Taken primarily from Kozloff, 1987, 1996 p. 201 (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 | Height more than twice the diameter; interior of shell not pearly (aperture about one-fourth the height of the shell; lower portions of whorls sometimes bulging slightly; spiral ridges numerous on each whorl, varying slightly in width and spacing; height not more than 7 mm; shallow subtidal, on sandy and gravelly substrata) | Halistylus pupoideus
(Carpenter, 1864) |
| 1b | Height much less than twice the diameter, interior of shell pearly | 2 |
| 2a | Columella with 1 or 2 small nodes (picture) | 3 |
| 2b | Columella without any nodes | 5 |
| 3a | Umbilicus covered by a callus, nearly always closed | 4 |
| 3b | Umbilicus open (picture) (periostracum brown) (Tegula pulligo in key) | |
| 4a | Shell with purplish black periostracum, and with a scaly band below the suture; with 2 nodes on the columella (the lower one often worn away) (picture); mid-intertidal on open coast (Tegula funebralis in key) | Chlorostoma funebralis
(A. Adams, 1855) |
| 4b | Shell with a brown periostracum, and without a scaly band below the suture; with 1 node on the columella; low intertidal, and not likely to be found north of Oregon (Tegula brunnea in key) | Chlorostoma brunnea
(Philippi, 1848) |
| 5a | Umbilicus decidedly open | 6 |
| 5b | Umbilicus closed (picture) (caution: in young specimens it may be open) | 15 |
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| 15a | Shell without spiral ridges, and with an almost waxy appearance (color usually white, yellowish, or pinkish); rare, not often encountered at depths of lesss than 100 m | Calliostoma platinum
Dall, 1890 |
| 15b | Shell with spiral ridges (picture), and without a waxy appearance; includes some intertidal as well as subtidal species | 16 |
| 16a | Spiral ridges beaded (picture, picture) | 17 |
| 16b | Spiral ridges not beaded (picture) | 20 |
| 17a | Beads on spiral ridges pronounced; base of body whorl decidedly convex; sutures between whorls deeply indented; periostracum gray, brown, or olive-green; subtidal | 18 |
| 17b | Beads on spiral ridges small and delicate (picture, picture); base of body whorl nearly flat (picture); sutures between whorls not deeply indented; periostracum not gray, brown, or olive-green, includes intertidal and subtidal species | 19 |
| 18a | Diameter about three-fourths of the height; periostracum gray or brown; height up to 4 cm; shallow subtidal | Cidarina cidaris
(Carpenter, 1864) |
| 18b | Diameter more than three-fourths of the height; periostracum olive-green; height up to 6 cm; mostly at depths of more than 350 m | Bathybembix bairdi
(Dall, 1889) |
| 19a | Shell usually orange-yellow, dotted with brown and with a bright purple or violet band encircling the lower edge of each whorl; with 8 or 9 whorls; body of living animal orange, with brown dorsal spots | Calliostoma annulatum
(Lightfoot, 1786) |
| 19b | Shell almost uniformly yellowish, tan, or pale pink; with 6-8 whorls; body of living animal cream with brown dorsal spots | Calliostoma variegatum
(Carpenter, 1864) |
| 20a | Whorls, as the shell is viewed in profile, almost flat; periostracum more nearly tan or brown than pinkish brown or reddish brown; not common | Calliostoma canaliculatum
(Lightfoot, 1786) |
| 20b | Whorls slightly convex; periostracum usually pinkish brown or reddish brown, common | Calliostoma ligatum
(Gould, 1849) |
Calliostoma annulatum
Calliostoma ligatum
Calliostoma variegatum
Chlorostoma brunnea
Tegula funebralis
Tegula eiseni
