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Species: Pheidole erratilis   Wilson, 2003 

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Taxonomic History (provided by Barry Bolton, 2020)

Pheidole erratilis Wilson, 2003A: 414, figs. (s.w.) COSTA RICA. Neotropic. AntCat AntWiki HOL

Taxonomic history

Senior synonym of Pheidole petersoni: Longino, 2009 PDF: 31.


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Costa Rica, Nicaragua
  Biogeographic regions (According to curated Bioregion/Taxon lists):

Distribution Notes:

Nicaragua, Costa Rica. Costa Rica: widespread in wet forest areas, to 2000m in Braulio Carrillo, to 800m in Penas Blancas.


This species occurs in wet forest habitats, from sea level to 1400m elevation. Nests are in rotten wood or dead sticks on or near the forest floor. Workers are occasionally collected in Winkler or Berlese samples, but have not been collected at baits.


Additional collections of this species have blurred the distinction between erratilis and petersoni. There appears to be one species with variable sculpture on the pronotum. The images on this page are from the same nest series as the holotype of erratilis. Click here to see the old petersoni page, which contains images from the nest series of the holotype of petersoni.

Taxonomic Treatment (provided by Plazi)

Scientific Name Status Publication Pages ModsID GoogleMaps
Pheidole erratilis   Longino, J. T., 2009, Additions to the taxonomy of New World Pheidole (Hymenoptera: Formicidae)., Zootaxa 2181, pp. 1-90: 31, (download) 31 22820
Pheidole erratilis new species  Wilson, E. O., 2003, Pheidole in the New World. A dominant, hyperdiverse ant genus., Cambridge, MA: Harvard University Press: 414, (download) 414 20017

Specimen Habitat Summary

Found most commonly in these habitats: 8 times found in mature wet forest, 2 times found in ridgetop cloud forest, 3 times found in wet forest, 4 times found in montane wet forest, 1 times found in rainforest, 1 times found in wet forest stream edge, 1 times found in 2nd growth wet forest, 2 times found in ridgetop cloud forest, isolated peak with oak trees.

Found most commonly in these microhabitats: 11 times ex sifted leaf litter, 1 times under epiphytes, 1 times wet forest; in dead wood on ground, 3 times Sobre Vegetacion, 1 times in Cecropia polyphlebia internodes, 1 times at bait, 1 times nest in dead stem, 1 times beating veg., 1 times Wet forest. Ex sifted leaf litter., 1 times OTS 93-1 student project, K. Schultz, nests in Lecythis pods on ground, pod #601, 1 times at baits, ...

Collected most commonly using these methods: 3 times search, 7 times miniWinkler, 5 times Winkler, 2 times baiting, 3 times Sweeping, 1 times beating, 1 times Malaise.

Elevations: collected from 50 - 1420 meters, 740 meters average

Type specimens: holotype major Pheidole erratilis: inbiocri001282706; holotype major Pheidole petersoni: inbiocri002279955; paratype Pheidole erratilis: inbiocri001238400, inbiocri001282245, inbiocri001282705, inbiocri001283252, inbiocri001283254, inbiocri002279716, inbiocri002279929, inbiocri002279930, inbiocri002279931, inbiocri002279932, inbiocri002279933, inbiocri002279934, inbiocri002279935

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