Division Haptophyta Hibberd Class Prymnesiophyceae D.J. Hibberd (1976) see Class Coccolithophyceae Rothm. (1951) Subclass Prymnesiophycidae (D.J. Hibberd) Cavalier-Sm. (1986) see Class Prymnesiophyceae D.J. Hibberd (1976) "Nannoliths" Order †Discoasterales Hay (1977) Family †Heliolithaceae Hay & Mohler (1967)