| Hymenostomatia |
a subclass of chiefly freshwater, ciliate protozoa (class Oligohymenophorea, phylum Ciliophora) with uniform, heavy body ciliature and a ventral buccal cavity when one is present; if kinetodesmata are present, they are usually conspicuous. It comprises three orders: Hymenostomatida, Scuticociliatida, and Astomatida.
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