Laudého, Y., Ormières, R., & Iperti, G. 1969 [Entomophagous insects of Parlatoria blanchardi Targ. in the palmgrove of the Mauritanian Adrar. II. Study of a Coccinellidae parasite, Gregarina katherina Watson.]. Annales de Zoologie - Ecologie Animale 1(4): 395-406.

Notes: [Les entomophages de Parlatoria blanchardi Targ. dans les palmeraies de l'Adrar Mauritanien. II. Étude d'un parasite de "Coccinellidae, Gregarina katherina" Watson.] G. katherina parasitises many species of indigenous Coccinellidae at any stage of their lives year round and thereby threatens control of P. blanchardi by these coccinellids.