Macromphalina apexplanumMacromphalina apexplanum is a species of very small sea snail, a marine gastropod mollusk in the family Vanikoridae.DistributionThe organism is distributed across the Western Atlantic and can be found in Panama, Colombia, Antigua; and Trinidad & Tobago.DescriptionThe maximum recorded shell length is.HabitatThe minimum recorded depth is ; the maximum recorded depth is.