Other forms only have three oral membranelles, sometimes extending out of the oral cavity, with or without a paroral membrane.
2.
The Microthoracida typically have three or more oral membranelles, with at least a vestige of the paroral membrane occurring during cell division.
3.
The oral cilia are in general distinctly tetrahymenal, with three membranelles and a paroral membrane, which corresponds only to the middle segment of the tripartite membranes found in certain scuticociliates.
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