Alvania gradatoides

Alvania gradatoides is a species of minute sea snail with an operculum, a marine gastropod mollusk in the family Rissoidae.

Distribution

 * New Zealand (off Oamaru)
 * Tasmania

Description
The length of the shell attains 3 mm, its diameter 1.6 mm.

Alvania gradatoides was originally discovered and described as Linemera gradatoides by Harold John Finlay in 1930.