<P> The idea of classifiying the euglenoids by their manner of nourishment was finally abandoned in the 1950s, when A. Hollande published a major revision of the phylum, grouping organisms by shared structural features, such as the number and type of flagella . If any doubt remained, it was dispelled in 1994, when genetic analysis of the non-photosynthesizing euglenoid Astasia longa confirmed that this organism retains sequences of DNA inherited from an ancestor that must have had functioning chloroplasts . </P> <P> In 1997, a morphological and molecular study of the Euglenozoa put Euglena gracilis in close kinship with the species Khawkinea quartana, with Peranema trichophorum basal to both . Two years later, a molecular analysis showed that E. gracilis was, in fact, more closely related to Astasia longa than to certain other species recognized as Euglena . In 2015, Dr Ellis O'Neill and Professor Rob Field have sequenced the transcriptome of Euglena gracilis, which provides information about all of the genes that the organism is actively using . They found that Euglena gracilis has a whole host of new, unclassified genes which can make new forms of carbohydrates and natural products . </P> <P> The venerable Euglena viridis was found to be genetically closer to Khawkinea quartana than to the other species of Euglena studied . Recognizing the polyphyletic nature of the genus Euglena, Marin et al. (2003) have revised it to include certain members traditionally placed in Astasia and Khawkinea . </P> <P> Starting in 2005, Tokyo - based Euglena Company has started marketing Euglena - based food and beverage products, based on their provision of both plant - and animal - based nutrients . While the fitness of euglena for human consumption had long been surmised, Euglena Co. was the first to develop a technique to cultivate and farm the microorganism in large enough quantities to be commercially viable . The company's main production facility is located on Ishigaki Island, Okinawa, due to favorable climate conditions . </P>

Which group of protists to euglena belong to
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