Taken primarily from Kozloff, 1987, 1996 (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 | Length sometimes exceeding 18 cm; color mostly uniformly olive-green [or olive-brown], even in small specimens (some, however, have radiating purplish bands near the umbones); anterior edge of internal supporting rib diverging at an angle of about 30 degrees form the dorsoventral axis (intertidal on exposed sandy beaches, and also subtidal) | Siliqua (Siliqua) patula |
| 1b | Length up to about 5 cm; color not primarily olive-green; anterior edge of internal supporting rib diverging not more than 15-20 degrees from the dorsoventral axis | 2 |
| 2a | Valves with concentric brown bands alternating with light cream or tan bands; subtidal | Siliqua (Siliqua) sloati |
| 2b | Valves with radial bands of a purplish color on a whitish tan background; low intertidal and subtidal (not likely to be found north of California) | Siliqua (Siliqua) lucida |