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Argentina, Bolivia (type locality), Peru, Brasil (SC, PR, PA), Guianas, Costa Rica, Honduras. Costa Rica: scattered localities above 800m.
Regarding this species, Brown (1965) states:
T. pusillus appears to be a soil dweller in cultivated and pampas areas as well as in forest (Kempf, 1961). It also seems to exist at higher elevations (e.g., in a coffee plantation at Venecia, near Medellin, Colombia). Probably it is strongly subterranean in foraging and nesting habits.
In Costa Rica I have collected this species from the north slope of Volcan Barba at 800m, just west of Monteverde at 900m, Cerro Cacao in the Guanacaste Conservation Area, and Pittier Biological Station at 1670m in the Cordillera de Talamanca. The Cerro Cacao collection was from beneath a stone under the stunted forest of Cerro Pedregal. The other collections were from Winkler samples of sifted litter from the forest floor. The collection from near Monteverde contained workers and a dealate queen.
Brown, W. L., Jr. 1965. Contributions to a reclassification of the Formicidae. IV. Tribe Typhlomyrmecini (Hymenoptera). Psyche (Camb.) 72:65-78.
Emery, C. 1906 ("1905"). Studi sulle formiche della fauna neotropica. XXVI. Bull. Soc. Entomol. Ital. 37:107-194.
Kempf, W. W. 1961. A survey of the ants of the soil fauna in Surinam (Hymenoptera: Formicidae). Stud. Entomol. 4:481-524.
Menozzi, C. 1927. Formiche raccolte dal Sig. H. Schmidt nei dintorni di San Jose di Costa Rica. Entomol. Mitt. 16:266-277.
Concepción (MHNG). Literature records: Pte. Hayes (Fowler 1981).
Found most commonly in these habitats: 48 times found in ridgetop cloud forest, isolated peak with oak trees, 23 times found in mature wet forest, 18 times found in montane wet forest, 10 times found in tropical wet forest, 5 times found in wet forest, 1 times found in 2º lowland rainforest, 1 times found in road edge, 2nd growth forest, 3 times found in cloud forest, 1 times found in isolated clearing in mature wet forest area, open lawn area at edge of building., 3 times found in lowland wet forest, ...
Found most commonly in these microhabitats: 111 times ex sifted leaf litter, 5 times under stone, 3 times in soil, 1 times nest in clay bank, 3 times Malaise trap, 2 times ex sifted litter, 1 times under stones, 2 times sifted litter (leaf mold, rotten wood), 1 times sifted litter, 1 times ex pan trap, 1 times Ex horjarasca, ...
Collected most commonly using these methods: 91 times miniWinkler, 12 times search, 15 times MaxiWinkler, 9 times Winkler, 4 times Malaise, 2 times pan trap, 1 times 6L sifted litter, extracted in Winkler sack over 44 hours, 1 times blue pan trap, 1 times Winkler48h, 1 times fogging, 1 times litter sample, ...
Elevations: collected from 50 - 1670 meters, 823 meters average
Collect Date Range: collected between 1891-01-01 and 2020-01-22
Type specimens: Holotype of Typhlomyrmex schmidti: casent0913587; Holotype Typhlomyrmex schmidti: jtl056095; paratype of Typhlomyrmex schmidti: casent0913588; Paratype Typhlomyrmex schmidti: jtl056096; syntype of Typhlomyrmex pusillus: casent0903807; syntype of Typhlomyrmex schmidti: casent0915318