Tidepool Organisms Bryozoans – colonial moss Cnidarians – stinging invertebrates Derby Hat Bryozoan Red Bryozoan Aggregating Anemone Giant Green Anemone Sunburst Anemone Eurystomella spp. Watersipora spp. Anthopleura elegantissima Anthopleura xanthogrammica Anthopleura sola

closed closed closed open 2 in (5 cm) open 6.7 in (17 cm) open 6.5 in (12cm) Echinoderms – spiny-skinned invertebrates Sea Stars note signs of wasting Bat Star Brittle Star Ochre Star Giant Pink Sea Star Six Armed Sea Star Sunflower Star Patiria miniata (various genuses) Pisaster ochraceus Leptasterias spp. Pycnopodia helianthoides

Purple or Red webbed

arms 11 in 31.5 in Various sizes 10 in (80 cm) 4.7 in (12 cm) Long, thin arms (25 cm) (28 cm) 6 arms, 2.4 in(6 cm) Sand Dollar Sea Cucumbers Urchins note signs of balding Eccentric Sand Dollar California Sea Cucumber Warty Sea Cucumber Purple Urchins Red Urchins Dendraster excentricus Parastichopus californicus Parastichopus parvimensis Strongylocentrotus Strongylocentrotus purpuratus franciscanus

has small 4 in 7in black tipped warts (10 cm) (17 cm) 4 in (10 cm) 16 in (40 cm) 10 in (25 cm) long (projections)

Mollusks – soft invertebrates with a shell or remnant shell (single, spiraled shelled invertebrate) Turban Periwinkle Snail Kellet’s Snail Dog Whelk Snail Unicorn Whelk Snail Scaly Tube Snail Tegula spp. Littorina spp. kelletii (Dogwinkles) Acanthinucella spp. Serpulorbis squamigerus Nucella spp.

Top view 6 ½ in 2 in 1.6 in (16.5 cm) (5 cm) 1 in (2.5 cm) ½ in (1.5 cm) (4cm) 5 in (13 cm) Bi-Valves (2 shelled invertebrates) California Olympia Rock Haliotis spp. Mytilus californianus Mytilus trossulus/galloprovincialis gigas Crassedoma gigantea native invasive 6 in (15 cm)

3 in 10 in note observations 5 in (13 cm) (7.6 cm) 12 in (30.5 cm) (25 cm) 4 ½ in (11 cm) 6 in (15 cm) of dead abalone Giant Keyhole Rough Limpet Volcano Limpet Lottia spp. Limpets Octopus spp. Megathura crenulata Macklintockia scabra Fissurella volcano  Juvenile

 Adult 1.6 in 1.4 in 1-3 in 10 in (25 cm) (40 mm) (3.5 cm) (3-8 cm) < 15ft (< 5 m) Nudibranchs Sea Hare California Aglaja California Blue Dorid Spanish Shawl Hopkin’s Rose Phidiana hiltoni Aplysia spp. Navanax inermis Felimare californiensis Flabellina iodine Okenia rosacea

16 in (40 cm) 8.7 in (22 cm) 3.5 in (90 mm) 3.1 in (8 cm) 1.1 in (3 cm) 19.7 in (50 cm) This document was prepared in 2016 by the Aquarium of the Pacific (AOP) for educational purposes only, not for sale. Snapshot CAL Coast’s “Most Wanted ” The original source is hyperlinked to each image in the digital version of this document. Organism comes in a variety of colors

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Southern California Tidepool Organisms Arthropods – invertebrates with jointed limbs & an exoskeleton Barnacles Common Acorn Gooseneck Barnacle Little Brown Barnacle Red Thatched Barnacle White -Ribbed Red Barnacle Pollicipes polymerus Chthamalus dalli Tetraclita rubescens Barnacle Balanus glandula Megabalanus californicus

Diameter Diameter Diameter Diameter

¾ in (1.8 cm) ¼ in (6 mm) 2 in (5.1 cm) 2.4 in (6 cm)

High High High High High 0.4 in (1 cm) 3 in (10 cm) 0.1 in (4 mm) 2 in (5.1 cm) 2 in (5.1 cm)

Crabs Lobsters

Hermit Crab Kelp Crab Masking (Decorator) Crab Striped Shore Crab Pagurus spp. Pugettia spp. Loxorhynchus crispatus Pachygrapsus crassipes Panulirus interruptus

12 in 3.5 in 1 ½ in 1 ½ in 1 ½ in (30 cm) (4 cm) (4 cm) (8.8 cm) (4 cm) note observations of molts Shrimp Isopods Broken back Shrimp Ghost Shrimp Grass Shrimp Kelp Isopods Rock Lice Isopods Scavenging Isopod Heptacarpus spp. Callianassa spp. Penaeus monodon Idotea wosnesenskii Ligia occidentalis Cirolana harfordi

1.6 in 1 in ¾ in 2 ½ in (6.4 cm) 5 in (12.5 cm) 12 in (30 cm) (40 mm) (2.5 cm) (2 cm) Annelids – segmented worms Chordates – animals with a backbone Sand-Castle Tube Worm Spiral Tube Worm Kelp Fish Opaleye Fish Wooly Sculpin Fish Phragmatopoma californica Spirorbis spp. Heterosticbus spp. Girella nigricans Clinocottus analis Adult  24 in 26in (66cm) 2.4 in (61cm) 7in Juvenile  (18cm) (6 cm) Non-Animals Phaeophytes – Brown Algae Feather Boa Kelp Giant Kelp Laminaria Pod-weed Spindled Rockweed Rockweeds Egregia menziesii Laminaria spp. Halidrys siliquosa Pelvetia fastigiata Fucus gardneri

on protected rocks Devil Weed Japanese Wireweed Sea Cabbage Kelp Sea Palm Wakame Sargassum horneri Sargassum muticum Saccharina sessilis Postelsia Undaria pinnatifida palmaeformis

23.6 in (60 cm tall) Stipe-less on unprotected rocks Chlororophytes – Green Algae Rhodophytes – Red Algae Caulerpa Sea Lettuce Dead Man’s Encrusting Red Comb Weed Tidepool Coralline Tar Spot Algae Caulerpa Ulva spp. Fingers Coralline Algae Plocamium cartilagineum Corallina spp. Mastocarpus papillatus taxifolia Codium Lithothamnion spp. fragile

can be red or brown in color Anthophytes – Flowering Plants Porifera – Sponges Pickleweed Eel-Grass Surf-Grass Orange Encrusting Sponge Purple Encrusting Sponge Red Encrusting Sponge Salicornia Zostera spp Phyllospadix spp. Haliclona permollis Ophlitaspongia spp. virginica Long, Long, Flat blades Wiry blades Grows in Mud Grows on Rocks Red – Orange, Soft texture Red –Yellow, velvety texture This document was prepared in 2016 by the Aquarium of the Pacific (AOP) for educational purposes only, not for sale. Snapshot CAL Coast’s “Most Wanted Species” The original source is hyperlinked to each image in the digital version of this document. Organism comes in a variety of colors

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