†Orthonychiidae is an extinct taxonomic family of fossil sea snails, marine, gastropod mollusks in the clade Cyrtoneritimorpha.

[2] There is an unusually great degree of variability within the shells of species in the genus Orthonychia,[1] but an analysis of this variability has not been done yet (2008).

[1] Genus Orthonychia Hall, 1843[3]

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