1971 [Deflandriaceae Black 1968] Family †Tubodiscaceae Bown & Rutledge 1997 Order Coccolithales Schwartz 1932 [Coccolithophorales] Family Reticulosphaeraceae Cavalier-Smith 1996 [Reticulosphaeridae] Family Calcidiscaceae Young & Bown 1997 Family Coccolithaceae Poche 1913 emend. Young & Bown, 1997 [Coccolithophoraceae] Family Pleurochrysidaceae Fresnel & Billard 1991 Family Hymenomonadaceae Senn 1900 [Ochrosphaeraceae Schussnig 1930] References External links Algal taxonomy Bikont phyla