Taken primarily from Kozloff, 1987, 1996 p. 199 (Copyright 1987, 1996, University of Washington Press. Used in this web page by permission of University of Washington Press)
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| Lower taxonomic level | Main Page | Alphabetic Index | Systematic Index | Glossary |
| 1a | Exterior of shell smooth, bluish black; holes circular and flush with the surface (length up to about 15 cm; not likely to be found north of Oregon) | Haliotis cracherodii |
| 1b | Exterior of shell lumpy, wavy, or with spiral ridges crossed by raised striations; reddish (sometimes with mottling); holes oval and slightly raised | 2 |
| 2a | Exterior of shell with low spiral ridges crossed by closely spaced, raised striations (without a muscle scar; reddish, with pale green, blue, or nearly white mottling; length up to about 15 cm, but rarely greater than 12 cm; not likely to be found north of Oregon) | Haliotis walallensis |
| 2b | Exterior of shell lumpy or wavy | 3 |
| 3a | Shell thin, without an obvious muscle scar; length up to about 15 cm | Haliotis kamtschatkana |
| 3b | Shell thick, with a prominent muscle scar; length to about 30 cm (not likely to be found north of Oregon) | Haliotis rufescens |