List of

eukaryotic Eukaryotes () are organisms whose Cell (biology), cells have a cell nucleus, nucleus. All animals, plants, fungi, and many unicellular organisms, are Eukaryotes. They belong to the group of organisms Eukaryota or Eukarya, which is one of the ...

species that belong to

picoplankton Picoplankton is the fraction of plankton composed by cells between 0.2 and 2 μm that can be either prokaryotic and eukaryotic phototrophs and heterotrophs: * photosynthetic * heterotrophic They are prevalent amongst microbial plankton communit ...

, meaning one of their cell dimensions is smaller than 3 μm.

Autotrophic species

Chlorophyta Chlorophyta or Prasinophyta is a taxon of green algae informally called chlorophytes. The name is used in two very different senses, so care is needed to determine the use by a particular author. In older classification systems, it refers to a ...

Chlorophyceae

* '' Stichococcus cylindricus'' Butcher, 3 – 4.5 μm, brackish

Pedinophyceae

* '' Marsupiomonas pelliculata'' Jones ''et al.'', 3 – 3 μm, brackish-marine * '' Resultor micron'' Moestrup, 1.5 – 2.5 μm, marine

Prasinophyceae The prasinophytes are a group of unicellular green algae. Prasinophytes mainly include marine planktonic species, as well as some freshwater representatives.Sym, S. D. and Pienaar, R. N. 1993. The class Prasinophyceae. In Round, F. E. and Chapma ...

* '' 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 ''Micromonas'' is a genus of green algae in the family ''Mamiellaceae''. Before the characterization in 2016 of a second species, ''Micromonas commoda'', ''Micromonas pusilla'' was considered to be the only species in the genus, which led to a d ...

'' Manton et Parke, 1 – 3 μm, marine * ''

Ostreococcus tauri ''Ostreococcus tauri'' is a unicellular species of marine green alga about 0.8 micrometres (μm) in diameter, the smallest free-living (non- symbiotic) eukaryote yet described. It has a very simple ultrastructure, and a compact genome. As a c ...

'' 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

Trebouxiophyceae The Trebouxiophyceae are a class of green algae, in the division Chlorophyta. Their circumscription within the green algae is not well established due to the need for more genetic studies at higher levels within the group. Genera without interve ...

* '' 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

Cryptophyta The cryptophyceae are a class of algae, most of which have plastids. About 220 species are known, and they are common in freshwater, and also occur in marine and brackish habitats. Each cell is around 10–50 μm in size and flattened in shape ...

Cryptophyceae The cryptophyceae are a class of algae, most of which have plastids. About 220 species are known, and they are common in freshwater, and also occur in marine and brackish habitats. Each cell is around 10–50 μm in size and flattened in shape ...

* '' Hillea marina'' Butcher, 1.5 – 2.5 μm, marine

Haptophyta The haptophytes, classified either as the Haptophyta, Haptophytina or Prymnesiophyta (named for '' Prymnesium''), are a clade of algae. The names Haptophyceae or Prymnesiophyceae are sometimes used instead. This ending implies classification at ...

Prymnesiaceae Prymnesiaceae is a family of algae in the clade Haptophyta. It contains toxic microalgae such as ''Prymnesium''. Genera * '' Apistonema'' * '' Chrysocampanula'' * '' Chrysoculter'' * '' Corymbellus'' * '' Haptolina'' * '' Hyalolithus'' * '' Ima ...

* '' 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 ''Phaeocystis'' is a genus of algae belonging to the Prymnesiophyte class and to the larger division of Haptophyta. It is a widespread marine phytoplankton and can function at a wide range of temperatures ( eurythermal) and salinities (euryhali ...

'' Lagerheim, 3 – 8 μm, marine * '' Trigonaspis minutissima'' H.A.Thomsen, 2 – 3.6 μm, marine

Heterokontophyta (
Stramenopiles Stramenopile is a clade of organisms distinguished by the presence of stiff tripartite external hairs. In most species, the hairs are attached to flagella, in some they are attached to other areas of the cellular surface, and in some they have be ...
)

Bacillariophyceae Bacillariophyceae is a group of pennate diatoms with a raphe (raphids). According to Ruggiero et al., 2015, the diatoms are treated as follows. This treatment largely reflects that used by Algaebase as at 2015, and is also reflected in the curren ...

* '' 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 ''Skeletonema marinoi'' is a diatom. Together with '' S. dohrnii'', this species has flattened extremities of the processes of the fultoportulae, which interlock with those of succeeding valves without forming knuckles. See also *Imidazolium * ...

'' Sarno et Zingone, 2 – 12 μm, marine * ''

Thalassiosira pseudonana ''Thalassiosira pseudonana'' is a species of marine centric diatoms. It was chosen as the first eukaryotic marine phytoplankton for whole genome sequencing. ''T. pseudonana'' was selected for this study because it is a model for diatom physiology ...

'' Hasle et Heimdal, 2.3 – 5.5 μm, marine

Bolidophyceae Bolidophyceae is a class of photosynthetic heterokont picophytoplankton, and consist of less than 20 known species. They are distinguished by the angle of flagellar insertion and swimming patterns as well as recent molecular analyses. Bolidophyc ...

* '' Bolidomonas pacifica'' Guillou et Chrétiennot-Dinet, 1 – 1.7 μm, marine * '' Bolidomonas mediterranea'' Guillou et Chrétiennot-Dinet, 1 – 1.7 μm, marine

Chrysophyceae The Chrysophyceae, usually called chrysophytes, chrysomonads, golden-brown algae or golden algae are a large group of algae, found mostly in freshwater. Golden algae is also commonly used to refer to a single species, '' Prymnesium parvum'', whic ...

* '' Ollicola vangoorii'' Conrad (Vors), 2.5 – 5 μm, marine * ''

Tetraparma pelagica ''Tetraparma'' is a genus of unicellular algae in the family Triparmaceae in the order Parmales. They form siliceous plates on the cell surface that aid in identification. ''Tetraparma'' is distinguished by its possession of three shield plates ...

'' Booth et Marchant, 2.2 – 2.8 μm, marine * '' Tetraparma insecta'' Bravo-Sierra et Hernández-Becerril, 2.8 – 3.8 μm, marine * ''

Triparma laevis ''Triparma'' is a genus of unicellular algae in the family Triparmaceae in the order Parmales. They form siliceous plates on the cell surface that aid in identification. ''Triparma'' is distinguished by its possession of three shield plates, th ...

'' Booth, 2.2 – 3.1 μm, marine * ''

Triparma columacea ''Triparma'' is a genus of unicellular algae in the family Triparmaceae in the order Parmales. They form siliceous plates on the cell surface that aid in identification. ''Triparma'' is distinguished by its possession of three shield plates, th ...

'' Booth, 2.3 – 4.7 μm, marine * ''

Triparma retinervis ''Triparma'' is a genus of unicellular algae in the family Triparmaceae in the order Parmales. They form siliceous plates on the cell surface that aid in identification. ''Triparma'' is distinguished by its possession of three shield plates, th ...

'' Booth, 2.7 – 4.5 μm, marine

Dictyochophyceae Dictyochophyceae sensu lato is a photosynthetic lineage of heterokont algae. Taxonomy * Class Dictyochophyceae Silva 1980 s.l. Subclass Sulcophycidae Cavalier-Smith 2013 * Order Olisthodiscales Cavalier-Smith 2013 **** Family Olisthodis ...

* '' Florenciella parvula'' Eikrem, 3 – 6 μm, marine

Eustigmatophyceae Eustigmatophytes are a small group (17 genera; ~107 species) of eukaryotic forms of algae that includes marine, freshwater and soil-living species. All eustigmatophytes are unicellular, with coccoid cells and polysaccharide cell walls. Eust ...

* '' 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

Pelagophyceae

* '' 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

Pinguiophyceae Pinguiochrysidaceae is a family of marine Heterokontophyta. It is the only family in the order Pinguiochrysidales, which is the only order in the class Pinguiophyceae. It includes five species of unicellular organisms with high concentration of p ...

* '' Pinguiochrysis pyriformis'' Kawachi, 1 – 3 μm, marine * '' Pinguiococcus pyrenoidosus'' Andersen ''et al.'', 3 – 8 μm, marin

Heterotrophic species

Cercozoa

Cercomonadida

* '' Massisteria marina'' Larsen et Patterson, 2.5 – 6.5 μm, marine

Plasmodiophorida

* '' Phagomyxa odontellae'' Kühn, Schnepf & Bulman, 3 – 4 μm, marine

Stramenopiles Stramenopile is a clade of organisms distinguished by the presence of stiff tripartite external hairs. In most species, the hairs are attached to flagella, in some they are attached to other areas of the cellular surface, and in some they have be ...

Bicosoecida

* '' 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

Chrysophyceae The Chrysophyceae, usually called chrysophytes, chrysomonads, golden-brown algae or golden algae are a large group of algae, found mostly in freshwater. Golden algae is also commonly used to refer to a single species, '' Prymnesium parvum'', whic ...

* '' 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 {{plankton Biological oceanography Planktology Aquatic ecology

Picoplankton Picoplankton is the fraction of plankton composed by cells between 0.2 and 2 μm that can be either prokaryotic and eukaryotic phototrophs and heterotrophs: * photosynthetic * heterotrophic They are prevalent amongst microbial plankton communit ...

Chlorophyta Chlorophyta or Prasinophyta is a taxon of green algae informally called chlorophytes. The name is used in two very different senses, so care is needed to determine the use by a particular author. In older classification systems, it refers to a ...

Prasinophyceae The prasinophytes are a group of unicellular green algae. Prasinophytes mainly include marine planktonic species, as well as some freshwater representatives.Sym, S. D. and Pienaar, R. N. 1993. The class Prasinophyceae. In Round, F. E. and Chapma ...

Trebouxiophyceae The Trebouxiophyceae are a class of green algae, in the division Chlorophyta. Their circumscription within the green algae is not well established due to the need for more genetic studies at higher levels within the group. Genera without interve ...

Cryptophyta The cryptophyceae are a class of algae, most of which have plastids. About 220 species are known, and they are common in freshwater, and also occur in marine and brackish habitats. Each cell is around 10–50 μm in size and flattened in shape ...

Cryptophyceae The cryptophyceae are a class of algae, most of which have plastids. About 220 species are known, and they are common in freshwater, and also occur in marine and brackish habitats. Each cell is around 10–50 μm in size and flattened in shape ...

Haptophyta The haptophytes, classified either as the Haptophyta, Haptophytina or Prymnesiophyta (named for '' Prymnesium''), are a clade of algae. The names Haptophyceae or Prymnesiophyceae are sometimes used instead. This ending implies classification at ...

Prymnesiaceae Prymnesiaceae is a family of algae in the clade Haptophyta. It contains toxic microalgae such as ''Prymnesium''. Genera * '' Apistonema'' * '' Chrysocampanula'' * '' Chrysoculter'' * '' Corymbellus'' * '' Haptolina'' * '' Hyalolithus'' * '' Ima ...

Heterokontophyta (Stramenopiles Stramenopile is a clade of organisms distinguished by the presence of stiff tripartite external hairs. In most species, the hairs are attached to flagella, in some they are attached to other areas of the cellular surface, and in some they have be ...)

Bacillariophyceae Bacillariophyceae is a group of pennate diatoms with a raphe (raphids). According to Ruggiero et al., 2015, the diatoms are treated as follows. This treatment largely reflects that used by Algaebase as at 2015, and is also reflected in the curren ...

Bolidophyceae Bolidophyceae is a class of photosynthetic heterokont picophytoplankton, and consist of less than 20 known species. They are distinguished by the angle of flagellar insertion and swimming patterns as well as recent molecular analyses. Bolidophyc ...

Chrysophyceae The Chrysophyceae, usually called chrysophytes, chrysomonads, golden-brown algae or golden algae are a large group of algae, found mostly in freshwater. Golden algae is also commonly used to refer to a single species, '' Prymnesium parvum'', whic ...

Dictyochophyceae Dictyochophyceae sensu lato is a photosynthetic lineage of heterokont algae. Taxonomy * Class Dictyochophyceae Silva 1980 s.l. ** Subclass Sulcophycidae Cavalier-Smith 2013 *** Order Olisthodiscales Cavalier-Smith 2013 **** Family Olisthodis ...

Eustigmatophyceae Eustigmatophytes are a small group (17 genera; ~107 species) of eukaryotic forms of algae that includes marine, freshwater and soil-living species. All eustigmatophytes are unicellular, with coccoid cells and polysaccharide cell walls. Eust ...

Pinguiophyceae Pinguiochrysidaceae is a family of marine Heterokontophyta. It is the only family in the order Pinguiochrysidales, which is the only order in the class Pinguiophyceae. It includes five species of unicellular organisms with high concentration of p ...

Stramenopiles Stramenopile is a clade of organisms distinguished by the presence of stiff tripartite external hairs. In most species, the hairs are attached to flagella, in some they are attached to other areas of the cellular surface, and in some they have be ...

Chrysophyceae The Chrysophyceae, usually called chrysophytes, chrysomonads, golden-brown algae or golden algae are a large group of algae, found mostly in freshwater. Golden algae is also commonly used to refer to a single species, '' Prymnesium parvum'', whic ...

Heterokontophyta (
Stramenopiles Stramenopile is a clade of organisms distinguished by the presence of stiff tripartite external hairs. In most species, the hairs are attached to flagella, in some they are attached to other areas of the cellular surface, and in some they have be ...
)

Dictyochophyceae Dictyochophyceae sensu lato is a photosynthetic lineage of heterokont algae. Taxonomy * Class Dictyochophyceae Silva 1980 s.l. Subclass Sulcophycidae Cavalier-Smith 2013 * Order Olisthodiscales Cavalier-Smith 2013 **** Family Olisthodis ...