Cerithiopsis io is a species of sea snail, a gastropod in the family Cerithiopsidae, which is known from the Caribbean Sea and the Gulf of Mexico. It was described by Dall and Paul Bartsch in 1911.Cerithiopsis io at World Register of Marine Species.
Description The maximum recorded shell length is 2.3 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 5.4 m. Maximum recorded depth is 6 m.
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