Pheidole inversa

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Pheidole inversa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. inversa
Binomial name
Pheidole inversa
Forel, 1901

Pheidole inversa casent0901580 p 1 high.jpg

Pheidole inversa casent0901580 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of inversa.


See the description in the nomenclature section.

Keys including this Species


Northern lowland Colombia and Curaçao. (Wilson 2003)

Distribution based on Regional Taxon Lists

Neotropical Region: Colombia (type locality).

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.

  • inversa. Pheidole radoszkowskii var. inversa Forel, 1901e: 363 (s.w.) COLOMBIA. Raised to species: Wilson, 2003: 197.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.


From Wilson (2003): A small reddish brown, nearly hairless member of the diligens group, close to Pheidole bruesi of Grenada, Pheidole diligens and Pheidole laidlowi of Brazil, and the widespread and very abundant Neotropical Pheidole radoszkowskii and Pheidole triconstricta. P. inversa is distinguished from all these species by the following combination of traits.

Major: anterior two-thirds of head longitudinally carinulate, posterior one-third smooth and shiny; cephalic rugoreticulum absent; petiolar node relatively thick in side view; anterior three-fourths of median strip of first gastral tergite shagreened and opaque. Minor: posterior two-thirds of median strip of first gastral tergite shagreened and opaque.

This form and Pheidole bruesi, as well as Pheidole diligens, may prove to fall within the substantial variation of Pheidole radoszkowskii and thus become synonymous.

MEASUREMENTS (mm) Lectotype major: HW 1.02, HL 1.08, SL 0.80, EL 0.20, PW 0.50. Paralectotype minor: HW 0.56, HL 0.64, SL 0.76, EL 0.16, PW 0.38.

COLOR Major: body light reddish brown; appendages brownish yellow.

Minor: concolorous light reddish brown.

Pheidole inversa Wilson 2003.jpg

Figure. Upper: lectotype, major (upper mesosomal profile, lectotype; lower mesosomal profile, major from Curaçao). Lower: paralectotype, minor. Scale bars = 1 mm.

Syntype Specimen Labels

Type Material

COLOMBIA: Barranquilla. Lectotype and paralectotype: National Museum of Natural History Paralectotypes: Musee d'Histoire Naturelle Genève - as reported in Wilson (2003)


L inversa, turned upside down, allusion unknown. (Wilson 2003)


  • Forel, A. 1901j. Variétés myrmécologiques. Ann. Soc. Entomol. Belg. 45: 334-382 (page 363, soldier, worker described)
  • Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Harvard University Press, Cambridge, MA. (page 197, fig. major, minor described; raised to species: new status)