Pheidole arachnion Wilson 2003

Suggested synonym:
= Pheidole iracunda Wilson 2003

Formicidae, Hymenoptera, Insecta, Arthropoda, Animalia

worker face view

worker lateral view

major face view

major lateral view


Minor worker: head length 0.62mm, head width 0.60mm, scape length 0.69mm, Webers length 0.86mm (n=1). Head broadly rounded behind; promesonotum evenly arched, mesonotal suture very weakly impressed or absent; propodeal spines absent, juncture of propodeal dorsum and declivity marked by prominent transverse carina; face, mesosoma, and gaster largely smooth and shining, with transverse carinae on posterodorsal promesonotum, propodeal dorsum; dorsal pilosity abundant, long, flexuous; color red brown.

Major worker: head length 1.53mm, head width 1.46mm, scape length 0.65mm (n=1). Face punctatorugose throughout; clypeus smooth and shining with broad, low, median prominence; hypostomal margin with low, rounded medial lobe, pair of subtriangular teeth located about half way between midline and recessed teeth flanking mandibles; dorsal pilosity abundant; head with abundant setae projecting from sides of head in face view.


Costa Rica: Atlantic lowlands.

Natural History

Inhabits lowland rainforest; nests in dead wood on ground.

Selected Records

Winkler samples from Hitoy Cerere Biological Reserve, Turrialba, La Selva.

La Selva: nest in dead wood on the ground (Chris Thompson study).

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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