Williams, D.J., & Pellizzari, G. 1997 Two species of mealybugs (Homoptera Pseudococcidae) on the roots of Aloaceae in greenhouses in England and Italy.. Bollettino di Zoologia Agraria e di Bachicoltura (Milano) Ser. II, 29: 157-166.

Notes: Ripersia speciosa is now described as Trochiscococcus speciosus, new gen., new sp.; Rhizoecus aloes, new sp. also described.