Phylum: Chlorophyta (Green Algae)
The taxonomy presented here follows AlgaeBase as at early August 2026. Doubtless many new species await discovery and formal description, and this may necessitate the erection of novel higher taxonomic ranks.
Subphylum: Chlorophytina
Class: Chlorophyceae
Order: Volvocales (=Chlamydomonadales)
Family: Volvocaceae
| Scientific Name & Authority | Common Name/s | Distribution (Habitat) | Status (Last Record) | Taxon Profile |
| Volvox perglobator J.H.Powers (1908) | - | Arizona, Nebraska & Massachusetts, USA | Rediscovered | Access |
Families: Actinochloridaceae, Asteromonadaceae, Carteriaceae, Characiochloridaceae, Characiosiphonaceae, Chlamydomonadaceae, Chlorangiellaceae, Chlorochytriaceae, Chlorococcaceae, Chlorosarcinaceae, Dunaliellaceae, Goniaceae, Haematococcaceae, Hypnomonadaceae, Palmellaceae, Palmellopsidaceae, Phacotaceae, Pleurastraceae, Protosiphonaceae, Sphaerocystidaceae, Sphaerodictyaceae, Spondylomoraceae, Tetrabaenaceae, Tetrasporaceae, Wislouchiaceae
—No subordinate taxa
Orders: Chaetopeltidales, Chaetophorales, Oedogoniales, Sphaeropleales
—No subordinate taxa
Class: Ulvophyceae
Order: Cladophorales
Family: Anadyomenaceae
| Scientific Name & Authority | Common Name/s | Distribution (Habitat) | Status (Last Record) | Taxon Profile |
| Anadyomene menziesii (J.E.Gray) J.Agardh (1887) | - | Gulf of Mexico | Rediscovered | Access |
Family: Cladophoraceae
| Scientific Name & Authority | Common Name/s | Distribution (Habitat) | Status (Last Record) | Taxon Profile |
| Chaetomorpha stricta Schiffner (1938) | - | Venetian Lagoon, Italy | Rediscovered | Access |
Families: Boodleaceae, Okellyaceae, Pithophoraceae, Pseudocladophoraceae, Siphonocladaceae, Valoniaceae
—No subordinate taxa
Order: Trentepohliales
Family: Trentepohliaceae
| Scientific Name & Authority | Common Name/s | Distribution (Habitat) | Status (Last Record) | Taxon Profile |
| Trentepohlia afra (Massalongo) A.B.Cribb. (1970) | - | Table Mountain, South Africa | Rediscovered | Access |
| Trentepohlia chinensis (Harvey) Hariot (1889) | - | China (Hong Kong), Madagascar, South Africa, Tanzania & Zanzibar | Rediscovered | Access |
Orders: Bryopsidales, Chlorocystidales, Dasycladales, Ignatiales, Oltmannsiellopsidales, Scotinosphaerales, Sykidiales, Ulotrichales, Ulvales
—No subordinate taxa
Classes: Chlorodendrophyceae, Pedinophyceae, Trebouxiophyceae
—No subordinate taxa
Subphylum: Prasinophytina
Classes: Mamiellophyceae, Nephroselmidophyceae, Pyramimonadophyceae
—No subordinate taxa
Subphylum: incertae sedis
Classes: Chloropicophyceae, Picocystophyceae, Pseudoscourfieldiophyceae
—No subordinate taxa
Statistics
| Conservation status | Number of taxa (in percentage) |
| Extinct | 0 |
| Missing | 0 |
| Extinct in the Wild | 0 |
| Possibly Extinct in the Wild | 0 |
| Globally Rediscovered | 5 (100%) |
| Rediscovered in the Wild | 0 |
| Reintroduced | 0 |
| Uncertain status | 0 |
| Hypothetical | 0 |
| Total | 5 (100%) |
| Erroneously listed | 0 |
| Invalid | 0 |
| Grand total | 5 (100%) |