Pheidole karolsetosa , Longino, J. T., 2009

Longino, J. T., 2009, Additions to the taxonomy of New World Pheidole (Hymenoptera: Formicidae)., Zootaxa 2181, pp. 1-90: 44-45

publication ID


publication LSID

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scientific name

Pheidole karolsetosa

new species

Pheidole karolsetosa  HNS  new species

Figure 11

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) [ INBC, 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) [ BMNH, CAS, EAPZ, ECOSCE, FMNH, INBC, JTLC, LACM, MCZ, MHNG, MIZA, MZSP, MEL, UCD, ICN, USNM].

Geographic Range

Costa Rica.


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

Description of minor worker

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  HNS  only in the diagnostic characters above.

Description of major worker

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  HNS  only in the diagnostic characters above.


Pheidole karolsetosa  HNS  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.


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


This species is very similar to P. karolmorae  HNS  , differing in characters that are not typically considered sufficient to recognize distinct species. However, the two species are sympatric at the smallest spatial scales and show no overlap in the diagnostic characters.


Costa Rica, Santo Domingo de Heredia, Instituto Nacional de Biodiversidad (INBio)


United Kingdom, London, The Natural History Museum [formerly British Museum (Natural History)]


USA, California, San Francisco, California Academy of Sciences


Honduras, Tegucigalpa, Escuela Agricola Panamericana


USA, Illinois, Chicago, Field Museum of Natural History (also used by Finnish Museum of Natural History)


John T. Longino


USA, California, Los Angeles, Los Angeles County Museum of Natural History


USA, Massachusetts, Cambridge, Harvard University, Museum of Comparative Zoology


Switzerland, Geneva, Museum d'Histoire Naturelle


Venezuela, Maracay, Museuo del Instituto de Zoologia Agricola


Brazil, Sao Paulo, Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo


USA, California, Davis, University of California, R.M. Bohart Museum of Entomology


Colombia, Bogota, Universidad Nacional de Colombia, Insituto de Ciencias Naturales de la Universidad Nacional


USA, Washington D.C., National Museum of Natural History, [formerly, United States National Museum]