A look at the tube of Floscularia ringens, a rotifer from a freshwater sample from southern Thailand.

The tube is made up of small, rounded pellets constructed by the rotifer in a specialized organ on its corona called the modulus (Wright 1950). The pellets are made from a combination of detritus from the environment and secretions from the rotifer. The pellets are attached to an underlying membrane that provides support (Fontaneto et al., 2003).

This image is focus stacked from video frames. Nikon inverted diaphot, 40X oil immersion objective, Nikon D750 DSLR. FOV is 320 x 200 microns.