Key to adult female Prionococcus species

1. Marginal setae stoutly setose; stigmatic setae spinose, lanceolate. Marginal setae absent along margins of anal cleft .............................................................................................................................. P. fontanai sp.n.

- Marginal setae mainly spinose lanceolate and/or bulbous. Marginal setae present along margins of anal cleft .............................................................................................................................................................. 2

2. Body round to slightly oval; marginal setae mainly spinose lanceolate .......................................... P. agave

- Body oval, but often showing asymmetry; margin with both spinose lanceolate and setose setae............... ................................................................................................................................................ P. americanus