Kingdom Protoctista Hogg, 1860 Phylum Prymnesiophyta Hibberd (1976), nom. inval. - haptophytes see Phylum Prymnesiophyta Hibberd ex Doweld (2001) Class Prymnesiophyceae D.J. Hibberd (1976) see Class Coccolithophyceae Rothm. (1951)