Source: Pennak's Freshwater Invertebrates of the United States, pg. 19, cites source as from Tryon, 1875, Smithson. Misc. Coll. 253:1-435
| Taxonomic Hierarchy | |
| Kingdom | Animalia – Animal, animals |
| Phylum | Mollusca – molluscs, mollusks |
| Class | Gastropoda Cuvier, 1797 – gastropods, slugs, snails |
| Order | Neotaenioglossa |
| Family | Pleuroceridae |
| Genus | Io I. Lea, 1831 |
| Species | Io fluvialis (Say, 1825) – spiny riversnail |
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