Margarya Nevil, 1877

Examined species: Margarya melanioides (Dautzenberg & Fischer, 1905) (Figs 2R, 3R, 6R).

Remarks: Margarya can be distinguished from other genera with a concentric inverted-comma-shaped operculum by the following combination of characters: a large nuclear region with many grains and veins, and a large inner opercular region.