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Euglena acus v. rigida - live 

As the name implies, this cell is rigid and slow moving. It swims continuously in one direction. The paramylon bodies appear rod-shaped in photo on the left. On the right, numerous chloroplasts show a slight spiral arrangement.  The cells average 5.5 to 10u in diameter and 118-125u long. Sample was collected in the Crescent Lake region of the St. John's River in April 2003.