, 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.
the New Zealand Threat Classification System has evaluated 38 species of macroalgae as Threatened and 23 as Data Deficient. Some of these species are only of concern nationally.
IUCN evaluations
Critically Endangered (possibly extinct) Bifurcaria galapagensis - Galapagos stringweed Desmarestia tropica - tropical acidweed Dictyota galapagensis Spatoglossum schmittii
Endangered
Sargassum setifolium - string sargassum
Vulnerable
Eisenia galapagensis - Galapagos kelp
Data Deficient
All are brown algae (Phaeophyceae): Of the Dictyotaceae, Dictyopteris diaphana Dictyota major Padina concrescens Spatoglossum ecuadoreanum Of the Chordariaceae, Zosterocarpus abyssicola Of the Sargassaceae, Sargassum albemarlense Sargassum galapagense Sargassum templetonii Of the Sporochnaceae, Sporochnus rostratus
NZTCS evaluations
Nationally Critical
Dione arcuata - One Location
Range Restricted
Caulerpa racemosa - Secure Overseas
Caulerpa sertulariodes - Secure Overseas, One Location
Caulerpa webbiana - Secure Overseas, One Location
Chlidophyllon kaspar - One Location
Chordariopsis capensis - Data Poor, Secure Overseas
Chrysymenia? polydactyla - Data Poor, One Location
Codium geppiorum - Secure Overseas, One Location
Curdiea balthazar - One Location
Dichotomaria marginata - Secure Overseas, One Location
Durvillaea sp. Antipodes WELT A17080 - One Location
Durvillaea chathamensis - One Location
Galaxaura cohaerens - One Location
Galaxaura filamentosa - One Location
Galaxaura rugosa - One Location
Ganonema farinosa - One Location
Gelidium allanii - Threatened Overseas
“Gelidium” ceramoides
Gelidium longipes - One Location
Gigartina sp. Bounty Is. - One Location
Gigartina dilatata -
Gigartina grandifida - One Location
Gigartina sp. Three Kings - One Location
Landsburgia ilicifolia - Data Poor, One Location
Landsburgia myricifolia - One Location
Lessonia adamsiae - One Location
Lessonia brevifolia -
Lessonia tholiformis - One Location
Marginariella parsonsii
Palmophyllum umbracola
Perisporochnus regalis - One Location
Predaea sp. - One Location
Psilosiphon scoparium - Threatened Overseas
Pterocladia lindaueri - One Location
Pyrophyllon cameronii - One Location
Sargassum johnsonii - One Location
Sonderopelta coriacea - Secure Overseas, One Location
Tricleocarpa cylindrica - Secure Overseas, One Location
Data Deficient
Acrochaete endostraca
Acrochaetium leptonemioides - One Location
Acrochaetium neozeelandicum - One Location
Bangia spp. Caulerpa fastigiata Cephalocystis furcellata Champiocolax sp. Codium perriniae Codium platyclados - Threatened? Overseas Cutleria mollis Entocladia spp. Epicladia testarum Erythrotrichia bangioides - One Location Erythrotrichia hunterae - One Location Giraudyopsis stellifera - Secure Overseas Nemacystus novae-zelandiae Ochlochaete hystrix Ovillaria catenata Porphyra spp. Porphyridium purpuream - Secure Overseas Pseudobryopsis planktonica - One Location Sebdenia lindaueri - One Location Syncoryne reinkei