Pacific Northwest Marine Life
| Bubble, White | Haminoea vesicula |
| Chiton, Gould’s Baby | Lepidochitona dentiens |
| Chiton, Hartweg’s | Lepidochitona hartwegii |
| Chiton, Keep's | Lepidochitona keepiana |
| Cowrie, Chestnut | Zonaria spadicea |
| Dogwinkle, Frilled | Nucella lamellosa |
| Ear Shell, Stearn’s | Marsenina stearnsii |
| Isopod, Stubby (Oregon Pill Bug) | Gnorimosphaeroma oregonense |
| Unicorn, Angular | Acanthina spirata |
| Abalone, Black | Haliotis cracherodii |
| Abalone, Green | Haliotis fulgens |
| Abalone, Northern | Haliotis kamtschatkana |
| Abalone, Red | Haliotis rufescens |
| Aeolid, Three Lined | Flabellina trilineata |
| Amphissa, Variegated | Amphissa versicolor |
| Amphissa, Wrinkled | Amphissa columbiana |
| Anemone, Aggregating | Anthopleura elegantissima |
| Anemone, Brooding | Epiactis lisbethae |
| Anemone, Giant Green | Anthopleura xanthogrammica |
| Anemone, Giant Plumose | Metridium farcimen |
| Anemone, Incubating | Aulactinia incubans |
| Anemone, Moonglow | Anthopleura artemisia |
| Anemone, Orange-striped | Haliplanella lineata (Formerly H. luciae) |
| Anemone, Painted | Urticina felina |
| Anemone, Proliferating | Epiactis prolifera |
| Anemone, Red-beaded | Urticina coriacea |
| Anemone, Short Plumose | Metridium senile |
| Anemone, Solitary Green (Sunburst Anemone) | Anthopleura sola |
| Anemone, Strawberry | Corynactis californica |
| Anemone, Ten-tentacled | Halcampa decemtentaculata |
| Anemone, Velvety Red | Urticina piscivora |
| Anemone, White-spotted | Urticina lofotensis |
| Ascidian, Harbour Star | Botryllus schlosseri |
| Bamboo-Worm, Red-banded | Axiothella rubrocincta |
| Barnacle, Acorn | Balanus glandula |
| Barnacle, Crenate | Balanus crenatus |
| Barnacle, Giant | Balanus nubilus |
| Barnacle, Goose | Pollicipes polymerus |
| Barnacle, Hydrocoral | Solidobalanus engbergi |
| Barnacle, Little Brown | Chthamalus dalli |
| Barnacle, Northern Rock | Semibalanus balanoides |
| Barnacle, Pelagic Goose | Lepas anatifera |
| Barnacle, Red Thatched | Tetraclita rubescens |
| Barnacle, Red-striped Acorn | Balanus pacificus |
| Barnacle, Thatched | Semibalanus cariosus |
| Barnacle, White-ribbed Red | Megabalanus californicus |
| Beach Hopper, Blue | Megalorchestia columbiana |
| Beach Hopper, California | Megalorchestia californiana |
| Beach Hopper, Pink | Maera danae |
| Beach Hopper, Splash-zone | Traskorchestia traskiana |
| Bittium, Threaded | Stylidium eschrichtii |
| Blind Limpet, Ringed | Cryptobranchia concentrica |
| Bloodworm | Euzonus sp. |
| Brittle Star, Banded | Ophionereis annulata |
| Brittle Star, Black and White | Amphipholis pugetana |
| Brittle Star, Burrowing | Amphiodia periercta |
| Brittle Star, Daisy | Ophiopholis aculeata |
| Brittle Star, Dwarf | Amphipholis squamata |
| Brittle Star, Flat-spined | Ophiopteris papillosa |
| Brittle Star, Long-armed | Amphiodia occidentalis |
| Brittle Star, Panamanian | Ophioderma panamense |
| Brittle Star, Smooth | Ophioplocus esmarki |
| Brittle Star, Western Spiny | Ophiothrix spiculata |
| Bryozoan, Branched-spine | Flustrellidra corniculata |
| Bryozoan, Derby Hat | Eurystomella bilabiata |
| Bryozoan, Kelp Encrusting | Membranipora membranacea |
| Bryozoan, Northern Staghorn | Heteropora pacifica |
| Bryozoan, Orange Encrusting | Schizoporella unicornis |
| Bryozoan, Sea-lichen | Dendrobeania lichenoides |
| Bubble, California | Bulla gouldiana |
| Bubble, Green | Haminoea virescens |
| Button Snail, Reticulate | Trimusculus reticulatus |
| By-the-wind Sailor | Velella velella |
| Cadlina, Yellow Spotted | Cadlina flavomaculata |
| Chiton, Black Katy | Katharina tunicata |
| Chiton, Blue-line | Tonicella undocaerulea |
| Chiton, California Spiny | Nuttallina californica |
| Chiton, Conspicuous | Stenoplax conspicua |
| Chiton, Cooper’s | Lepidozona cooperi |
| Chiton, Cryptic Spiny | Nuttallina sp. Nov. |
| Chiton, Dwarf | Leptochiton rugatus |
| Chiton, Gem | Chaetopleura gemma |
| Chiton, Giant Pacific | Cryptochiton stelleri |
| Chiton, Heath’s | Stenoplax heathiana |
| Chiton, Lined | Tonicella lineata |
| Chiton, Loki’s | Tonicella lokii |
| Chiton, Merten’s | Lepidozona mertensii |
| Chiton, Mossy | Mopalia muscosa |
| Chiton, Northern Hairy | Mopalia kennerleyi |
| Chiton, Regular | Lepidozona regularis |
| Chiton, Southern Spiny | Nuttallina scabra |
| Chiton, Three-rib | Lepidozona trifida |
| Chiton, White-line | Tonicella insignis |
| Chiton, Woody | Mopalia lignosa |
| Clam, Bean | Donax gouldii |
| Clam, Butter | Saxidomus gigantea |
| Clam, California Sunset | Gari californica |
| Clam, Little Heart | Glans carpenteri |
| Clam, Mud Shrimp | Pseudopythina rugifera = Neaeromya rugifera? |
| Clam, Pismo | Tivela stultorum |
| Clam, Rose-painted | Semele rubropicta |
| Clingfish, Northern | Gobiesox maeandricus |
| Cockle, Nuttall’s | Clinocardium nuttallii |
| Cockscomb, High | Anoplarchus purpurescens |
| Cone, California | Conus californicus |
| Crab, Black-clawed | Lophopanopeus bellus |
| Crab, Cabrillo's Porcelain | Petrolisthes cabrilloi |
| Crab, Chocolate Porcelain | Petrolisthes manimaculis |
| Crab, Cryptic Kelp | Pugettia richii |
| Crab, Dungeness | Cancer magister |
| Crab, Dwarf Teardrop | Pelia tumida |
| Crab, European Green | Carcinus maenas |
| Crab, Flat Porcelain | Petrolisthes cinctipes |
| Crab, Flattop | Petrolisthes eriomerus |
| Crab, Foliate Kelp | Mimulus foliatus |
| Crab, Furry | Hapalogaster cavicauda |
| Crab, Gaper Pea | Pinnixa littoralis |
| Crab, Globose Kelp | Taliepus nuttallii |
| Crab, Graceful | Cancer gracilis |
| Crab, Graceful Decorator | Oregonia gracilis |
| Crab, Graceful Kelp | Pugettia gracilis |
| Crab, Granular Claw | Oedignathus inermis |
| Crab, Green Shore | Hemigrapsus oregonensis |
| Crab, Hairy | Hapalogaster mertensii |
| Crab, Helmet | Telmessus cheiragonus |
| Crab, Pacific Mole | Emerita analoga |
| Crab, Purple Shore | Hemigrapsus nudus |
| Crab, Pygmy Rock | Cancer oregonensis |
| Crab, Red Rock | Cancer productus |
| Crab, Shield-backed Kelp | Pugettia producta |
| Crab, Spot-bellied Rock | Cancer antennarius |
| Crab, Striped Shore | Pachygrapsus crassipes |
| Crab, Thick-clawed Porcelain | Pachycheles rudis |
| Crab, Umbrella | Cryptolithodes sitchensis |
| Cup Coral, Orange | Balanophyllia elegans |
| Cup-and-saucer, Spiny | Crucibulum spinosum |
| Datemussel, California | Adula californiensis |
| Dendrochiton, Painted | Dendrochiton flectens |
| Dendronotid, White | Dendronotus albus |
| Dogwinkle, Channelled | Nucella canaliculata |
| Dogwinkle, Northern Striped | Nucella ostrina |
| Dorid, Barnacle-eating | Onchidoris bilamellata |
| Dorid, Cockerell’s | Limacia cockerelli formerly Laila cockerelli |
| Dorid, Monterey | Doris montereyensis formerly Archidoris montereyensis |
| Dorid, White Knight | Archidoris odhneri |
| Dovesnail, Carinate | Alia carinata = Mitrella carinata |
| Drill, Knobbed | Pseudomelatoma torosa |
| Dwarf-turban, Dark | Homalopoma luridum |
| Eggcockle, Pacific | Laevicardium substriatum |
| Entodesma, Rock | Entodesma navicula |
| Erato, Appleseed | Hespererato vitellina |
| Erato, Pigeon | Hespererato columbella |
| False-jingle, Green | Pododesmus macroschisma |
| Fiddler, Mexican | Uca crenulata |
| Filament-worm, Fringed | Dodecaceria fewkesi |
| Fileclam, Hemphill | Limaria hemphilli |
| Fireworm, California | Pareurythoe californica |
| Flatworm, Long Speckled | Enchiridium punctatum |
| Flatworm, Oval | Pseudoalloioplana californica |
| Flatworm, Saddleback | Notoplana sanguinea - formerly Notocomplana sanguinea |
| Flatworm, Tapered | Notocomplana acticola |
| Gaper, Fat | Tresus capax |
| Gaper, Pacific | Tresus nuttallii |
| Geoduck, Pacific | Panope abrupta |
| Goby, Blind | Typhlogobius californiensis |
| Gunnel, Crescent | Pholis laeta |
| Gunnel, Saddleback | Pholis ornata |
| Hairysnail, Cancellate | Trichotropis cancellata |
| Half-slippersnail, Pacific | Crepipatella dorsata |
| Hermit, Bering | Pagurus beringanus |
| Hermit, Blueband | Pagurus samuelis |
| Hermit, Gold Ring | Pagurus hemphilli |
| Hermit, Grainyhand | Pagurus granosimanus |
| Hermit, Greenmark | Pagurus caurinus |
| Hermit, Hairy | Pagurus hirsutiusculus |
| Hermit, Moonsnail | Isocheles pilosus |
| Hiatella, Arctic | Hiatella arctica |
| Hoofsnail, Flat | Hipponix cranioides |
| Hornmouth, Leafy | Ceratostoma foliatum |
| Hornmouth, Nuttall's | Ceratostoma nuttalli |
| Hornsnail, California | Cerithidea californica |
| Horsemussel, Northern | Modiolus modiolus |
| Horsemussel, Straight | Modiolus rectus |
| Hydrocoral, Purple Encrusting | Stylantheca spp. Formerly Allopora sp. |
| Hydroid, Clam | Clytia bakeri |
| Hydroid, Ostrich-plume | Aglaophenia spp. |
| Hydroid, Solitary Pink-mouth | Ectopleura marina |
| Hydroid, Turgid Garland | Sertularella turgida |
| Hydroid, Wine-glass | Obelia sp. |
| Innkeeper Worm, Fat | Urechis caupo |
| Isopod, Blunt-tailed | Idotea urotoma |
| Isopod, Monterey | Idotea montereyensis |
| Isopod, Pencil | Idotea fewkesi |
| Isopod, Scavenging | Cirolana harfordi |
| Isopod, Surfgrass | Idotea kirchanskii |
| Isopod, Vosnesensky’s | Idotea wosnesenskii |
| Jackknife-clam, Rosy | Solen rostriformis |
| Jackknife-clam, Sickle | Solen sicarius |
| Jelly, Aggregating | Eutonina indicans |
| Jelly, Atlantic Moon | Aurelia aurita |
| Jelly, Cross | Mitrocoma cellularia |
| Jelly, Lion's Mane | Cyanea capillata |
| Jelly, Pacific Moon | Aurelia labiata |
| Jelly, Purple | Pelagia noctiluca |
| Jelly, Purple-striped | Pelagia colorata |
| Jelly, Water | Aequorea sp. |
| Jewelbox, Pacific Left-handed | Pseudochama exogyra |
| Jewelbox, Secret | Chama arcana |
| Jingle, Pearly | Anomia peruviana |
| Kellyclam | Kellia suborbicularis |
| Keyhole Limpet, Giant | Megathura crenulata |
| Keyhole Limpet, Rough | Diodora aspera |
| Keyhole Limpet, Two-spot | Fissurellidea bimaculata |
| Keyhole Limpet, Volcano | Fissurella volcano |
| Lacuna, Wide | Lacuna vincta |
| Lamellaria, San Diego | Lamellaria diegoensis |
| Lampshell, Common | Terebratalia transversa |
| Leather Limpet | Onchidella borealis |
| Leather, White Glove | Didemnum albidum |
| Lepidozona, Pectinate | Lepidozona pectinulata |
| Lepidozona, Smooth | Lepidozona interstincta |
| Limpet, Black | Lottia asmi |
| Limpet, Fenestrate | Lottia fenestrata |
| Limpet, File | Lottia limatula |
| Limpet, Giant Owl | Lottia gigantea |
| Limpet, Mask | Lottia persona |
| Limpet, Pacific Plate | Lottia scutum |
| Limpet, Ribbed | Lottia digitalis |
| Limpet, Rough | Lottia scabra |
| Limpet, Seaweed | Discurria insessa |
| Limpet, Shield | Lottia pelta |
| Limpet, Unstable | Lottia instabilis |
| Limpet, Whitecap | Acmaea mitra |
| Littleneck, Japanese | Venerupis philippinarum |
| Littleneck, Pacific | Protothaca staminea |
| Littleneck, Rough-sided | Protothaca laciniata |
| Lobster, California Spiny | Panulirus interruptus |
| Lucine, California | Epilucina californica |
| Lugworm, Pacific | Abarenicola pacifica |
| Lyonsia, California | Lyonsia californica |
| Macoma, Baltic | Macoma balthica |
| Macoma, Bent-nose | Macoma nasuta |
| Macoma, Expanded | Macoma expansa |
| Macoma, Indented | Macoma indentata |
| Macoma, White-sand | Macoma secta |
| Macron, Livid | Macron lividus |
| Mahogany-clam, California | Nuttallia nuttallii |
| Mahogany-clam, Purple | Nuttallia obscurata |
| Margarite, Puppet | Margarites pupillus |
| Marginella, Banded California | Volvarina taeniolata |
| Midshipman, Plainfin | Porichthys notatus |
| Mite, Red Velvet | Neomolgus littoralis |
| Miter, Ida's | Mitra idae |
| Moonsnail, Lewis's | Euspira lewisii |
| Moonsnail, Southern | Neverita reclusiana |
| Mopalia, Hind’s | Mopalia hindsii |
| Mopalia, Long-haired | Mopalia cirrata |
| Mopalia, Red-flecked | Mopalia spectabilis |
| Mopalia, Swan’s | Mopalia swanii |
| Murex, Festive | Pteropurpura festiva |
| Murex, Gem | Maxwellia gemma |
| Murex, Three-wing | Pteropurpura trialata |
| Mussel, Blue | Mytilus edulis |
| Mussel, California | Mytilus californianus |
| Mussel, Pacific Blue | Mytilus trossulus |
| Mussel, Ribbed | Geukensia demissa |
| Nassa, Giant Western | Nassarius fossatus |
| Nassa, Japanese | Nassarius fraterculus |
| Nassa, Western Fat Dog | Nassarius perpinguis |
| Nassa, Western Lean | Nassarius mendicus |
| Nudibranch, Bushy-backed | Dendronotus frondosus |
| Nudibranch, Cryptic | Doridella steinbergae |
| Nudibranch, Frosted | Dirona albolineata |
| Nudibranch, Hooded | Melibe leonina |
| Nudibranch, Opalescent | Hermissenda crassicornis |
| Nudibranch, Orange-spotted | Triopha catalinae |
| Nudibranch, Painted | Dirona picta |
| Nudibranch, Red | Rostanga pulchra |
| Nudibranch, Ringed | Diaulula sandiegensis |
| Nudibranch, Rufus Tipped | Acanthodoris nanaimoensis |
| Nudibranch, Shag-rug | Aeolidia papillosa |
| Nudibranch, Yellow-edged | Cadlina luteomarginata |
| Octopus, Giant Pacific | Enteroctopus dofleini formerly Octopus dofleini |
| Olive, Baetic | Olivella baetica |
| Olive, Purple | Olivella biplicata |
| Olive, Zigzag | Olivella pycna |
| Oyster Drill, Atlantic | Urosalpinx cinerea |
| Oyster, Atlantic | Crassostrea virginica |
| Oyster, Olympia | Ostrea conchaphila |
| Oyster, Pacific | Crassostrea gigas |
| Pandora, Punctate | Pandora punctata |
| Peanut Worm, Agassiz’s | Phascolosoma agassizii |
| Peanut Worm, Bushy-headed | Themiste pyroides |
| Periwinkle, Checkered | Littorina scutulata |
| Periwinkle, Flat-bottomed | Littorina keenae |
| Periwinkle, Salt Marsh | Algamorda subrotunda |
| Periwinkle, Sitka | Littorina sitkana |
| Piddock, Beaked | Netastoma rostratum |
| Piddock, Flat-tip | Penitella penita |
| Piddock, Rough | Zirfaea pilsbryi |
| Piddock, Scale-sided | Parapholas californica |
| Prickleback, Black | Xiphister atropurpureus |
| Prickleback, Rock | Xiphister mucosus |
| Puncturella, Hooded | Cranopsis cucullata |
| Razor-clam, Pacific | Siliqua patula |
| Retiring Southerner | Pilumnus spinohirsutus |
| Ribbon Worm, Green | Emplectonema gracile |
| Ribbon Worm, Orange | Tubulanus polymorphus |
| Ribbon Worm, Pink-fronted | Amphiporus imparispinosus |
| Ribbon Worm, Purple-backed | Paranemertes peregrina |
| Ribbon Worm, Rose | Cerebratulus montgomeryi |
| Ribbon Worm, Six-lined | Tubulanus sexlineatus |
| Ribbon Worm, Two-spotted (Chevron) | Amphiporus bimaculatus |
| Ribbon Worm, Velvet | Lineus pictifrons |
| Ribbon Worm,Pink | Procephalothrix major |
| Rock Snail, Poulson’s | Roperia poulsoni |
| Rocksnail, Circled | Ocenebra circumtexta |
| Rocksnail, Lurid | Ocinebrina lurida |
| Rocksnail, Purple | Ocenebra atropurpurea |
| Rocksnail, Sculpured | Ocinebrina interfossa |
| Rose, Hopkin’s | Okenia rosacea formerly Hopkinsia rosacea |
| Sand Dollar, Eccentric | Dendraster excentricus |
| Scaled Crab | Placetron wosnessenskii |
| Scaleworm, Depressed | Eunoe depressa |
| Scaleworm, Fifteen-paired | Harmothoe imbricata |
| Scaleworm, Fragile | Arctonoe fragilis |
| Scaleworm, Red Commensal | Arctonoe pulchra |
| Scaleworm, Red-banded Commensal | Arctonoe vittata |
| Scaleworm, White-banded | Gaudichaudius iphionelloides |
| Scallop, Giant Rock | Crassadoma gigantea |
| Scallop, Kelp | Leptopecten latiauratus |
| Scallop, Pacific Calico | Argopecten ventricosus |
| Scallop, San Diego | Euvola diegensis |
| Scallop, Smooth Pink | Chlamys rubida |
| Scallop, Spiny Pink | Chlamys hastata |
| Scallop, Weathervane | Patinopecten caurinus |
| Sculpin, Tidepool | Oligocottus maculosus |
| Sea Cucumber, Black | Pseudocnus curatus |
| Sea Cucumber, California | Parastichopus californicus |
| Sea Cucumber, Creeping Pedal | Psolus chitonoides |
| Sea Cucumber, Orange | Cucumaria miniata |
| Sea Cucumber, Stiff-footed | Eupentacta quinquesemita |
| Sea Cucumber, Warty | Parastichopus parvimensis |
| Sea Goddess, White Spotted | Doriopsilla albopunctata |
| Sea Goddess, Yellow-gilled | Doriopsilla gemela |
| Sea Gooseberry | Pleurobrachia bachei |
| Sea Hare, California | Aplysia californica |
| Sea Hare, California Black | Aplysia vaccaria |
| Sea Lemon | Peltodoris nobilis formerly Anisodoris nobilis |
| Sea Mouse, Copper-haired | Aphrodita japonica |
| Sea Nettle | Chrysaora fuscescens |
| Sea Pork, California | Aplidium californicum |
| Sea Pork, Red | Aplidium solidum |
| Sea Roach, Western | Ligia occidentalis |
| Sea Squirt, Brooding Transparent | Corella inflata |
| Sea Squirt, Shiny Red | Cnemidocarpa finmarkiensis |
| Sea Squirt, Spiny-headed | Boltenia villosa |
| Sea Squirt, Stalked | Styela montereyensis |
| Sea Squirt, Warty | Pyura haustor |
| Sea Urchin, Green | Strongylocentrotus droebachiensis |
| Sea Urchin, Purple | Strongylocentrotus purpuratus |
| Sea Urchin, Red | Strongylocentrotus franciscanus |
| Semele, Clipped | Semele decisa |
| Semele, Rock | Semele rupicola |
| Shark, Swell (Egg Case) | Cephaloscyllium ventriosum |
| Shawl, Spanish | Flabellina iodinea |
| Shipworm, Feathery | Bankia setacea |
| Shrimp, Bay Ghost | Neotrypaea californiensis |
| Shrimp, Blue Mud | Upogebia pugettensis |
| Shrimp, Red Rock | Lysmata californica |
| Shrimp, Sitka | Heptacarpus sitchensis |
| Shrimp, Smalleyed | Heptacarpus carinatus |
| Shrimp, Smooth Bay | Lissocrangon stylirostris |
| Shrimp, Stout | Heptacarpus brevirostris |
| Skate, Big (Egg Case) | Raja binoculata |
| Skate, Starry (Egg Case) | Raja stellulata |
| Skeleton Shrimp | Caprella sp. |
| Slater, Sea | Ligia pallasii |
| Slippersnail, Hooked | Crepidula adunca |
| Slippersnail, Northern White | Crepidula nummaria |
| Slippersnail, Onyx | Crepidula onyx |
| Snail, Eastern Mud | Ilyanassa obsoleta |
| Snail, Mudflat | Batillaria attramentaria |
| Snailfish, Tidepool | Liparis florae |
| Soft Coral, Aggregating | Alcyonium rudyi |
| Softshell-clam | Mya arenaria |
| Softshell-clam, Boring | Platyodon cancellatus |
| Softshell-clam, California | Cryptomya californica |
| Softshell-clam, Truncated | Mya truncata |
| Spagetti-worm, Coarse-tubed Pink | Thelepus crispus |
| Spaghetti-worm, Brown Intertidal | Eupolymnia heterobranchia |
| Spindle, Painted | Fusinus luteopictus |
| Sponge, Bread Crumb | Halichondria panicea |
| Sponge, Cobalt | Hymenamphiastra cyanocrypta |
| Sponge, Mucus | Plocamia karykina |
| Sponge, Orange Finger | Neoesperiopsis rigida |
| Sponge, Purple Encrusting | Haliclona permollis |
| Sponge, Red Encrusting | Ophlitaspongia pennata |
| Sponge, Yellow Boring | Cliona celata |
| Stalked Jelly, Oval-anchored | Haliclystus stejnegeri |
| Star, Bat | Asterina miniata |
| Star, Colourful Six-rayed | Leptasterias aequalis (species complex) |
| Star, Drab Six-rayed | Leptasterias hexactis (species complex) |
| Star, Giant Pink | Pisaster brevispinus |
| Star, Giant Spined | Pisaster giganteus |
| Star, Leather | Dermasterias imbricata |
| Star, Mottled | Evasterias troschelii |
| Star, Pacific Blood | Henricia leviuscula |
| Star, Painted | Orthasterias koehleri |
| Star, Purple | Pisaster ochraceus |
| Star, Sunflower | Pycnopodia helianthoides |
| Star, Vermilion | Mediaster aequalis |
| Sun Star, Morning | Solaster dawsoni |
| Sun Star, Striped | Solaster stimpsoni |
| Surfclam, Hemphill | Mactromeris hemphillii |
| Surfclam, Hooked | Simomactra falcata |
| Tagelus, California | Tagelus californianus |
| Tellin, Bodega | Tellina bodegensis |
| Topsnail, Blue | Calliostoma ligatum |
| Topsnail, Purple-ring | Calliostoma annulatum |
| Topsnail, Tucked | Lirularia succincta |
| Triopha, Spotted | Triopha maculata |
| Triton, Oregon | Fusitriton oregonensis |
| Tube Snail, Scaly | Serpulorbis squamigerus |
| Tubeworm, Basket-top | Pista elongata |
| Tubeworm, Dwarf Calcareous | Pileolaria sp. |
| Tubeworm, Red-trumpet Calcareous | Serpula columbiana |
| Tubeworm, Spiral | Spirorbis sp. |
| Tunicate, Lightbulb | Clavelina huntsmani |
| Tunicate, Mushroom | Distaplia occidentalis |
| Tunicate, Orange Chain | Botrylloides diegensis |
| Tunicate, Orange Sheath | Botrylloides violacaus |
| Tunicate, Spotted | Eudistoma molle / Archidistoma molle |
| Tunicate, Stalked Compound | Distaplia smithi |
| Tunicate, Taylor’s Social | Metandrocarpa taylori |
| Tunicate, Yellow Lobbed | Eudistoma ritteri |
| Turban, Banded | Tegula eiseni |
| Turban, Black | Tegula funebralis |
| Turban, Brown | Tegula brunnea |
| Turban, Dusky | Tegula pulligo |
| Turban, Gilded | Tegula aureotincta |
| Turban, Red | Lithopoma gibberosa |
| Turban, Smooth Brown | Norrisia norrisi |
| Turban, Speckled | Tegula gallina |
| Turban, Wavy | Megastraea undosa |
| Unicorn, Checkered | Acanthina paucilirata |
| Unicorn, Spotted | Acanthina punctulata |
| Veiled-chiton | Placiphorella velata |
| Veiled-chiton, Red | Placiphorella rufa |
| Velvet Snail, Spiral | Velutina velutina |
| Velvet Snail, Wavy | Velutina undata |
| Venus, Banded | Chione californiensis |
| Venus, Rock | Irusella lamellifera |
| Venus, Smooth | Chione fluctifraga |
| Venus, Wavy | Chione undatella |
| Venus, White | Amiantis callosa |
| Warbonnet, Mosshead | Chirolophis nugator |
| Wentletrap, Boreal | Opalia borealis |
| Wentletrap, Scallop-edged | Opalia funiculata |
| Wentletrap, Tinted | Nitidiscala tincta |
| Whelk, Dire | Lirabuccinum dirum |
| Whelk, Kellet’s | Kelletia kelletii |
| Worm, Bat Star | Ophiodromus pugettensis |
| Worm, Giant Pile | Nereis brandti |
| Worm, Honeycomb | Sabellaria cementarium |
| Worm, Large Leaf | Kaburakia excelsa |
| Worm, Northern Feather-duster | Eudistylia vancouveri |
| Worm, Pile | Nereis vexillosa |
| Worm, Porcupine | Euphrosine sp. |
| Worm, Proboscis | Glycera sp. |
| Worm, Sand-castle | Phragmatopoma californica |
| Worm, Sheathed Bristle-cage | Flabelligera affinis |
| Worm, Shell-binding Colonial | Chone minuta |
| Worm, Shimmy (Sandworm) | Nephtys sp. |
| Worm, Spiny Christmas-tree | Spirobranchus spinosus |
| Worm, Tufted Proboscis | Glycera americana |