| Name | Author | Source | Citation | Year |
|---|
| Arthrodesmus incus var. convergens | (Ehrenberg ex Ralfs) De Toni | Sylloge algarum ... Vol. I. Chlorophyceae: | 1057 | 1889 |
| Cosmarium perforatum var. rotundatum ('rotundata') | Skuja | Acta Hort. Bot. Univ. Latv. | 3: 164, pl. IV: figs. 4, 5 | 1928 |
| Cosmarium tutum | I. Shyndanovina | Phytotaxa | 461: 244 | 2020 |
| Fragilaria goeyersiana | B. Van de Vijver & L. Ector | Phytotaxa | 468: 91, figs. 46-75 | 2020 |
| Fragilaria vandevondeliana | B. Van de Vijver & L. Ector | Phytotaxa | 468: 93, figs. 76-111 | 2020 |
| Gigartina skottsbergii | Setchell & N.L. Gardner | Proc. Natl. Acad. Sci. | 22: 472 | 1936 |
| Mallomonas collucata | E.S. Gusev & M.S. Kulikovskiy | Phytotaxa | 468: 125, figs. 16-22 | 2020 |
| Mallomonas punctostriata | E.S. Gusev & M.S. Kulikovskiy | Phytotaxa | 468: 123, figs. 2-15 | 2020 |
| Microcystis roeseana | (De Bary) Elenkin | Monogr. Alg. Cyanophyc., Pars Spec. | 1: | 1938 |
| Placoneis mologaensis | V.S. Vishnyakov | Phytotaxa | 464: 219, figs. 1-26 | 2020 |
| Pseudostaurosira caballeroae | V.H. Salinas, D. Mora, R. Jahn & N. Abarca | Phytotaxa | 464: 199, figs. 36-49 | 2020 |
| Pseudostaurosira carmonae | V.H. Salinas, D. Mora, R. Jahn & N. Abarca | Phytotaxa | 464: 196, figs. 2-17 | 2020 |
| Pseudostaurosira iztaccihuatlii | V.H. Salinas & D. Mora in Salinas et al. | Phytotaxa | 464: 196, figs. 18-35 | 2020 |
| SARCOPELTIS | M.H. Hommersand in Hughey et al. | Phytotaxa | 468: 77 | 2020 |
| Sarcopeltis antarctica | M.H. Hommersand, J.R. Hughey, J.L. Leister & P.W. Gabrielson in Hughey et al. | Phytotaxa | 468: 80, fig. 3 | 2020 |
| Sarcopeltis skottsbergii | (Setchell & N.L. Gardner) M.H. Hommersand, J.R. Hughey, J.L. Leister & P.W. Gabrielson in Hughey et al. | Phytotaxa | 468: 79 | 2020 |
| Sargassum xochitliae ('xochitlae') | D. González-Nieto, M.C. Oliveira & L.E. Mateo-Cid in González-Nieto et al. | Phytotaxa | 461: 259, fig. 3 | 2020 |