Order Chlorococcales

Family Botryococcaceae Wille

Genus Dictyosphaerium Nägeli

• Dictyosphaerium ehrenbergianum Nägeli – planktonic; Verkhneye (Upper) Lake, Vodoprovodnoye (Potable water) Lake, Verkhneye Ershovskoe lake; rare (own data).
• Dictyosphaerium pulchellum Wood – planktonic; freshwater; common (own data).

Family Characiaceae (Nägeli) Wittrock

Genus Characium A. Braun in Kützing

• Characium acuminatum A. Braun ex Kützing – on filamentous algae; Verkhneye (Upper) Lake, Vodoprovodnoye (Potable water) Lake; common (own data).
• Characium conicum Korschikov – on filamentous algae; Verkhneye (Upper) Lake; rare (own data).

Family Chlorochytriaceae

Genus Chlorochytrium Cohn

• Chlorochytrium cohnii E. P. Wright – endophyte in Сeramium; Eremeevsky porog rapids; sporadic; Kylinia; littoral, sublittoral; Velikaya Salma; rare; Polysiphonia; littoral, sublittoral; common; Enteromorpha; littoral; rare (own data: Chlorocystis cohnii (Wright) Reinhard). This species needs clarification of nomenclature and ecological characteristics (Михайлова, 2010).
• Chlorochytrium inclusum Kjellman – endophyte in Callymenia; Malyi Eremeevsky Island; sporadic; Phyllophora; Biofiltry Bay; sporadic (own data). The stage Chlorochytrium inclusum Kjellman – is a sporophyte, and the stage Spongomorpha aeruginosa (Linnaeus) Hoek is a gametophyte) (Михайлова, 2010).
• Chlorochytrium porphyrae Setchell & Gardner – endophyte in Porphyra; Malyi Eremeevsky Island; sporadic (own data). This species needs clarification of nomenclature and ecological characteristics (Михайлова, 2010).

Family Chlorococcaceae Blackman & Tansley

Genus Chlorococcum Fries

• Chlorococcum botryoides (Kützing) Rabenhorst – epiphyte; freshwater; common (own data).
• Chlorococcum infusionum (Schrank) Meneghini – benthic, planktonic; freshwater, brackish-water; common (own data: Chlorococcum infusionum, Hypnomonas chlorococcoides Korschikov and Cystococcus humicola Nägeli).
• Chlorococcum olivaceum (Rabenhorst) Rabenhorst – on stones, wood in the water; freshwater; common (own data).

Genus Coccomyxa Schmidle

• Coccomyxa arvensis Jaag — planktonic, rare, freshwater supralittoral basin, Kindo peninsula.
• Coccomyxa confluens (Kützing) Fott – periphyton; Vodoprovodnoye (Potable water) Lake; sporadic (own data: Coccomyxa dispar Schmidle).

Family Chlorosarcinaceae

Genus Chlorosarcinopsis Herndon

• Chlorosarcinopsis minor (Gerneck) Herndon – planktonic; freshwater supralittoral, rainwater basins, лужи; common (own data).

Family Dictyosphaeriaceae G.S. West

Genus Dictyosphaerium Nägeli

• Dictyosphaerium ehrenbergianum Nägeli – freshwater, Verkhneye (Upper) Lake, Vodoprovodnoye (Potable water) Lake; planktonic (Бизина, 1998).

Family Golenkiniaceae (Korshikov) Komárek

Genus Golenkinia Chodat

• Golenkinia radiata Chodat – planktonic; lakes; common (own data).

Family Hydrodictyaceae Dumortier

Genus Pediastrum Meyen

• Pediastrum boryanum (Turpin) Meneghini – marine; planktonic; incidental species (Конопля, 1974). Freshwater, Verkhneye (Upper) Lake; planktonic (Бизина, 1998). Planktonic; freshwater, brackish-water supralittoral basins; rare (own data).
• Pediastrum duplex Meyen – freshwater, Verkhneye (Upper) Lake; planktonic (Бизина, 1998). Freshwater, brackish-water supralittoral basins, pools, rare; Verkhneye (Upper) Lake, Verkhneye and Nizhneye Ershovskoe lakes; common (own data).

Genus Hyaloraphidium Pascher & Korshikov

• Hyaloraphidium contortum Pascher & Korshikov – freshwater, Verkhneye (Upper) Lake, Vodoprovodnoye (Potable water) Lake; planktonic (Бизина, 1998).

Genus Stauridium Corda

• Stauridium tetras (Ehrenberg) E.Hegewald 2005 – freshwater., in the plankton of meromictic lake Trekhtzvetnoe (Mindolina, 2025; Ivanova, 2025, personal communication).

Genus Treubaria C. Bernard

• Treubaria schmidlei (Schröder) Fott & Kovácik – freshwater, Verkhneye (Upper) Lake, Vodoprovodnoye (Potable water) Lake; planktonic (Бизина, 1998).

Family Micractiniaceae G. M. Smith

Genus Golenkiniopsis Korschikov

• Golenkiniopsis minutissima (Iyengar & Balakrishnan) Starr – planktonic; lakes; rare (own data).

Genus Micractinium Fresenius

• Micractinium pusillum Fresenius – planktonic; lakes; rare (own data).

Family Oocystaceae Bohlin

Genus Chodatella Lemmermann

• Chodatella subsalsa Lemmermann – planktonic; lakes; common (own data).

Genus Kirchneriella Schmidle

• Kirchneriella subcapitata Korschikov – planktonic; Verkhneye (Upper) Lake, Vodoprovodnoye (Potable water) Lake; rare (own data).
• Kirchneriella lunaris (Kirchner) Moebius – planktonic; freshwater, brackish-water basins, pools; common (own data).

Genus Lagerheimia R. Chodat

• Lagerheimia genevensis (Chodat) Chodat – planktonic; lakes; rare (own data: Chodatella quadriseta Lemmermann).
• Lagerheimia longiseta (Lemmermann) Wille – planktonic; lakes; common (own data: Chodatella longiseta Lemmermann).
• Lagerheimia minor Fott – planktonic; freshwater supralittoral basins, lakes; common (own data).

Genus Muriella J. B.Petersen

• Muriella decolor Vischer – planktonic; freshwater supralittoral basins, pools; rare (own data).

Genus Oocystis Nägeli

• Oocystis borgei Snow – planktonic; freshwater, brackish-water basins, pools; common (own data).
• Oocystis solitaria Wittrock – planktonic, periphyton; freshwater, brackish-water basins, pools; common (own data).
• Oocystis submarina Lagerheim – planktonic, periphyton; freshwater, brackish-water basins, pools, brooks; from rare to often (own data).

Genus Selenastrum Reinsch

• Selenastrum bibraianum Reinsch – planktonic; freshwater; common, sometimes dominant (own data).

Genus Trochiscia Kützing

• Trochiscia aspera (Reinsch) Hansgirg – planktonic; freshwater, brackish-water supralittoral basins, pools, lakes; rare (own data).
• Trochiscia clevei Lemmermann – marine, planktonic (own data).
• Trochiscia multispinosa (Moebius) Lemmermann – marine, planktonic (own data).
• Trochiscia reticularis (Reinsch) Hansgirg 1888 – planktonic; Verkhneye Ershovskoe lake; rare (own data).

Family Radiococcaceae Fott ex P. C. Silva

Genus Coenococcus Korshikov

• Coenococcus polycoccus (Korshikov) Hindák – planktonic; Verkhneye (Upper) Lake; rare (own data: Sphaerocystis polycocca Korschikov).

Genus Coenocystis Korschikov

• Coenocystis planctonica Korschikov – planktonic; freshwater supralittoral basin; Cape Kindo; sporadic (own data).

Family Scenedesmасеае Oltmanns

Genus Actinastrum Lagerheim

• Actinastrum hantzschii Lagerheim – planktonic; lakes; rare (own data).

Genus Acutodesmus (Schröder) P.M.Tsarenko & D.M.John

• Acutodesmus acutiformis - renaming of previously listd in the Catalogue Scenedesmus acutiformis Schröder - freshwater. plankt., bogs; common (own data); in the plankton of meromictic lake Trekhtzvetnoe (Ivanova, 2025, personal communication).

Genus Coelastrum Nägeli

• Coelastrum astroideum De Notaris – planktonic; Vodoprovodnoye (Potable water) Lake ; rare (own data).
• Coelastrum microporum' Nägeli – planktonic; lakes; common (own data); in the plankton of meromictic lake Trekhtzvetnoe (Mindolina, 2025; Ivanova, 2025, personal communication).
• Coelastrum sphaericum Nägeli – planktonic; lakes; common (own data).

Род Comasiella E.Hegewald, M.Wolf, A.Keller, Friedl & Krienitz

• Comasiella arcuata (Lemmermann) E.Hegewald, M.Wolf, Al.Keller, Friedl & Krienitz 2010 - freshwater, in plankton of the meromictic lake Trekhtzvetnoe (Ivanova, 2025, pers. communication).

Genus Crucigenia Morren

• Crucigenia fenestrata Schmidle – planktonic; freshwater supralittoral basins, Verkhneye (Upper) Lake; rare (own data).
• Crucigenia rectangularis (Nägeli) Gay – freshwater, Verkhneye (Upper) Lake, Vodoprovodnoye (Potable water) Lake; planktonic (Бизина, 1998). Krugloe lake; sporadic (own data).
• Crucigenia tetrapedia (Kirchner) W. & G. S.West – planktonic; lakes; rare (own data).

Genus Scenedesmus Meyen

• Scenedesmus acuminatus (Lagerheim) Chodat – planktonic; freshwater, brackish-water supralittoral basins, pools, Verkhneye (Upper) Lake; common (own data).
• !!!Scenedesmus acutiformis Schröder – currently regarded as Acutodesmus acutiformis (Schröder) P.M.Tsarenko & D.M.John. – planktonic; freshwater, bogs; common (own data); in plankton of the meromictic lake Trekhtzvetnoe (Ivanova, 2025, pers. communication).
• Scenedesmus apiculatus (W. West & G. S. West) Chodat – freshwater, Verkhneye (Upper) Lake, Vodoprovodnoye (Potable water) Lake; planktonic (Бизина, 1998).
• !!!Scenedesmus obliquus (Turpin) Kützing (new name Tetradesmus obliquus, see below) – planktonic; freshwater, brackish-water supralittoral basins, pools; rare (own data).
• Scenedesmus quadricauda (Turpin) Brébisson – freshwater, Verkhneye (Upper) Lake; planktonic (Бизина, 1998). Planktonic; freshwater, brackish-water supralittoral basins, pools, lakes; common (own data).

Genus Tetradesmus G.M.Smith

• Tetradesmus obliquus (Turpin) Wynne (old name Scenedesmus obliquus, see above) - freshwater; isolated from water samples from meromictic lake Trekhtzvetnoe (Mindolina, 2025; Ivanova, 2025, personal communication).

Genus Tetrastrum Chodat

• Tetrastrum staurogeniaeforme (Schröder) Lemmermann & Tiffany – planktonic; Verkhneye (Upper) Lake; sporadic (own data).

Genus Westella De Wildermann

• Westella botryoides (W. West) De Wildeman – planktonic; Vodoprovodnoye (Potable water) Lake , Verkhneye Ershovskoe lake; common (own data: Tetracoccus botryoides West).

rus:Порядок Chlorococcales