Existen catro [[filo]]s que, malia seren moi desemellantes en forma, sábese que están emparentados debido a varias similaridades xenéticas e ultraestruturais. Son:
There are four [[phylum|phyla]], which are very divergent in form, but are now known to be close relatives based on various ultrastructural and genetic similarities:
*[[Ciliado]]s. Protozoos moi comúns con moitos [[cilio]]s dispostos en ringleiras.
*[[Ciliate]]s - very common protozoa with many short [[cilium|cilia]] arranged in rows
*[[Dinoflagellata]]. Son [[flaxelado]]s principalmente mariños moitos deles con [[cloroplasto]]s.
*[[Dinoflagellate]]s - mostly marine [[flagellate]]s many of which have [[chloroplast]]s
TheO genusxénero ''[[Perkinsus]]'' maypode belongpertencer toa anotheroutro clade[[clado]], -os [[Perkinsozoa]], - based ondebido a numbervarias ofcaracterísticas molecular biological findingsmoleculares. <ref name=Zhang2011>Zhang H, Campbell DA, Sturm NR, Dungan CF, Lin S (2011) Spliced leader RNAs, mitochondrial gene frameshifts and multi-protein phylogeny expand support for the genus ''Perkinsus'' as a unique group of Alveolates. PLoS One. 2011;6(5):e19933</ref>