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Which caecilian family includes adults that live in water?

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Zoom in on the serpentine locomotion of the limbless, amphibious caecilian over soil — Gymnophiona Caecilian moving over soil.

The caecilian family that includes adults that live in water is the Typhlonectidae.1

While most caecilians lead subterranean existences, members of the family Typhlonectidae are characterized by their aquatic lifestyle. These animals are viviparous and have evolved specific secondary adaptations for living in water, where they prey on fishes, eels, and aquatic invertebrates.2134