Chlorococcales is a formerly recognized order of green algae in the class Chlorophyceae. , the type family Chlorococcaceae was placed in the order Chlamydomonadales.
Conventionally, many groups of coccoid green algae were lumped in the order Chlorococcales sensu lato by Komárek & Fott (1983), based on Pascher's (1918) idea of establishing orders according to life forms. However, coccoid green algae are currently placed in several orders of Chlorophyceae, Trebouxiophyceae, Ulvophyceae (e.g., Chlorocystis) and Prasinophyceae within the division Chlorophyta, or in the division Charophyta (e.g., Chlorokybales, Desmidiales).Krienitz, L. & C. Bock 2012. Present state of the systematics of planktonic coccoid green algae of inland waters. Hydrobiologia 698(1):295-326.
Families According to Komárek & Fott (1983): Chlorococcaceae (Chlorococcoideae, Spongiococcoideae) Palmellaceae (Hormotiloideae, Palmelloideae, Neochloridoideae, Chlorosarcinoideae) Chlorochytriaceae Dicranochaetaceae Characiaceae (Fernandinelloideae, Characioideae, Schroederioideae) Treubariaceae Golenkiniaceae Hydrodictyaceae Micractiniaceae Botryococcaceae (Dictyosphaerioideae, Ecballocystoideae, Botryococcoideae) Radiococcoideae (Radiococcoideae, Disporoideae, Dictyochlorelloideae, Palmodictyoideae) Oocystaceae (Lagerheimiodeae, Oocystoideae, Eremosphaeroideae, Glaucocystoideae) Chlorellaceae (Siderocelidoideae, Chlorelloideae, Ankistrodesmoideae, Tetraedronoideae, Scotielloideae) Coelastraceae Scenedesmaceae (Coronastroideae, Danubioideae, Crucigenioideae, Tetrallantoideae, Scenedesmoideae, Dimorphococcoideae)
According to Smith (1938): Chlorococcaceae Endosphaeraceae Characiaceae Protosiphonaceae Hydrodictyaceae Oöcystaceae Scenedesmaceae
References
Bibliography Komarék, J.; Fott, B. 1983. Chlorophyceae (Grünalgen), Ordnung: Chlorococcales, In: Huber-Pestalozzi, G., (Ed), Das Phytoplankton des Susswasers; Systematik und Biologie. Stuttgart, E. Schweizerbart’sche Verlagsbuchhhandlung, Bd 7, fasc. 1, 1044p.