I found Chlamydodon mnemosyne in a tidal outlet in the village of Kloster on the island of Hiddensee. There were a only a few specimens in the samples.

Chlamydodon mnemosyne is a marine, cyrthophorid ciliate. The genus Chlamydodon is characterized by the possession of a unique organelle. A tubular structure runs along the margin of the body, which is reinforced by rings, similar to a suction tube with ring reinforcement. This organelle has already been studied in detail by earlier authors, but its function is still unknown. In Chlamydodon mnemosyne, this cross-striated band is continuous and encircles the entire body without interruption (s. fig. 2 a-b). This makes it easy to distinguish Chlamydodon mnemosyne from the similar species Chlamydodon triquetrus, whose cross-striated band is interrupted at the posterior end.

At 70 µm, the specimens in my population were somewhat smaller than indicated by Kahl (80–90 µm). All specimens possessed a clear orange pigment spot at the anterior end near the left margin (s. figs. 1 b and 2 a-b). The cytopharyngeal basket usually had 10–11 nematodesmal rods and the mouth opening was clearly oval.

More information and a video on Chlamydodon mnemosyne: Jeffrey Silverman-iNaturalist-Chlamydodon mnemosyne