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Costa Rica: Atlantic and southern Pacific lowlands.
This species occurs in lowland wet forest. Nests are often in the soil, often in clay banks. Workers recruit to baits on the forest floor and are occasionally collected in Winkler samples.
Longino excavated a nest in a clay bank at La Selva. It had an irregular tumulus of soil around a slit-shaped entrance. A tunnel opened out into a 3-5mm wide gallery extending into the bank. There was a small chamber near the surface and a larger chamber about 15cm deep (horizontal in bank); the nest was not fully excavated and it is unknown if the nest extended deeper. Among the workers were several peculiar intercastes. These look like developmental aberrations. Wilson's revision contains two species, pepo and sphaerica, with this kind of morphology, and it is possible they are similar aberrations.
|Pheidole hirsuta||n. sp.||Emery, C., 1896, Studi sulle formiche della fauna Neotropica., Bollettino della Societa Entomologica Italiana 28, pp. 33-107: 33-34, (download)||33-34||3798|
|Pheidole hirsuta||Wilson, E. O., 2003, Pheidole in the New World. A dominant, hyperdiverse ant genus., Cambridge, MA: Harvard University Press: 299, (download)||299||20017|
Found most commonly in these habitats: 27 times found in mature wet forest, 4 times found in mature moist forest, 4 times found in lowland rainforest, 8 times found in montane wet forest, 2 times found in rainforest, 1 times found in moist forest, 2 times found in wet forest, 3 times found in Sura, 3 times found in tropical rainforest, some big trees, 1 times found in pasture, ...
Found most commonly in these microhabitats: 31 times ex sifted leaf litter, 6 times at bait, 5 times Primary forest, 3 times nest in soil, 1 times nest in clay bank, 2 times pecan sandie bait, 1 times nest under stone, 4 times Hojarasca, 1 times nest in clay soil, 1 times ground nest, clay bank, 3 times bajo de M/24, ...
Collected most commonly using these methods: 29 times miniWinkler, 5 times search, 12 times baiting, 5 times bait, 5 times Lure/Bait, 5 times Winkler, 4 times flight intercept trap, 4 times Malaise, 2 times Sweeping, 1 times Unknown, 2 times Mini Winkler, ...
Elevations: collected from 10 - 860 meters, 279 meters average
Type specimens: syntype of Pheidole hirsuta: casent0904357