Belongs within: Epitoniidae.
The subgenus Nitidiscala includes relatively small and delicate representatives of the genus Epitonium.
<==Epitonium (Nitidiscala De Boury 1909)O27
|--E. (N.) berryi Dall 1907O27
|--E. (N.) caamanoi Dall & Bartsch 1910O27
|--E. (N.) californicum Dall 1917O27
|--E. (N.) catalinense Dall 1917O27
|--E. (N.) columbianum Dall 1917O27
|--E. (N.) crebricostatum Carpenter 1886O27
|--E. (N.) densiclathratum Dall 1917O27
|--E. (N.) diegensis Dall 1917O27
|--E. (N.) fallaciosum Dall 1917O27
|--E. (N.) hexagonum (Sowerby 1844) [=Scalaria hexagona]O27
|--‘Scalaria’ (N.) hindsii Carpenter 1856O27
|--E. (N.) inconspicuum Sowerby 1847O27
|--E. (N.) indianorum (Carpenter 1865) [=Scalaria indianorum]O27
|--E. (N.) persuturum Dall 1917O27
|--E. (N.) rectilaminatum Dall 1907O27
|--E. (N.) regiomontanumO27
|--E. (N.) sawinae (Dall 1903) [=Scala sawinae]O27
|--E. (N.) skoglundae DuShane 1974BC01
|--E. (N.) subcoronatum (Carpenter 1866) [=Scalaria subcoronata]O27
`--E. (N.) tiara Carpenter 1856O27
*Type species of generic name indicated
References
[BC01] Boyko, C. B., & J. R. Cordeiro. 2001. Catalog of Recent type specimens in the Division of Invertebrate Zoology, American Museum of Natural History. V. Mollusca, part 2 (class Gastropoda [exclusive of Opisthobranchia and Pulmonata], with supplements to Gastropoda [Opisthobranchia], and Bivalvia). Bulletin of the American Museum of Natural History 262: 1–170.
[O27] Oldroyd, I. S. 1927. The Marine Shells of the West Coast of North America vol. 2 pt 2. Stanford University Press: Stanford University (California).