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Found most commonly in these habitats: 2 times found in desert grassland, 5 times found in chaparral, 3 times found in sagebrush, 1 times found in chapparal, 2 times found in shrub steppe, 1 times found in Pebbly sage wash, 1 times found in pine/oak woods and open sage areas, 0 times found in Pinyon-cedar woodland, 1 times found in pinyon/juniper woodland, 1 times found in Sarcobatus scrub, ...
Found most commonly in these microhabitats: 2 times nest in soil, 1 times nest in rocky soil, myrmecocystus actively foraging on surface times open sagebrush/bitterbrush. 2244, 1 times crater nest in soil, 2 times strays, 1 times nest w pebble spread, 1 times nest under rock, 2 times ground nest with crater, 1 times ground nest wih mound ca. 20cm across, 2 times crater nest, 1 times under stone, ...
Collected most commonly using these methods: 6 times search, 4 times hand collecting, 0 times Flat crater, 0 times Crater in silt, 1 times foraging off the road, 0 times Large silty crater, 1 times pitfall trap, 1 times Applied water to the nest to bring several workers to the surface., 0 times Berlese.
Elevations: collected from 40 - 2290 meters, 1493 meters average
Type specimens: syntype of Myrmecocystus testaceus: casent0905691