Macromphalina susoi is a species of very small sea snail, a marine gastropod mollusk in the family Vanikoridae.
Distribution It is found in the eastern Gulf of Mexico.
Description The maximum recorded shell length is 3.2 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 37 m. Maximum recorded depth is 37 m.
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