|MadSci Network: General Biology|
So this seems like a pretty straightforward question, and for paramecia it is. Paramecia eat almost anything organic - other protists, small single celled fungi, bacteria, and organic materials floating in their surrounding environment.
Euglenas are a little different. Like paramecia they can eat a variety of living things around them. They do not have anything like a mouth, which paramecia do, so they eat things by engulfing them in a process called “endocytosis.” Euglenas have a trick up their sleeves though – they have chloroplasts, much like plants, and are therefore able to absorb light and create sugar from it in a process called photosynthesis. This means that they are not just heterotrophs (deriving theirenergy from eating other living things) or autotrophs (deriving their energy from sunlight) – they are a weird mix of the two.
I hope this bit of information helps you! Not a lot of protozoologists out there so keep thinking about Euglenas and Paramecia!
A description of paramecia, including what they eat.
A sweet video of paramecia eating yeast stained with Congo Red.
Tree of Life page for Euglenas – Tree of Life is great for this kind of research, by the way. Pay particular attention to the section, “Evolutionary History of the Euglenid Pellicle.”
Try the links in the MadSci Library for more information on General Biology.