Phylum Haptophyta Hibberd ex Cavalier-Smith 1986 (haptophyte alga)
Parent taxon: Chromalveolata according to S. M. Adl et al. 2005
See also Young and Bown 1997
Sister taxa: Alveolata, Cryptophycae
Subtaxa: Aspidorhabdus Camuralithus Coccolithophyceae Conococcolithus Corannulus Craspedolithus Crassapontosphaera Crassidiscus Cricosphaera Cyclolithella Cycloperfolithus Discoasteridae Duplexipodorhabdus Ellipsodiscoaster Helicosphaera Heliorthus Koczyia Leptodiscus Lithostromationaceae Nannocorbis Orthozygus Pervilithus Phanulithus Pyrocyclus Reticulofenestra Rhabdolithina Sphenaster Striatococcolithus Syracosphaera Umbilicosphaera Vermiculithina Wiseorhabdus
Ecology: passively mobile planktonic "photoautotroph"