Macromphalina apexplanum is a species of very small sea snail, a marine gastropod mollusk in the family Vanikoridae.

[2] The organism is distributed across the Western Atlantic[3] and can be found in Panama, Colombia, Antigua; and Trinidad & Tobago.

[4] The maximum recorded shell length is 1.5 mm.

[5] The minimum recorded depth is 10 m; the maximum recorded depth is 25 m.[5]

This Vanikoridae-related article is a stub.