Pheidole ulothrix

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Pheidole ulothrix
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. ulothrix
Binomial name
Pheidole ulothrix
Wilson, 2003

Pheidole ulothrix inbiocri002279936 p 1 high.jpg

Specimen Label

Inhabits wet forest (Longino 1997).


See the description in the nomenclature section.

Keys including this Species


Atlantic slope of Costa Rica (Longino 1997).

Latitudinal Distribution Pattern

Latitudinal Range: 10.35° to 9.15°.

Tropical South

Distribution based on Regional Taxon Lists

Neotropical Region: Costa Rica (type locality), Panama.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb






The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • ulothrix. Pheidole ulothrix Wilson, 2003: 530, figs. (s.w.) COSTA RICA.

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


DIAGNOSIS A medium-sized light brown (major) to yellow (minor) species distinguished in the major by curved, subrecumbent hairs (hence “woolly” hairs) all along the mesosomal dorsum; longitudinal carinulae covering all of the head except the occiput, mid-clypeus, and frontal triangle; lack of rugoreticulum anywhere; and broadly oval postpetiolar node.

Similar to Pheidole delicata, but delicata has longer pilosity, none of which is “woolly,” shorter propodeal spines, narrow petiolar node apex, and other details in body form, sculpturing, and pilosity as shown.

See also the less similar Pheidole alticola, Pheidole chalca and Pheidole hazenae.

MEASUREMENTS (mm) Major: HW 0.98, HL 0.96, SL 0.58, EL 0.12, PW 0.46. Minor: HW 0.50, HL 0.54, SL 0.54, EL 0.10, PW 0.30.

COLOR Major: gaster light brown; rest of body, as well as appendages, medium to dark yellow.

Minor: gaster brownish yellow, rest of body medium yellow, appendages light yellow.

Pheidole ulothrix Wilson 2003.jpg

Figure. Upper: holotype, major. Lower: paratype, minor. Scale bars = 1 mm.

Type Material

COSTA RICA: Braulio Carillo National Park, Heredia, 500 m, col. J. T. Longino. Instituto Nacional de Biodiversidad


Gr ulothrix, woolly haired, referring to the hairs on the mesosomal dorsum.


References based on Global Ant Biodiversity Informatics

  • Donoso D. A. 2014. Assembly mechanisms shaping tropical litter ant communities. Ecography 37 doi: 10.1111/j.1600-0587.2013.00253.x
  • Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
  • Longino J. T. L., and M. G. Branstetter. 2018. The truncated bell: an enigmatic but pervasive elevational diversity pattern in Middle American ants. Ecography 41: 1-12.