Green paramecia (Paramecium bursaria) 2
Group: Paramecium · Paramecium (ciliate)
Compare with the Paramecium description: slipper or cigar shape, with an oral groove running diagonally to a mouth about halfway along.
Credit line
Video: Takahashi T, Shirai Y, Kosaka T, Hosoya H, CC BY 2.5, via Wikimedia Commons