Macromphalina apexplanum is a species of very small sea snail, a marine gastropod mollusk in the family Vanikoridae.
Distribution The organism is distributed across the Western Atlantic and can be found in Panama, Colombia, Antigua; and Trinidad & Tobago.
Description The maximum recorded shell length is .Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. .
Habitat The minimum recorded depth is ; the maximum recorded depth is .
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