Class
Class Prymnesiophyceae retains non-calcified forms, which may or may not have organic body scales. Like Coccolithophyceae, taxa within this class can also have a coiled haptonema and two equal flagella.
Casper, S.J. von 1972. Observations on the fine structure of the flagellar apparatus in Chrysomonads. I. Uroglena americana Calkins. Archiv für Protistenkunde, 114: 65–82.
Hibberd, D.J. 1976. The ultrastructure and taxonomy of the Chrysophyceae and Prymnesiophyceae (Haptophyceae): a survey with some new observations on the ultrastructure of the Chrysophyceae. Journal of the Linnean Society of London, Botany 72: 55–80.