exploring - Seattle Aquarium

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STINGING-CELL ANIMALS: Cnidaria
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Aggregating Anemone
Anthopleura elegantissima
Averages 2” in diameter
Pink tipped tentacles
Mottled Anemone
Fried Egg Jelly
Phacellophora camtschatica
Up to 24” in diameter
Yellow in coloration
Water Jelly
Moonglow Anemone
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Urticina crassicornis
Averages 4” in diameter
Green, green and red, or solid
red column
FIELD GUIDE
exploring
Puget Sound Beaches
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Moon Jelly
SOFT-BODIED ANIMALS: Mollusca
Aurelia labiata
To 16” in diameter
Transparent with 4 distinct
“horseshoes”
Aequorea spp.
Up to 3” in diameter
Transparent with “bicycle spokes”
Anthopleura artemisia
To 3” translucent to green
Banded tentacles
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Giant Pacific (Japanese) Oyster
Crassostrea gigas
Up to 12” long
Look for purple and black coloration
Pacific Littleneck Clam
Protothaca staminea
Rounded shell to 3” wide
Short “teeth” on inside edge
of shell
Japanese Littleneck Clam
Venerupis philippinarum
Oblong shell to 3” wide
Purple coloration inside shell
Clinocardium nuttallii
Up to 5 1/2” long
Heart shaped - side view
Blue Mussel
Mask Limpet
Shield Limpet
Plate Limpet
Keyhole Limpet
Panopea abrupta
Oblong shell to 8” long
Immense neck to 4’ long
Heart Cockle
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Pacific Geoduck
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Rough Piddock
Hairy Chiton
Lottia pelta
Symmetric shell to 2 1/8” wide
Faint brown/white stripes
Tectura scutum
Flat shell to 2” wide
Green to gray color
Diodora aspera
To 2 3/4”
Prominent opening at top of shell
Mossy Chiton
Moon Snail
Periwinkles
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Tectura persona
Asymmetric shell to 1 1/2” wide
Faint brown/white stripes
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Mytilus trossulus
Very oblong shell to 4 1/2” long
Attaches to hard surfaces
Zirfaea pilsbryi
Up to 6” long
Burrows into soft rock or clay
Sea Lemon
Shaggy Mouse
Anisodoris nobilis
Average 4” long
Resembles lemon peel
Euspira lewisii
Round shell to 5 1/2” diameter
Look for plunger-like egg cases
Littorina spp.
Up to 5/8” long
Often occupied by hermit crabs
WORM
Aeolidia papillosa
Up to 2 3/4” long
Sea slug resembling wet mouse
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Nucella lamellosa
Up to 2” long
Commonly grouped under rocks
Mopalia muscosa
Up to 2 3/4” long
Perimeter covered in stiff hairs
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Frilled Dog Whelk
Mopalia ciliata
Up to 3” long
Perimeter covered in soft hairs
Notch in rear usually
Calcareous Tube Worm
Serpula vermicularis
To 2 1/2” long
Hard white tubes on sides of rocks
© Seattle Aquarium
www.seattleaquarium.org
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JOINTED-LEG ANIMALS: Arthropoda
1cm
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Acorn Barnacle
Thatched Barnacle
Isopods
Semibalanus cariosus
Up to 1 1/2” in diameter
Sharp spines on walls
Idotea wosnesenskii
Up to 1 3/8” long
Resemble “pillbugs”
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Balanus glandula
Up to 3/4” in diameter
White to gray in coloration
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Hermit Crab
Shore Crab
Hemigrapsus spp.
Carapace to 2 1/4” wide
Often found under rocks
Kelp Crab
Pugettia producta
Carapace to 3 1/2” wide
Very sharp shell, leg tips
Red Rock Crab
Cancer productus
Carapace to 8” wide
Tips of claws are black
Dungeness Crab
Cancer magister
Carapace to 9” wide
Claws have white tips
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SPINY-SKINNED ANIMALS: Echinodermata
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Pagurus spp.
Carapace to 1” wide
Uses empty snail shells
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Mottled Star
Sunflower Star
Red Sea Cucumber
Pycnopodia helianthoides
Up to 39” in diameter
Up to 24 arms
Cucumaria miniata
Average 6” long
Wedged under edge of rocks
Gunnel
Prickleback
Northern Clingfish
Sand Dollar
Dendraster excentricus
Up to 3” in diameter
Dark when alive
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Evasterias troschelii
Up to 16” in diameter
Orange, brown or blue-gray
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Purple Star
Pisaster ochraceus
Up to 14” in diameter
May be purple, orange or brown
FISHES
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Tidepool Sculpin
Pholidae
Up to 18” long
Eel-like fish under rocks
Stichaeidae
Gobiesox maeandricus
Up to 20” long
Up to 6 1/2” long
Some have crests above the head Uses suction to attach under rocks
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Oligocottus maculosus
Up to 3 1/2” long
Seen darting in tidepools
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PLANTS/SEAWEED
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Rockweed
Sea Lettuce
Ulva spp.
Up to 7” long
Thin green oblong blades
Sugar Kelp
Winged Kelp
Laminaria saccharina
Alaria marginata
Up to 11’ long 7” wide
Average 8’ to 10’ long, 6 to 8” wide
Large brown kelp with ruffled blades
Numerous wings at base
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Fucus spp
Forked blades average 7” long
Air sacks at end of blades
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Eelgrass
Zostera spp.
Up to 8’ long 1/2” wide
Forms meadows in sandy areas
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Bull Kelp
Nori
Porphyra spp.
To 2’ long
Thin brownish purple blades
Turkish Towel
Chondracanthus corymbiferus
To 20” long and 8” wide
Unique rough texture
Sargassum
Sargassum muticum
To 6 1/2' long
Yellowish brown with small floats
© Seattle Aquarium
www.seattleaquarium.org
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Nereocystis leutkeana
To 65’ long
Large float near end of stipe
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