Cox, J.M. 1984 Relationships of the Phenacoleachiidae (Homoptera: Coccoidea).. Proceedings of the 10th International Symposium of Central European Entomofaunistics, Budapest, 15-20 August 1983 : 339-341.

Notes: Author concludes that Phenacoleachiidae & Pseudococcidae may be sister groups & their relationships with the remaining groups of scale insects will only be determined when the homologies of the characters are better understood; mentions two coccoid spp.