Description. — Shell elongated, very fragile, whitish, with up to 8-10 spiral whorls. Upper part of the whorls is 40% of the height of the whorl, a little less on the first whorls, with a sculpture formed by opisthocyrt strongly curved growth lines. On the lower part of the whorls there are about 6-7 spiral furrows per whorl which with the slightly prosocyrt axial ribs form a regular pattern of elevated and axially elongated rectangles.
The holotype is 3.1 mm high. The largest shell of our material is only 2.9 mm high, but that specimen has a broken protoconch.
Distribution. — Known from the type locality (Australia), Japan and Vanuatu.
Remarks. — The only species with similar sculpture is M. cebuana Bandel, 2005 but this latter species has less convex whorls, the axial ribs are very irregular, the upper part of the whorl is narrower and it has a more prominent sculpture with impressed spiral lines.