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diagnosis An extreme workerless social parasite of Pheidole nitidulaHNS, with adaptations that make it unique within the genus. Queen: with 9- to 11-segmented antennae and minute, falcate toothless mandibles that taper to needle-sharp points. Male: pupiform, with mandibles vestigial or absent.
measurements (mm) Syntype queen: HW 0.40, HL 0.42, SL 0.72, EL 0.12, PW 0.58.
Color Queen: yellowish brown.
Range Known only from the type locality.
Biology P. acutidensHNS is a permanent workerless parasite of Pheidole nitidulaHNS. The discoverer of this remarkable species, Carlos Bruch (1931), has provided extensive notes on its anatomy, ecology, behavior, and life cycle.
Figure Queen. ARGENTINA: La Plata, Buenos Aires (Carlos Bruch). Type locality: Alta Gracia (La Granja). Sierra de Cordoba, Argentina. Scale bar = 1 mm.
Type specimens: syntype of Pheidole acutidens: casent0913258