On a picture of a Rhantus beetle I discovered some striking rotifers of about 1 millimeter long. One is visible between the antenna on the picture at right, the picture left below shows a cropped detail. Stephanoceros is a relatively large rotifer (wheel animalcule) with a crown or corona of flexible tentacles. On the tentacles are cilia, that are used to whirl in small rotifers, Protozoa and algae. When something enters the crown, the cilia are set perpendicular to the tentacles, so creating a little cage to prevent the escape of a possible prey. Then the tentacles bend inward and the snack is devoured. This can all be seen in good detail on a nice Youtube movie, by clicking the link lower on this page. Stephanoceros lives in barrel-shaped gel housing, which is so transparent that it can only be seen by the dirt covering it. On the picture at left it is recognisable only because the picture is digitally enhanced. In the same way the picture below shows the corona more clearly.