Goniomonas is a genus of single-celled eukaryotes, including both freshwater and marine species. It is unusual among the Cryptophyta in that it lacks plastids. It may reflect one of only a small number of times that the cryptophytes evolved into freshwater habitats. It is the only genus in the family Goniomonadaceae, when that is considered separate from Cryptomonadaceae, and the only member of the order Goniomonadales, when that is considered separate from the Cryptomonadales. Goniomonas seems to have a number of freshwater relatives which have not yet been cultured nor named (known as the CRY1 clade). It contains the three species Goniomonas amphinema, Goniomonas pacifica and Goniomonas truncata.
- "Goniomonas". Tree of Life Web Project. Retrieved June 29, 2009.
- Kamran Shalchian-Tabrizi, Jon Bråte, Ramiro Logares, Dag Klaveness, Cédric Berney & Kjetill S. Jakobsen (2008). "Diversification of unicellular eukaryotes: cryptomonad colonizations of marine and fresh waters inferred from revised 18S rRNA phylogeny". Environmental Microbiology 10 (10): 2635–2644. doi:10.1111/j.1462-2920.2008.01685.x. PMID 18643928.
- Guiry, M.D.; Guiry, G.M. (2008). "'Goniomonas'". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.
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