See text Odostomia is the most speciose genus of minute sea snails, pyramidellid gastropod mollusks.

The genus Odostomia Fleming, 1813 was used by 19th century authors, particularly in the European literature, for most of the smaller Pyramidellidae.

For these, the database WoRMS has refrained from making new combinations not backed by (or implicit from) a published source but, unless otherwise noted, the species that were already "accepted" under a subgenus now raised to full genus have been marked as "accepted" under that full genus.

[1] The European and American species of Odostomia differ in several anatomical and shell characteristics.

Odostomia scalaris MacGillivray, 1843 is an ectoparasite on a wide range of hosts but especially known as a pest of mussels.

Odostomia turrita Hanley, 1844 has been found on the European lobster Homarus gammarus (Linnaeus, 1758).