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 Coccolithophyceae Conococcolithus Corannulus Craspedolithus Crassapontosphaera Cyclolithella Discoasteridae Ellipsodiscoaster Helicosphaera Heliorthus Koczyia Leptodiscus Lithostromationaceae Nannocorbis Orthozygus Pyrocyclus Reticulofenestra Rhabdolithina Sphenaster Striatococcolithus Syracosphaera Umbilicosphaera Vermiculithina Wiseorhabdus
Ecology: passively mobile planktonic "photoautotroph"