Choricystis
Choricystis is a genus of green algae in the class Trebouxiophyceae, considered a characteristic picophytoplankton in freshwater ecosystems. Choricystis, especially the type species , has been proposed as an effective source of fatty acids for biofuels. Choricystis algacultures have been shown to survive on wastewater. In particular, Choricystis has been proposed as a biological water treatment system for industrial waste produced by the processing of dairy goods.
Choricystis have been found in natural bodies of water in South America, North America, Europe, Asia, and Antarctica. They have been observed as an endosymbiont of freshwater sponges as well as ciliates like Paramecium bursaria.
Description
Choricystis consists of solitary cells without a mucilage sheath surrounding them. Cells are uninucleate with a single parietal chloroplast. Chloroplasts lack pyrenoids. Reproduction occurs asexually by the formation of autospores; in field conditions, usually two are produced per cell, but in culture four per cell may be present as well. Zoospores or sexual reproduction have not been observed in this genus.Identification of species within this genus is difficult because of few distinguishing morphological characters; species are now distinguished from each other using DNA barcodes.