Rotundo, G., & Tremblay, E. 1980 Serological studies on five species of Pseudococcidae (Homoptera).. Systematic Entomology 5: 431-435.

Notes: Planococcus citri. P. ficus, Pseudococcus obscurus, Calceolariae and P. longispinus; presents dendogram for the phylogenetic relations among the five species.