Copulabyssia riosi is a species of sea snail, a marine gastropod mollusk in the family Pseudococculinidae.
Distribution This species occurs in the Atlantic Ocean off Brazil.
Description The maximum recorded shell length is 3.5 mm.Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. .
Habitat Minimum recorded depth is 960 m. Maximum recorded depth is 1320 m.
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