Pheidole arachnion Wilson, 2003a: 656, figs. (s.w.) COSTA RICA. Neotropic.

Primary type information: Primary type material: holotype major worker. Primary type locality: Costa Rica: Cartago, Rio Reventazon, 3-5 km. E Turrialba (W.L. Brown). Primary type depository: MCZC. Secondary type information: Secondary type material: 1 paratype minor worker. Secondary type locality: same as for holotype. Secondary type depository: MCZC. Type notes: Details of paratype castes and their numbers are not given.