High speed light microscopy of a Synchaeta rotifer (family Synchaetidae) ingesting Peridinium (family Peridiniaceae, yellow), a motile dinoflagellate. You can see a Peridinium digesting in the stomach of the largest Synchaeta. It later takes another Peridinium into its mouth before spitting it out. The Synchaeta head has a crown of cilia that draws a vortex of water into the mouth. Synchaeta is a small predator, approximately 0.45 millimetres in length. Peridinium are 30-70 micrometres in length and covered in a thick plate armour of thecal plates. Filmed with darkfield illumination.