Table S1.
Taxon sampling for the phylogeny based on five chloroplast-encoded genes and two chloroplast rDNA sequences
| Species | Class | Division | atpB | psaA | psaB | psbC | rbcL | 16S | 23S |
| Volvox carteri | Chlorophyceae | Chlorophyta | GU084820 | GU084820 | GU084820 | GU084820 | GU084820 | GU084820 | GU084820 |
| Chlamydomonas reinhardtii | Chlorophyceae | Chlorophyta | BK000554 | BK000554 | BK000554 | BK000554 | BK000554 | BK000554 | BK000554 |
| Chlamydomonas eustigma | Chlorophyceae | Chlorophyta | LC229070 | LC229069 | LC229071 | LC229072 | LC229073 | LC229075 | LC229074 |
| Stigeoclonium helveticum | Chlorophyceae | Chlorophyta | DQ630521 | DQ630521 | DQ630521 | DQ630521 | DQ630521 | DQ630521 | DQ630521 |
| Pseudendoclonium akinetum | Ulvophyceae | Chlorophyta | AY835431 | AY835431 | AY835431 | AY835431 | AY835431 | AY835431 | AY835431 |
| Oltmannsiellopsis viridis | Ulvophyceae | Chlorophyta | DQ291132 | DQ291132 | DQ291132 | DQ291132 | DQ291132 | DQ291132 | DQ291132 |
| Chlorella variabilis NC64A | Trebouxiophyceae | Chlorophyta | KJ718922 | KJ718922 | KJ718922 | KJ718922 | KJ718922 | KJ718922 | KJ718922 |
| Chlorella vulgaris | Trebouxiophyceae | Chlorophyta | AB001684 | AB001684 | AB001684 | AB001684 | AB001684 | AB001684 | AB001684 |
| Coccomyxa subellipsoidea C-169 | Trebouxiophyceae | Chlorophyta | HQ693844 | HQ693844 | HQ693844 | HQ693844 | HQ693844 | HQ693844 | HQ693844 |
| Paradoxia multiseta | Trebouxiophyceae | Chlorophyta | KM462879 | KM462879 | KM462879 | KM462879 | KM462879 | KM462879 | KM462879 |
| Nephroselmis olivacea | Prasinophyceae | Chlorophyta | AF137379 | AF137379 | AF137379 | AF137379 | AF137379 | AF137379 | AF137379 |
| Nephroselmis astigmatica | Prasinophyceae | Chlorophyta | KJ746600 | KJ746600 | KJ746600 | KJ746600 | KJ746600 | KJ746600 | KJ746600 |
| Micromonas commoda RCC299 | Prasinophyceae | Chlorophyta | FJ858267 | FJ858267 | FJ858267 | FJ858267 | FJ858267 | FJ858267 | FJ858267 |
| Ostreococcus tauri | Prasinophyceae | Chlorophyta | CR954199 | CR954199 | CR954199 | CR954199 | CR954199 | CR954199 | CR954199 |
| Arabidopsis thaliana | Magnoliopsida | Streptophyta | AP000423 | AP000423 | AP000423 | AP000423 | AP000423 | AP000423 | AP000423 |
| Klebsormidium flaccidum | Charophyceae | Streptophyta | DF238762 | DF238762 | DF238762 | DF238762 | DF238762 | DF238762 | DF238762 |
| Mesostigma viride | Mesostigmatophyceae | Streptophyta | AF166114 | AF166114 | AF166114 | AF166114 | AF166114 | AF166114 | AF166114 |
| Cyanidium caldarium RK1 | Cyanidiophyceae | Rhodophyta | AF022186 | AF022186 | AF022186 | AF022186 | AF022186 | AF022186 | AF022186 |
| Cyanidioschyzon merolae 10D | Cyanidiophyceae | Rhodophyta | AB002583 | AB002583 | AB002583 | AB002583 | AB002583 | AB002583 | AB002583 |
| Galdieria sulphuraria 074W | Cyanidiophyceae | Rhodophyta | KJ700459 | KJ700459 | KJ700459 | KJ700459 | KJ700459 | KJ700459 | KJ700459 |
| Cyanophora paradoxa | Glaucophyceae | Glaucophyta | U30821 | U30821 | U30821 | U30821 | U30821 | U30821 | U30821 |
atpB, beta subunit of ATP synthase; psaA, P700 chlorophyll a-apoprotein A1; psaB, P700 chlorophyll a-apoprotein A2; psbC, photosystem II CP43 apoprotein; rbcL, large subunit of rubisco; 16S, 16S ribosomal RNA; 23S, 23S ribosomal RNA.