Key to New World Pheidole Social Parasites

This key is based on:

This is a queen based key.

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 * Pheidole
 * "New World Pheidole" Wilson 2003

1

 * Queen antenna 10-segmented, with a 1-segmented club (parasite of P. nitidula of Argentina; placed provisionally in fallax group) . . . . . Pheidole argentina


 * Antenna 9- to 12-segmented, with a 3-segmented club . . . . . 2

2
return to couplet #1
 * Mandibles of queen reduced to tiny appendages, which are toothless, tapered to a blunt point at the end and only 0.06-0.07 mm long; male brachypterous and pupiform (parasite of P. nitidula of Argentina; placed provisionally in fallax group) . . . . . Pheidole acutidens


 * Mandibles of queen normal in aspect . . . . . 3

3
return to couplet #2
 * Sides of postpetiole expanded into hornlike extensions that make the postpetiole as a whole 3X broader than the petiole when viewed from above (parasite of P. ceres in Colorado; placed in pilifera group) . . . . . Pheidole elecebra


 * Postpetiole normal in aspect, only 2X broader than petiole or less . . . . . 4

4
return to couplet #3
 * Occipital corners of queen's head angulate (parasite of P. pilifera in Colorado, Nebraska, and Nevada; placed provisionally in pilifera group); small numbers of parasite minors and majors sometimes appear among host workers . . . . . Pheidole inquilina


 * Occipital corners of queen's head smoothly rounded . . . . . 5

5
return to couplet #4
 * Petiolar node in side view angulate at summit, its sides foveolate, crossed by longitudinal carinulae, and opaque (parasite of P. obscurior in Argentina; placed in fallax group) . . . . . Pheidole kusnezovi 


 * Petiolar node in side view angulate at summit, its sides smooth and shining (likely parasite of P. minutula in Guyana, either temporary or permanent, but status uncertain; placed inflavens group) . . . . . Pheidole microgyna