-juniper, 1 times found in sagebrush/bitterbrush, 2 times found in Pinyon-cedar woodland, 1 times found in pinyon-juniper, 2 times found in shrub steppe, 1 times found in low sparse shrubs, ...

Found most commonly in these microhabitats: 7 times nest in soil, 8 times ground nest, 3 times nocturnal ground foragers, 1 times nest in rocky soil, 3 times ground foragers, 1 times foragers, 1 times crater nest in soil, 3 times crater nest, 2 times flat crater, 2 times at bait, 2 times strays, ...

Collected most commonly using these methods: 15 times search, 4 times hand collecting, 2 times direct collection, 2 times bait, 30 am 3 Jul 2016 and picked up 9 times transect of 5 ethylene glycol pitfall traps (28 mm internal diameter), set out 10, 1 times Applied water to the nest to bring several workers to the surface., 30 - 9 times Beating vegetation (Atriplex, Gutierrezia, Psorothamnus), 8, 0 times Berlese, 1 times pitfall trap.

Elevations: collected from 12 - 2625 meters, 1624 meters average

Collect Date Range: collected between 1947-10-05 and 2021-08-11

Type specimens: syntype of Myrmecocystus testaceus: casent0905691

See something amiss? Send us an email.