Pheidole karolsetosa

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Pheidole karolsetosa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. karolsetosa
Binomial name
Pheidole karolsetosa
Longino, 2009

Pheidole karolsetosa casent0609023 p 1 high.jpg

Pheidole karolsetosa casent0609023 d 1 high.jpg

Specimen Labels

Pheidole karolsetosa occurs in mature wet forest leaf litter. It is known only from Winkler samples of leaf litter from 300-500m elevation on the Barva Transect in Braulio Carrillo National Park.


See the description section.


Distribution based on Regional Taxon Lists

Neotropical Region: Costa Rica (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.

  • karolsetosa. Pheidole karolsetosa Longino, 2009: 44, fig. 11 (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.



Minor. Measurements (paratype): HL 0.44, HW 0.42, HLA 0.13, SL 0.35, EL 0.09, ML 0.45, PSL 0.06, PMG 0.00, SPL 0.03, PTW 0.09, PPW 0.11, CI 94, SI 85, PSLI 14, PMGI 0, SPLI 6, PPI 120.

Measurements (n=7): HL 0.39-0.44, HW 0.38-0.43, SL 0.33-0.37, CI 94-99, SI 84-89.

Differing from P. karolmorae only in the diagnostic characters (below).

Major. Measurements (holotype): HL 0.85, HW 0.78, HLA 0.18, SL 0.41, EL 0.11, ML 0.58, PSL 0.08, PMG 0.00, SPL 0.03, PTW 0.13, PPW 0.20, IHT 0.14, OHT 0.28, CI 92, SI 53, PSLI 10, PMGI 0, SPLI 4, PPI 158, HTI 51.

Measurements (n=9): HL 0.77-0.85, HW 0.75-0.80, SL 0.38-0.41, CI 92-98, SI 50-54.

Differing from P. karolmorae only in the diagnostic characters (below).

Very similar to the sympatric Pheidole karolmorae; also can be confused with the sympatric Pheidole specularis. See under P. karolmorae for diagnostic differences from species other than P. karolmorae and P. specularis. Minor worker: side of petiole and postpetiole strongly foveolate versus weakly foveolate (specularis); propodeal spines relatively short, PSLI 14, versus longer, PSLI 15-19 (specularis); postpetiole in dorsal view oval versus more trapezoidal (specularis); dorsal face of hind tibia with three or more long erect setae that are longer than maximum width of tibia and differentiated from underlying shorter subdecumbent pubescence versus with short appressed pubescence only, lacking long erect setae (karolmorae). Major worker: vertex lobes uniformly foveolate versus with reticulate rugulae overlying foveolate sculpture (karolmorae) or less dense and less uniform foveolation (specularis); head relatively rectangular and weakly impressed posteriorly versus more cordate, with more convex sides and more excavate posterior margin (karolmorae); postpetiole in dorsal view relatively trapezoidal versus more transverse, with well-developed conules (specularis); tibial pilosity difference from karolmorae as in minor worker.

Type Material

Holotype major worker. Costa Rica, Heredia: 16km SSW Pto. Viejo, 10.31750°N 84.04889°W, ±500m, 500m, 20 Apr 2007 (Marcos M and Deimer A#AMI-3-W-136-06) Instituto Nacional de Biodiversidad, unique specimen identifier CASENT0609023.

Paratypes: major and minor workers. Same data as holotype; same locality as holotype but 18 Oct 2005 (Marcos M, Gilberth H, and Felix C#AMI-3-W-053-03), 11 Jul 2006 (Gilbert H and Johanna H#AMI-3-W- 085-05), 16 Oct 2006 (Marcos M and Deimer A#AMI-3-W-099-01 and AMI-3-W-099-08), 6 Feb 2007 (Marcos M and Deimer A#AMI-3-W-120-04); Costa Rica, Heredia: 11km SE La Virgen, 10.33333°N 84.06667°W, ±2000m, 500m, 15 Mar 2003 (ALAS#05/WF/03/39); Costa Rica, Heredia: Cantarrana, 11km ESE La Virgen, 10.34528°N 84.05778°W, ±500m, 300m, 21 Mar 2006 (Marcos M, Gilberth H, Felix C#AMI- 4-W-068-03); Costa Rica, Heredia: La Selva, 8km SW Pto. Viejo, 10.40000°N 84.05000°W, ±2000m, 150m, 17 Jul 1986 (J. Longino#JTL1391-s) The Natural History Museum, California Academy of Sciences, EAPZ, ECOSCE, Field Museum of Natural History, Instituto Nacional de Biodiversidad, John T. Longino Collection, Los Angeles County Museum of Natural History, Museum of Comparative Zoology, Musee d'Histoire Naturelle Genève, Instituto de Zoologia Agricola, Museu de Zoologia da Universidade de Sao Paulo, MEL, University of California, Davis, ICN, National Museum of Natural History.


The name is in reference to the similarity to P. karolmorae, but with long setae on the hind tibia.


  • Longino, J.T. 2009. Additions to the taxonomy of New World Pheidole. Zootaxa 2181: 1-90. PDF