
Nannochloropsis is a genus of alga comprising 6 known species. The genus in the current taxonomic classification was first termed by Hibberd (1981). The species have mostly been known from the marine environment but also occur in fresh and brackish water. All of the species are small, nonmotile spheres which do not express any distinct morphologic...
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http://en.wikipedia.org/wiki/Nannochloropsis

(from the article `algae`) ...described, with probably more to be discovered; mostly small, pale green, and spherical; fewer than 15 species; Eustigmatos and ...
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http://www.britannica.com/eb/a-z/n/6
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