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Species: Pheidole alfaroi   Emery, 1896 

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Taxonomic History (provided by Barry Bolton, 2023)

Pheidole alfaroi Emery, 1896g PDF: 70 (s.w.q.m.) COSTA RICA. Neotropic. Primary type information: Primary type material: lectotype major worker (by designation of Wilson, 2003a: 165). Primary type locality: lectotype Costa Rica: La Palma, 1500 m. (A. Alfaro). Primary type depository: MSNG. Secondary type information: Secondary type material: 1 paralectotype minor worker. Secondary type locality: same as for lectotype. Secondary type depository: MSNG. Type notes: Original description also cites syntype queens and males. AntCat AntWiki HOL

Taxonomic history

Lectotype designation: Wilson, 2003a: 165.
Status as species: Forel, 1899b PDF: 69; Forel, 1908c PDF: 48; Emery, 1922c PDF: 104; Kempf, 1972b PDF: 185; Bolton, 1995b: 316; Wilson, 2003a: 165 (redescription); Longino, 2019 PDF: 108; Serna et al., 2019 PDF: 920 (redescription).
// Distribution


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

Distribution Notes:

Costa Rica (uplands of Cordillera Central).


J. Longino, 27 Oct 2021: very similar to P. incisa Mayr 1870, from Colombia.


Wilson (2003) provisionally synonymized innupta Menozzi under alfaroi. So far, a pattern has held that leads us to treat them as two distinct species. alfaroi is dirty yellow and nests in dead wood on the ground. innupta is always black and nests under epiphytes, usually in the canopy. innupta and alfaroi are sympatric in the Vara Blanca area of Braulio Carrillo National Park.

diana Forel, with which alfaroi may be confused, is yellow, but lacks transverse striae on the vertex.


Wilson, E. O. 2003. Pheidole in the New World: A Dominant, Hyperdiverse Ant Genus. Harvard University Press, Cambridge, Mass

Taxonomic Treatment (provided by Plazi)

Scientific Name Status Publication Pages ModsID GoogleMaps
Pheidole alfaroi   Wilson, E. O., 2003, Pheidole in the New World. A dominant, hyperdiverse ant genus., Cambridge, MA: Harvard University Press: 165, (download) 165 20017
Pheidole alfaroi n. sp.  Emery, C., 1896, Studi sulle formiche della fauna Neotropica., Bollettino della Societa Entomologica Italiana 28, pp. 33-107: 38-39, (download) 38-39 3798
Pheidole alfaroi   Forel, A., 1908, Fourmis de Costa-Rica, récoltées par M. Paul Biolley., Bulletin de la Societe Vaudoise des Sciences Naturelles 44, pp. 35-72: 48, (download) 48 4014

Specimen Habitat Summary

Found most commonly in these habitats: 155 times found in montane wet forest, 37 times found in cloud forest, probably old second growth, matrix of dense bamboo and more open forest, 21 times found in cloud forest, old second growth forest, 6 times found in cloud forest, 5 times found in mature wet forest, 4 times found in cloud forest, old second growth, riparian, 2 times found in cloud forest, primary, along steep ridge near peak, 1 times found in 2nd growth cloud forest, 1 times found in montane wet forest edge, 1 times found in cloud forest, old second growth, matrix of forest and open bamboo areas, ...

Found most commonly in these microhabitats: 68 times Hojarasca, 48 times ex sifted leaf litter, 21 times at bait, 1 times in dead tree, 9 times Hojarasca, bosque, 1 times nest under rock in pasture, 7 times Hojarasca, en bosque paralelo al sendero gradiente fuerte y al lado de paredon, 1 times nest in soil, 1 times under epiphytes on dead wood on ground, 1 times at arroz con pollo bait, 4 times Hojarasca, mature forest, dropping, ...

Collected most commonly using these methods: 104 times Mini Winkler, 13 times search, 37 times miniWinkler, 30 times Malaise, 22 times baiting, 11 times Berlese, 5 times Winkler, 5 times maxiWinkler, 4 times flight intercept trap, 1 times beating.

Elevations: collected from 890 - 1590 meters, 1416 meters average

Collect Date Range: collected between 1895-07-01 00:00:00.0 and 2015-06-30 00:00:00.0

Type specimens: Lectotype of Pheidole alfaroi: casent0904396; paralectotype of Pheidole alfaroi: casent0904397

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