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Giant
Kelp Adult
Macrocystis pyrifera
brown alga attached by holdfast
size: up to 30 m (100 ft)
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Giant
Kelp Sub-Adult
Macrocystis pyrifera
visible split at base of blade
size: young plants up to 1 meter (3 ft)
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Juvenile
Kelp
various species of brown algae
no visible split in blade
size: up to ~10 cm (4 in)
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Bladder
Chain Algae
Cystoseira sp.
“chains” of pneumatocysts in upper part,
flattened blades
in lower part
size: up to 8 m (26 ft)
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California
Sea Palm
Pterygophora californica
woody unbranched stipe,
small branched holdfast
size:
up to 2.3 meters (7.5 ft)
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Turkish
Towel
Girgartina exasperata
Gigartina corymbifera
broad dark purplish-red blades
covered with bumps
size: blades up to 1 m (3 ft)
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Purple
Sea Urchin
Strongylocentrotus purpuratus
purple spines and test (shell)
juveniles may look greenish
size: test size up to 7 cm (3 in)
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Red
Sea Urchin
Strongylocentrotus franciscanus
red spines (dark maroon to light reddish-pink)
size: test size up to 18 cm (7 inches)
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White
Sea Urchin
Lytechinus anamesus
white spines, white with some
green/gray on test (shell)
size: test size up to 4 cm (1.5 in)
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Black
Crowned Sea Urchin
Centrostephanus coronatus
black ridged spines are three times
as long as the test (shell)
size: test size up to 6 cm (2.5 in),
spines up to 18 cm (7.5 in)
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Bat
Star
Asterina miniata
Webbed 5-arm shape, solid or mottled colors
(red, orange, yellow, brown, green, purple)
size: up to 20 cm (8 in)
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Golden
Gorgonian (close-up)
Muricea californica
look closely for yellow polyps
on “sea fan” branches
size: up to 1 m (3 ft)
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Kellet’s
Whelk
Kelletia kelletii
spiral whorls on robust shell,
check for hermit crabs in empty shells
size: up to 18 cm (7 in)
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Warty
Sea Cucumber
Parastichopus parvimensis
soft cylindrical orange-brown body
with pointy projections
size: up to 25 cm (10 in)
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