Nisiturris ryalli is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.Bouchet, P. (2015). Nisiturris ryalli (Peñas & Rolán, 1997). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=731399 on 2015-04-13
References
Robba E. (2013) Tertiary and Quaternary fossil pyramidelloidean gastropods of Indonesia. Scripta Geologica 144: 1–191.
External links USNM Invertebrate Zoology Mollusca Collection World Register of Marine Species