Pheidole gymnoceras , Longino, J. T., 2009
treatment provided by
Holotype major worker. Costa Rica, Heredia: 10km NE Vara Blanca, 10.23333°N 84.08333°W, ±2000m, 1500m, 9 Feb 2005 (J. Longino#5412) [ INBC, unique specimen identifier INB0003659251].
Paratypes: major and minor workers. Same data as holotype [ BMNH, CAS, EAPZ, ECOSCE, FMNH, INBC, JTLC, LACM, MCZ, MHNG, MIZA, MZSP, MEL, UCD, UNAM, ICN, USNM].
With the morphometric profile of P. aciculata HNS , minor workers very similar to the sympatric P. indagatrix HNS . Minor worker: scape with all setae shorter than maximum width of scape versus with many erect setae longer than maximum width of scape ( aciculata HNS , indagatrix HNS ); hind femur with subdecumbent setae on dorsal surface versus with suberect setae on dorsal surface ( aciculata HNS , indagatrix HNS ). Major worker: relative to aciculata HNS , inner hypostomal teeth more widely spaced; mesosoma less shiny; scapes with shorter setae; hind femur with dorsal setae subdecumbent versus suberect; sides of head with shorter, less erect setae; posterior margin of head more cordate.
Description of minor worker
Measurements (paratype): HL 0.83, HW 0.63, HLA 0.30, SL 1.17, EL 0.20, ML 1.11, PSL 0.10, PMG 0.04, SPL 0.04, PTW 0.13, PPW 0.19, CI 76, SI 185, PSLI 12, PMGI 5, SPLI 5, PPI 150.
Measurements (n=9): HL 0.78-0.85, HW 0.59-0.65, SL 1.10-1.17, CI 74-77, SI 176-190.
Mandible and clypeus smooth and shining; face with a few concentric rugae around antennal insertion, small patch of foveolate sculpture between frontral carina and compound eye; rest of face smooth and shining; margin of vertex rounded; occipital carina narrow, visible in full face view; scape with dense suberect setae but all shorter than maximum width of scape; promesonotal groove present, conspicuous; propodeal spines present; pronotum with patches of foveolate sculpture on humerus and anterior border, smooth and shining elsewhere; katepisternum and lateral and dorsal faces of propodeum foveolate overlain with inconspicuous rugulae; abundant setae on promesonotal dorsum; dorsal (outer) margin of hind tibia with abundant suberect setae, some longer than maximum width of tibia; dorsal face of hind tibia with setae appressed to subdecumbent; first gastral tergum smooth and shining; gastral dorsum with abundant suberect setae; color red brown.
Description of major worker
Measurements (holotype): HL 1.42, HW 1.39, HLA 0.40, SL 1.07, EL 0.24, ML 1.43, PSL 0.08, PMG 0.04, SPL 0.06, PTW 0.26, PPW 0.34, IHT 0.50, OHT 0.57, CI 98, SI 77, PSLI 6, PMGI 3, SPLI 4, PPI 130, HTI 88.
Mandible smooth and shiny; clypeus smooth and shining, flat, with distinct anterior notch; short longitudinal rugae between mandibular insertion and compound eye, a few concentric rugae around antennal insertion, grading to reticulate rugae between frontal carina and compound eye, rest of face smooth and shining; head with abundant short subdecumbent setae projecting from sides of head in face view; scape smooth and shining, terete at base, with abundant short subdecumbent setae, none longer than maximum width of scape; hypostomal margin straight; median tooth absent; inner hypostomal teeth thin and sharp, widely-spaced, much closer to outer hypostomal teeth than to midline; promesonotal groove present; propodeal spines present; pronotum smooth and shining with small irregular patches of faint foveolate sculpture; katepisternum smooth and shining anteriorly, grading to rugose-foveolate posteriorly and on lateral and dorsal faces of propodeum; dorsal (outer) margin of hind tibia with abundant suberect setae, some longer than maximum width of tibia; pilosity abundant on mesosomal dorsum; postpetiole in dorsal view globular; first gastral tergite smooth and shining, with abundant suberect setae; color red brown.
This species inhabits mid-elevation wet forest. During ALAS project sampling of the Barva transect it was found at the 1100m and 1500m sites. At the 1100m site it was most frequently captured in flight intercept traps, suggesting it is an epigaeic forager. At the 1500m site (Finca Murillo) a small queenrite nest was found beneath rotten wood; the workers had a foetid odor.
The name is in reference to the lack of longer erect setae on the scape of the minor worker.
Additional material examined
COSTA RICA: Heredia, 16km SSE La Virgen, 10°16'N, 84°05'W, 1100m (multiple collectors and collections).
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
Mexico, Mexico D.F., Universidad Nacional Autonoma de Mexico
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]
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.