Cerithiopsis fusiformis is a species of sea snail, a gastropod in the family Cerithiopsidae, which is known from the Gulf of Mexico and the Caribbean Sea. It was described by C. B. Adams, in 1850.Cerithiopsis fusiformis at World Register of Marine Species.

Description The maximum recorded shell length is 3.3 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 0 m. Maximum recorded depth is 165 m.

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