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Class Eustigmatophyceae (“true eyespot”) was separated from the yellow-green Tribophyceae (Xanthophyceae) when the eyespot was found to lie outside the chloroplast (Hibberd and Leedale 1970, 1971, 1972). Other structural differences included their biflagellate condition although several have only a single emergent flagellum. The eyespot is described as “a large conspicuous orange-red body in the extreme anterior end of the motile cell." As of 2010 there are
eight genera in the class, including Chlorobotrys,
Ellipsoidion, |
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Hibberd, D.J., and G.F. Leedale 1970. Eustigmatophyceae – a new algal class with unique organization of the motile cell. Nature 225:758-760. Hibberd, D.J., and G.F. Leedale 1971. A new algal class – the Eustigmatophyceae. Taxon 20:523-525. Hibberd, D.J., and G.F. Leedale 1972. Observations on the cytology and ultrastructure of the new algal class, Eustigmatophyceae. Annals of Botany 36:49-71. Ott, D.W., and C.K. Oldham-Ott 2003. Eustigmatophyte, Raphidophyte, and Tribophyte Algae. In: Freshwater Algae of North America. Wehr, J.D., and R.G. Sheath, Eds. (pp. 423-469).
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