Sicuophoridae

Sicuophorid ciliate, sucker covers large part of lower surface; body subcircular with flattened periphery.

Sicuophorid, sucker covers large part of lower surface; right apical suture extends back at least 1/2 body length; with filamentous or bacilliform skeletal elements.

Sicuophorid ciliates, sucker on only anterior half of inferior (=right) surface.

CIliates, right surface in part or whole as sucker with supporting polysaccharide elements; distinct preoral sutures; apical right and caudal right sutures present; endosymbionts of vertebrates.