Filter flukes

A non-sentient invertebrate species engineered to filter and purify water. On Earth the species was strictly controlled, infertile and completely biodegradable; they all perished when their habitats were shut down during the Flutter, and all trace of them subsequently vanished from the biosphere.

Colloquially, filter flukes were known by a variety of crude nicknames. Their size, shape, and bio-engineered peristaltic design for the consumption of semi-liquid waste allegedly made them physiologically suited for sexual use by humanoid males.

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