Editing Apicomplexa (section)

===Perkins (2000)===
[[File:Apicomplexa tree..png|thumb|right|300px]]

Perkins et al. proposed the following scheme.<ref name=Perkins2000>{{cite book |vauthors=Perkins FO, Barta JR, Clopton RE, Peirce MA, Upton SJ |chapter=Phylum Apicomplexa |veditors=Lee JJ, Leedale GF, Bradbury P |title=An Illustrated guide to the Protozoa : organisms traditionally referred to as protozoa, or newly discovered groups |publisher=Society of Protozoologists |edition=2nd |year=2000 |oclc=704052757 |isbn=978-1891276224  |pages=190–369 |volume=1}}</ref> It is outdated as the [[Perkinsidae]] have since been recognised as a sister group to the dinoflagellates rather that the Apicomplexia:
 
* Class [[Aconoidasida]]
*: ''Conoid present only in the [[ookinete]] of some species''
::*Order [[Haemospororida]]
:::''Macrogamete and microgamete develop separately. Syzygy does not occur. Ookinete has a conoid. Sporozoites have three walls. Heteroxenous: alternates between vertebrate host (in which merogony occurs) and invertebrate host (in which sporogony occurs). Usually blood parasites, transmitted by blood-sucking insects.''
::*Order [[Piroplasmorida]]
* Class [[Conoidasida]]
** Subclass [[Gregarinasina]]
*** Order [[Archigregarinorida]]
*** Order [[Eugregarinorida]]
**** Suborder [[Adeleorina]]
**** Suborder [[Eimeriorina]]
*** Order [[Neogregarinorida]]
** Subclass [[Coccidiasina]]
*** Order [[Agamococcidiorida]]
*** Order [[Eucoccidiorida]]
*** Order [[Ixorheorida]]
*** Order [[Protococcidiorida]]
* Class [[Perkinsasida]]
::*Order [[Perkinsorida]]
:::*Family [[Perkinsidae]]

The name Protospiromonadida has been proposed for the common ancestor of the Gregarinomorpha and Coccidiomorpha.<ref name=Krylov1992>{{cite journal |author=Krylov MV |title=[The origin of heteroxeny in Sporozoa] |language=ru |journal=Parazitologiia |volume=26 |issue=5 |pages=361–368 |year=1992 |pmid=1297964 }}</ref>

Another group of organisms that belong in this taxon are the corallicolids.<ref name=Kwong2019>{{cite journal | last1 = Kwong | first1 = WK | last2 = Del Campo | first2 = J | last3 = Mathur | first3 = V | last4 = Vermeij | first4 = MJA | last5 = Keeling | first5 = PJ | year = 2019 | title = A widespread coral-infecting apicomplexan with chlorophyll biosynthesis genes | journal = Nature | volume = 568 | issue = 7750| pages = 103–107 | doi = 10.1038/s41586-019-1072-z | pmid = 30944491 | bibcode = 2019Natur.568..103K | s2cid = 92996418 }}</ref> These are found in coral reef gastric cavities. Their relationship to the others in this phylum has yet to be established.

Another genus has been identified - ''[[Nephromyces]]'' - which appears to be a sister taxon to the Hematozoa.<ref name=Muñoz-Gómez2019>Muñoz-Gómez SA, Durnin K, Eme L, Paight C, Lane CE, Saffo MB, Slamovits CH (2019) ''Nephromyces'' represents a diverse and novel lineage of the Apicomplexa that has retained apicoplasts. Genome Biol Evol</ref> This genus is found in the renal sac of molgulid ascidian [[tunicate]]s.