Euglena acus
Euglenoids
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Olympusman
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Euglenoids
Euglena spirogyra var. abruptacuminata
Euglena acus
Euglena acus
Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA
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arturoag75
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carlos.uruguay
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Bruce Taylor
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Nice clear pics. 
E. acus -- properly known as Lepocinclis acus -- has a distinctly tapered anterior (like a tiny garfish! 
). Your creature is probably Lepocinclis oxyuris.
E. spirogyra, which now goes by the name of Lepocinclis spirogyroides, used to have a bunch of sub-varieties distinguished from one another by patterns of "periplast ornamentation" (the arrangement of the distinctive "warts" on the pellicle). In 2005, Kosmala et al. found these patterns to be "capricious," so the old varieties (including var. abrupte-acuminata Lemmermann 1913) are probably meaningless.
E. acus -- properly known as Lepocinclis acus -- has a distinctly tapered anterior (like a tiny garfish! ). Your creature is probably Lepocinclis oxyuris.E. spirogyra, which now goes by the name of Lepocinclis spirogyroides, used to have a bunch of sub-varieties distinguished from one another by patterns of "periplast ornamentation" (the arrangement of the distinctive "warts" on the pellicle). In 2005, Kosmala et al. found these patterns to be "capricious," so the old varieties (including var. abrupte-acuminata Lemmermann 1913) are probably meaningless.
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