Cryptoglena
''Cryptoglena'' ''(/ˌkɹɪptoʊˈgliːnə/)'' is a genus of photosynthetic euglenids that was first described in 1831 by Christian Gottfried Ehrenberg. Today, its circumscription is controversial: Bicudo and MenezesBicudo, C.E. de M., Menezes, M. 2016. Phylogeny and Classification of Euglenophyceae: A Brief Review. Front. Ecol. Evol. doi: https://doi.org/10.3389/fevo.2016.00017 consider twenty-one species as ''Cryptoglena,'' of which, nine are uncertain. ''Cryptoglena'' species are water-based, living in both freshwater and marine environments. They are biflagellated, with one internal flagellum and one external flagellum, which allows movement through environments as demonstrated by Kim and ShinKim, J.-I., Shin, W.-G. 2007. Ultrastructure of ''Cryptoglena pigra'' from Korea. ALGAE 22, 325–331. doi: https://doi.org/10.4490/algae.2007.22.4.325 in the species ''C. pigra.'' The cells of ''Cryptoglena'' resemble a coffee bean, as they have a groove that runs the length of the cell o ...
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