There were two of these protists in a pond water sample. They moved very quickly around the slide. Each had a single flagella, and an internal green mass.
ca. 300um long
Inside of a stone bird bath recently filled with rain. They were attached to a piece of plant litter and were eating small bits of material which they used cilia around the mouth to suck in.
The rotifers (Rotifera, commonly called wheel animals) make up a phylum of microscopic and near-microscopic pseudocoelomate animals. They were first described by Rev. John Harris in 1696, and other forms were described by Anton van Leeuwenhoek in 1703. Most rotifers are around 0.1–0.5 mm long (although their size can range from 50 μm to over 2 millimeters), and are common in freshwater environments throughout the world with a few saltwater species; for example, those of genus Synchaeta. Some...