Oh man i remember learning about this but i cant remember what the answer is i will see what I can do :D
The answer is Paramecium.
The paramecium is a unicellular ciliated protozoan. They are
often found in fresh water and brackish water areas. They have the elongated
shaped that looks like a rod and has the color violet under the stain because it signifies that it is positive.
Hey, how are you doing?
The answer to your question would be:

i believe.
Hope this helps, and if you need further help, contact me!
Thank you,
Darian D.