† Nuculana rhomboidea May, 1922 Ledella rhomboidea is an extinct species of sea snail, a marine bivalve mollusk in the family Nuculanidae.

(Original description) The shell is minute, smooth, white and shining.

It is rhomboidal, rounded in front, narrowly produced behind into a short beak.

The hinge line is arcuate, bearing arrow-shaped teeth, strong on the anterior slope, but less so posteriorly.

[2] This extinct marine species is endemic to Tasmania and were found in Tertiary strata.