An organism belonging to or resembling the genus Ephydra or family Ephydridae.
From Ephydra with the suffix '-id,' which forms nouns meaning 'member of' or 'resembling,' as in 'humanoid' or 'android.'
The '-id' suffix can mean either 'resembling' or 'member of,' so an ephydrid could be an actual tardigrade or something that looks like one—it's a flexible suffix in science.
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