- Extinct in the wild (EW): 0 species
- Critically endangered (CR): 4 species
- Endangered (EN): 1 species
- Vulnerable (VU): 1 species
- Near threatened (NT): 0 species
- Least concern (LC): 0 species
- Data deficient (DD): 9 species
Species in Chromista (IUCN, 2021-2)
- 15 extant species have been evaluated
- 6 of those are fully assessed[a]
- 0 are not threatened at present[b]
- 6 to 15 are threatened[c]
- 0 to 4 are extinct or extinct in the wild:
- 0 extinct (EX) species
- 0 extinct in the wild (EW)
- 4 possibly extinct [CR(PE)]
- 0 possibly extinct in the wild [CR(PEW)]
- ^ excludes data deficient evaluations.
- ^ NT and LC.
- ^ Threatened comprises CR, EN and VU. Upper estimate additionally includes DD.
As of September 2021[update], the International Union for Conservation of Nature (IUCN) has evaluated the conservation status of 15 species within Chromista.[1] 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.
As of 2005[update] the New Zealand Threat Classification System has evaluated 38 species of macroalgae as Threatened and 23 as Data Deficient.[2] Some of these species are only of concern nationally.[2]
- ^ "IUCN Red List version 2021-2". The IUCN Red List of Threatened Species. International Union for Conservation of Nature and Natural Resources (IUCN). ISSN 2307-8235. Archived from the original on 8 September 2021. Retrieved 8 September 2019.
- ^ a b Hitchmough, Rod; Bull, Leigh; Cromarty, Pam (January 2007). New Zealand Threat Classification System lists 2005 (PDF). Wellington, NZ: Science & Technical Publishing Department of Conservation. ISBN 978-0478141283. Archived (PDF) from the original on 31 January 2018. Retrieved 2 February 2018.