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List of eukaryotic species that belong to picoplankton, meaning one of their cell dimensions is smaller than 3 μm.
- Stichococcus cylindricus Butcher, 3 – 4.5 μm, brackish
- Marsupiomonas pelliculata Jones et al., 3 – 3 μm, brackish-marine
- Resultor micron Moestrup, 1.5 – 2.5 μm, marine
- Bathycoccus prasinos Eikrem et Throndsen, 1.5 – 2.5 μm, marine
- Crustomastix stigmatica Zingone, 3 – 5 μm, marine
- Dolichomastix lepidota Manton, 2.5 – 2.5 μm, marine
- Dolichomastix eurylepidea Manton, 3 μm, marine
- Dolichomastix tenuilepis Throndsen et Zingone, 3 – 4.5 μm, marine
- Mantoniella squamata Desikachary, 3 – 5 μm, marine
- Micromonas pusilla Manton et Parke, 1 – 3 μm, marine
- Ostreococcus tauri Courties et Chrétiennot-Dinet, 0.8 – 1.1 μm, marine
- Picocystis salinarum Lewin, 2 – 3 μm, hypersaline
- Prasinococcus capsulatus Miyashita et Chihara, 3 – 5.5 μm, marine
- Prasinoderma coloniale Hasegawa et Chihara, 2.5 – 5.5 μm, marine
- Pseudoscourfieldia marina Manton, 3 – 3.5 μm, marine
- Pycnococcus provasolii Guillard, 1.5 – 4 μm, marine
- Pyramimonas virginica Pennick, 2.7 – 3.5 μm, marine
- Chlorella nana Andreoli et al., 1.5 – 3 μm, marine
- Picochlorum oklahomensis Henley et al., 2 – 2 μm, hypersaline
- Picochlorum atomus Henley et al., 2 – 3 μm, brackish
- Picochlorum eukaryotum Henley et al., 3 – 3 μm, marine
- Picochlorum maculatus Henley et al., 3 – 3 μm, brackish
- Hillea marina Butcher, 1.5 – 2.5 μm, marine
- Chrysochromulina tenuisquama Estep et al., 2 – 5 μm, marine
- Chrysochromulina minor Parke et Manton, 2.5 – 7.5 μm, marine
- Chrysochromulina apheles Moestrup et Thomsen, 3 – 4 μm, marine
- Dicrateria inornata Parke, 3 – 5.5 μm, marine
- Ericiolus spiculiger Thomsen, 3 – 3.8 μm, marine
- Imantonia rotunda Reynolds, 2 – 4 μm, marine
- Phaeocystis cordata Zingone, 3 – 4 μm, marine
- Phaeocystis pouchetii Lagerheim, 3 – 8 μm, marine
- Trigonaspis minutissima H.A.Thomsen, 2 – 3.6 μm, marine
- Minidiscus comicus Takano, 2 – 7 μm, marine
- Minidiscus trioculatus Hasle, 2.5 – 3.8 μm, marine
- Minidiscus spinulosus Gao, Chang et Chin, 3 – 5 μm, marine
- Minidiscus chilensis Rivera, 3 – 7.5 μm, marine
- Minutocellus polymorphus Hasle, von Stosch et Syverstsen, 2 – 30 μm, marine
- Minutocellus scriptus Hasle, von Stosch et Syverstsen, 3 – 36 μm, marine
- Skeletonema menzelii Guillard, Carpenter et Reimann, 2 – 7 μm, marine
- Skeletonema pseudocostatum Medlin, 2 – 9 μm, marine
- Skeletonema japonicum Zingone et Sarno, 2 – 10 μm, marine
- Skeletonema grethae Zingone et Sarno, 2 – 10.5 μm, marine
- Skeletonema marinoi Sarno et Zingone, 2 – 12 μm, marine
- Thalassiosira pseudonana Hasle et Heimdal, 2.3 – 5.5 μm, marine
- Bolidomonas pacifica Guillou et Chrétiennot-Dinet, 1 – 1.7 μm, marine
- Bolidomonas mediterranea Guillou et Chrétiennot-Dinet, 1 – 1.7 μm, marine
- Ollicola vangoorii Conrad (Vors), 2.5 – 5 μm, marine
- Tetraparma pelagica Booth et Marchant, 2.2 – 2.8 μm, marine
- Tetraparma insecta Bravo-Sierra et Hernández-Becerril, 2.8 – 3.8 μm, marine
- Triparma laevis Booth, 2.2 – 3.1 μm, marine
- Triparma columacea Booth, 2.3 – 4.7 μm, marine
- Triparma retinervis Booth, 2.7 – 4.5 μm, marine
- Florenciella parvula Eikrem, 3 – 6 μm, marine
- Nannochloropsis granulata Karlson et Potter, 2 – 4 μm, marine
- Nannochloropsis salina Hibberd, 3 – 4 μm, brackish
- Nannochloropsis oceanica Suda et Miyashita, 3 – 5 μm, marine
- Aureococcus anophagefferens Hargraves et Sieburth, 1.5 – 2 μm, marine
- Aureoumbra lagunensis Stockwell et al., 2.5 – 5 μm, marine
- Pelagococcus subviridis Norris, 2.5 – 5.5 μm, marine
- Pelagomonas calceolata Andersen et Saunders, 2 – 3 μm, marine
- Pinguiochrysis pyriformis Kawachi, 1 – 3 μm, marine
- Pinguiococcus pyrenoidosus Andersen et al., 3 – 8 μm, marin
- Massisteria marina Larsen et Patterson, 2.5 – 6.5 μm, marine
- Phagomyxa odontellae Kühn, Schnepf & Bulman, 3 – 4 μm, marine
- Caecitellus parvulus Patterson et al., 3 – 10 μm, marine
- Pseudobodo minima Ruinen, 2 μm, marine
- Symbiomonas scintillans Guillou et Chrétiennot-Dinet, 1.2 – 1.5 μm, marine
- Paraphysomonas imperforata Lucas, 1.7 – 5.1 μm, marine
- Paraphysomonas corbidifera Pennick and Clarke, 2 – 3.25 μm, marine
- Paraphysomonas antarctica Takahashi, 2 – 4.3 μm, marine
- Paraphysomonas caelifrica Preisig and Hibberd, 2.5 – 5 μm, marine
- Paraphysomonas cribosa Lucas, 3 – 4 μm, marine
- Paraphysomonas sideriophora Thomsen, 3 – 5 μm, marine
- Paraphysomonas capreolata Preisig and Hibberd, 3 – 6.5 μm, marine
- Paraphysomonas gladiata Preisig and Hibberd, 3 – 8 μm, marine
- Picophagus flagellatus Guillou et Chrétiennot-Dinet, 1.4 – 2.5 μm, marine