Pheidole caltrop Wilson 2003

Formicidae, Hymenoptera, Insecta, Arthropoda, Animalia

worker face view

worker lateral view

major face view

major lateral view

Oblique view of minor worker, showing humeral tubercles: large file, small file.


Minor worker: head length 0.57mm, head width 0.50mm, scape length 0.50mm, Webers length 0.71mm (n=1). Head rounded behind, with small median excavation; mesonotal suture absent; promesonotum evenly arched in profile; humeri produced as triangular tubercles; propodeal spines long, spiniform; face punctatorugose marginally, smooth and shining medially; mesosoma uniformly foveolate; first gastral tergum smooth and shining; dorsal pilosity sparse, short, stiff; mesosomal setae microscopically branched at apex; color orange.

Major worker: head length 0.93mm, head width 0.89mm, scape length 0.49mm (n=1). Clypeus with median keel; face punctatorugose throughout, rugae reticulate laterally and posteriorly, longitudinal and subparallel medially, between frontal carinae; hypostomal margin straight, with very small, nubbin-like median tooth and pointed lateral teeth about one half to two thirds distance from midline to recessed teeth flanking mandible bases (Figure); dorsal pilosity abundant; head with abundant erect setae projecting from sides of head in face view.

The type specimens are from Barro Colorado Island, Panama.


Costa Rica, Panama. Costa Rica: Atlantic lowlands.

Natural History

Arboreal in lowland wet forest; nesting in dead branches.

Selected Records

La Selva: multiple canopy fogging and Malaise trap samples.

La Selva: mature wet forest; recent treefall; small Stryphnodendron and some other tree; nesting in dead branches and twigs.

La Selva: mature wet forest; in recent treefall.

Page authors:

John T. Longino, The Evergreen State College, Olympia WA 98505 USA.

Stefan Cover, Museum of Comparative Zoology, Harvard University, Cambridge MA 02138 USA.

Last modified: 2 September 2003.

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