Editing Actinophryid (section)

==Taxonomy==
Originally placed in [[Heliozoa]] ([[Sarcodina]]), the actinophryids are now understood to be part of the stramenopiles. They are unrelated to centrohelid and desmothoracid heliozoa with which they had been previously classified.

There are several genera included within this classification.<ref name="Heliozoa III"/>  ''Actinophrys'' are smaller and have a single, central nucleus.<ref name="Kinoshita2001" /> Most have a cell body 40–50 [[μm|micrometer]] in diameter with axopods around 100 μm in length, though this varies significantly. ''Actinosphaerium'' are several times larger, from 200 to 1000 μm in diameter, with many nuclei<ref name="Kinoshita2001" /> and are found exclusively in fresh water.<ref>{{Cite web|url=https://www.arcella.nl/actinosphaerium-eichhornii/|title=Actinosphaerium eichhornii|date=2019-02-28|website=Microworld|language=en|access-date=2020-01-29}}</ref> A third genus, ''Camptonema'', has a debated status. It has been observed once and was treated as a junior subjective synonym of ''Actinosphaerium'' by Mikrjukov & Patterson in 2001,<ref name="Heliozoa III"/> but as a valid genus by Cavalier-Smith & Scoble (2013).<ref name="CavSmith2013" /> ''Heliorapha'' is a further debated taxon, it being a new generic vehicle for the species ''azurina'' that was initially assigned to the genus ''Ciliophrys''.<ref name="CavSmith2013" />