Macromphalina pierrot (sometimes incorrectly emended as Macromphalina pierroti) is a species of very small sea snail, a marine gastropod mollusk in the family Vanikoridae.
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 20 m. Maximum recorded depth is 20 m.
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