Re: Will a common amoeba eat a common euglena?

In answer to your question, there may be anecdotal evidence for amoeba
eating euglena, but I am not aware that this has been published in the
scientific literature.  There are amoeba that are called "preying", because
they have the ability to capture and feed on other protists.  An example is
an amoeba which is called "Chaos", which eats paramecia.  Although amoeba
move very slowly compared with ciliated protozoa (such as paramecia) or
flagellated protozoa (such as euglena), some nevertheless have the ability
(probably because they are sticky like flypaper) to capture fast swimmers.  

To see for yourself if this is the case, I suggest ordering the protozoa,
mixing them together, and observing them under a microscope.  Ordering
information is below:

Carolina Science and Math Catalog 67
1-800-334-5551 (to place an order, they accept credit cards)

(1) Preying Protozoa Set
        Catalog# P7-13-1004
        Price $10.00

(2) Euglena
        Catalog#P7-13-1768
        Price $5.00

Good Luck!
-Daniel Wexler