As of July 2016, the International Union for Conservation of Nature (IUCN) has evaluated the conservation status of 15 species within Chromista. The IUCN has not evaluated any protist species other than those in Chromista. No Chromista subspecies or subpopulations have been evaluated.
No evaluated Chromista species are confirmed to be extinct, but four are tagged as possibly extinct.
This is a complete list of Chromista evaluated by the IUCN.
References
List of Chromista by conservation status Wikipedia(Text) CC BY-SA