STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Euglena. Coloured scanning electron micrograph showing Euglena sp., marine water protozoa. They belongs to the class of Flagellata whose members are characterised by one or more flagella and which are considered the most primitive form of the protozoa. Members of the genus Euglena are normally found in water puddles in such large numbers that they colour the water green (this sample from a marine rock pool). Euglena sp. may feed, depending on enviromental conditions, like plants (photosynthesis) or like animals, or both. They have a spindle-shaped body with a flagellum attached anteriorly; the external surface consists of a firm but elastic envelope. Magnification: x 4000 when printed at 10cm wide. Specimen courtesy of Mike Allen, Plymouth Marine Laboratory.
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