Geleiidae is a family of karyorelict ciliates. It is sometimes synonymized with family Aveliidae.

Geleiidae are very large ciliates (200 μm to 5 mm), with a cylindrical shape, and a thinner, often beak-shaped, apical region. They are characterized by a ventral oral region, with buccal infraciliature organized into one intrabuccal kinety and an extrabuccal row.

The family name is based on Geleia, the type genus.

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