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. In the Osa region, a colony was found in necrotic cavities beneath the bracts of a live Costus inflorescence. (Longino 1997, Longino 2009).
See the description in the nomenclature section.
Keys including this Species
Widespread in wet forest to 800 m in Peñas Blancas and 2000 m in Braulio Carrillo (Longino 1997).
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
Check data from AntWeb
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- erratilis. Pheidole erratilis Wilson, 2003: 414, figs. (s.w.) COSTA RICA. Senior synonym of petersoni: Longino, 2009: 31.
- petersoni. Pheidole petersoni Wilson, 2003: 486, figs. (s.w.) COSTA RICA. Junior synonym of erratilis: Longino, 2009: 31.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
A relatively large, brown member of the flavens group distinguished by a combination of exceptionally long pilosity and prominent, “sharkfin” shape of the humerus in major and minor, and narrow occiput surmounted by a collar in the minor.
Similar to Pheidole petersoni of Costa Rica but with longer pilosity and absence of rugoreticulum on the mesosoma in both castes, and more extensive cephalic carinulae in the major (but less extensive in the minor).
MEASUREMENTS (mm) Holotype major: HW 1.06, HL 1.12, SL 0.62, EL 0.12, PW 0.48. Paratype minor: HW 0.56, HL 0.62, SL 0.60, EL 0.14, PW 0.34.
COLOR Major: gaster medium brown, tarsi dark yellow, rest of body and appendages light reddish brown.
Minor: body dark, almost blackish brown, appendages light reddish brown.
Figure. Upper: holotype, major. Lower: paratype, minor. Scale bars = 1 mm.
Holotype major worker and associated paratype minor worker: Costa Rica, Prov. Alajuela, 3km S Volcan Arenal, 10°26'N 84°42'W, 700m, 17 Feb 1994 (J. Longino) [[[INBC|Instituto Nacional de Biodiversidad]]] (examined).
Pheidole petersoni Holotype major worker and associated paratype minor worker: Costa Rica, Prov. Alajuela, Peñas Blancas, 10.300° N 84.751°W, 940m, 24 Jul 1984 (J. Longino) [[[INBC|Instituto Nacional de Biodiversidad]]] (examined).
L erratilis, wanderer, alluding to the wide range of habitats occupied in Costa Rica.
- Longino, J.T. 2009. Additions to the taxonomy of New World Pheidole. Zootaxa 2181: 1-90. PDF
- Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Harvard University Press, Cambridge, MA. (page 414, fig. major, minor described)