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| Opercularia is named for a ciliated flap (operculum) (oper) that is adoral to the opening to the oral region. However, this operculum is pulled back into the body when the myonemes are fully contracted as in this figure. The cilia bordering the operculum arise from the perioral kinetids (pek). mac, macronucleus. EM taken on 6/13/69 by R. Allen with Philips 300 TEM. Neg. 4,270X. Bar = 1µm. |
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