| 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 |
| 6a |
|
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| 6b |
|
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| 7a |
|
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| 7b |
|
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| 8a |
|
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| 8b |
|
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| 9a |
|
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| 9b |
|
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| 10a |
|
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| 10b |
|
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| 11a |
|
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| 11b |
|
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| 12a |
|
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| 12b |
|
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| 13a |
|
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| 13b |
|
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| 14a |
|
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| 14b |
|
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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) |
