Nudibranchs, Chitons, Octopus

White Nudibranch

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White Nudibranch, giant white dorid, snow white dorid
Doris odhneri

Size: to 20 cm (8 inches) long
Range: Alaska to California
Habitat: Intertidal to 50 m (165 ft)
Comments: The white nudibranch typically has a circular, flower-shaped gill protruding from near the rear of an oval body.  There are no dark markings on this nudibranch.



Frosted White Nudibranch

White-Lined Dirona, Frosted White Nudibranch
Frosted White Nudibranch
White-Lined Dirona
Frosted White Nudibranch

 
Frosted White Nudibranch
Dirona albolineata 
Alternate Names: Alabaster nudibranch, chalk-line dirona
Size: to 7″ inches (17.5 cm)
Range: Kachemak Bay, Alska to San Diego, California
Habitat: On the rocks and occasionally on mud, intertidal to 115′ feet (35m)
Description: Grey, white to purple translucent body with lines, large, flattened, pointed cerata.  Eggs are coiled.
Comments: Species feeds on stalked bryozoans, snails (it cracks the shell with its jaws) and other organisms.  It is also found in Russia and Japan.



Golden Dirona

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Golden Dirona

Golden Dirona
Dirona pellucida
Size: to 12 cm (5in) long
Range: Alaska to Oregon
Habitat: intertidal to subtidal
Comments: White specking, particularly on the lower body, distinguishes the golden dirona from the orange varieties of the frosted nudibranch.  The spectacular leaf-shaped structures along its back are sites where the oxygen/carbon dioxide exchange occurs.  Note that the shape and number of these leafy structures is quite variable.


Giant Dendronotid

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Giant Dendronotid
Dendronotus iris
Size: To 10″ (25cm)
Range: Unalaska Island to Baja California
Habitat: In sand-mud, shallow subtidal to 655′ (200m)
Description: Large, with long branched processes on back frontal veil of 4 spired appendages. Color varies from white to grey, orange to red. A white line runs along foot margin
Comments: Species feeds on the tenticals of tube dwelling anemones. Often lays loosely looped eggs on the tube and sometimes pulled into it. The animal can swim if disturbed.



Opalescent Nudibranch

Opalescent Nudibranch
Opalescent Nudibranch

Opalescent Nudibranch
Hermissenda crassicomis
Size: Up to 3″ inches long
Range: Japan to Baja California
Habitat: Lives on eelgrass beds, rocks, mud flats, docks (Intertidal to 115ft deep)
Description: Opalescent Nudibranch has a mid-line orange patch on its translucent back. It is slender and small in stature and its without shell or operculum.  It also lacks a mantle cavity and is covered in many cerata topped with orange and white tips.
Comments: Nudibranchs feed on hydroids, sponges, sea slug eggs or sea sluggs, sea squirts, pieces of fish, other mollusks and sometimes anemones and barnacles.  All are carnivorous and feed on a wide variety of animals.


Red-Gilled Nudibranch

Red-Gilled Nudibranch, Porteau Cove
Red-Gilled Nudibranch, Porteau Cove
Red-Gilled Nudibranch, Porteau Cove
Red-Gilled Nudibranch, Porteau Cove

Red-Gilled Nudibranch
Flabellina verrucosa
Common Name: Red-gilled aeolid, red verrucose nudibranch, verrucose aeolid, red-fingered eolis
Size: to 10cm (4 in) long
Range: Britian, Norway, Iceland, Greenland, to Maine, Sea of Japan, Alaska to Washington State.
Habitat: Intertidal to 300m (1,000ft)
Description: Spawning on as well as consuming, a variety of hydroids, particularly the pink mouth hydroids.
Comments: The lovely nudibranch, Flabellina amabilis, nearly identical to this one, has so far only been found at the north end of Vancouver Island, BC., and the Sea of Japan. It lives with the brown bushy hydroid.


Flabellina Verrucosa

Flabellina verrucosa
Flabellina verrucosa
Flabellina Verrucosa
Flabellina Verrucosa

Flabellina Verrucosa
Flabellinidae
Size: Up to 25mm long
Range: Boreo-arcitc from southern New England, USA in the west Atlantic to the British Isles in Europe.  Also in North Pacific to the Sea of Japan.
Habitat: 
Comments: This Species has a confused taxonomic history with different colour forms and animals from Europe and North America, being considered different species.  It is also very similar in appearance to Flabelinna gracilis.  It feeds on a number of thecate and athecate hydroids, and if food is short has been reported to feed on compound ascidians.

 

 


Bi-colored Nudibranch

Bi-colored Nudibranch
Bi-colored Nudibranch
Bi-colored Nudibranch
Bi-colored Nudibranch

Bi-colored Nudibranch
Janolus fuscus
Typical size: 1-2″ length
ID: Translucent white body.  Densely packed pointed cerata with maroon center and tipped with yellow and white.
Comments: These picturesque nudibranchs are typically found on broadleaf kelp around soft substrates.  Note the orange stipe on this species head.  I regularly find larger specimens at Tuwanek in spring on broadleaf kelp from shallow depths to over 90 feet deep.


Leopard Dorid

Leopard Droid
Leopard Droid

Leopard Dorid
Diaulula sandiegensis
Alternate Names: San Diego dorid, ring-spotted dorid, tar spot nudibranch
Size: to 3″ (7.5 cm)
Range: Unalaska Island, Alaska to Baja California
Habitat: On rocks and sponges, intertidal to 115 ft (35m)
Description: Oval – elongated white body with very fine tubercles, light to dark brown rings, occasionally without spots.
Comments: Species east sponges, bread crumb, purple encrusting.


Yellow Margin Dorid

Yellow Margin Dorid, tanken at Whytecliff Park
Yellow Margin Dorid
White Margin Dorid, taken at Whytecliff Park
White Margin Dorid

Yellow Margin Dorid
Cadlina  luteomarginata
Size: to 13/4 (4.5 cm)
Range: Lynn Canal, Alaska to Point Eugenia, Mexico
Habitat: On rocks and sponges, intertidal to 150′ (45m)
Description: White body with yellow margin; large low tubercles tipped yellow.
Comments: Species feeds on a wide variety of sponges.


Pacific Geoduck Clam

Geoduck, Porteau Cove
Geoduck, Porteau Cove

Pacific Geoduck Clam
Panopea abrupta
Alternate Names: King Clam
Size: to 19.5cm (7 3/4 inch) or more
Range: Kodak Alaska to Newport Bay, California
Habitat: Buried in gravel-sand-mud, lowest intertidal to 100m (330 ft) or more.
Description: Shells are rounded at anterior, truncated at si periostracum phon end, gaping at all sides due to large body and neck.  Species cannot draw siphons or neck into shell.  White shell, then patches at edges.  Both shells have a cardinal tooth at the hinge; this may be broken off by a sea otter.  White interior with continuous pallial line, unlike false Geoduck.
Comments: This is the largest intertidal clam in the world, reaching weights greater than 10 lbs (4.5 kg).  It is among the oldest animals in the world reported to live as long as 146 years.


Giant Pacific Octopus

Diver with a Giant Pacific Octopus
Diver with a Giant Pacific Octopus
Free Swimming Giant Pacific Octopus
Free Swimming Giant Pacific Octopus

 

Giant Pacific Octopus
Octopus dofleini
Size: Mantle to 8′ (20cm)
arm span to 30′ (9m)
Range: Bering Sea to California.
Habitat: On sandy and rocky shores; intertidal to 330′ (100m)
Description: 8 arms of equal length; species changes color from pale to dark reddish brown ot mottled patterns. Large, globular body; head has no fins
Comments:This is the largest octopus in the world, reported to weigh up to 600lbs (272kg). It is also found in Japan. The female guards strings of eggs, attached to the roof of the den.Want to read more about the Pacific Octopus, Click HereUw Explorers are currently conducting an Observational Study of the Giant Pacific Octopus.  To find more, visit  Observational Study (Giant Pacific Octopus)


Pacific Red Octopus

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Red Octopus
Red Octopus
Red Octopus
Red Octopus

Pacific Red Octopus, red octopus
Octopus rebescens

Size: to 50 cm (20inches) are spread, 0.4 kg (1lbs) total weight
Range: Alaska to Mexico
Habitat: Intertidal to 300m (1,000ft)
Comments: Three tiny flaps or “eyelashes” below each eye and its muddy red color distinguish the red octopus from a small specimen of the Giant Pacific Octopus.  Although seldom sufficiently provoked, this animal can deliver a nasty bit, as can the normally docile Giant Pacific Octopus.


Stubby Squid

Stubby Squid
Stubby Squid
Stubby Squid
Stubby Squid
Marine Life of the Pacific Northwest, Stubby Squid
Stubby Squid

Studdy Squidbobtail squid
Rossia pacifica

Size: Mantle Length about 5 cm females, 3 -4 cm for Males. Total length is about  females 11cm, males is about 9cm.
Range: North Pacific, Ryukyu Archipelago Japan, Canada and South to California
Habitat: Intertidal to 300m (1,000ft), fairly common of sand or muddy sand
Comments: Although sepiolids are commonly called squid, they are not true squids.  They look like a combination between octopus and squid but are actually more closely related to cuttlefish.  Like cuttlefish, they can bury themselves in the sand, and like octopuses, they mostly live on the bottom rather than swimming in the water column.  They have eight suckered arms and two long tentacles like squids, but don;t have a quill or cuttlebone for internal body support.  They swim by using the fins on either side of their body, or use jet propulsion by taking water into their body cavity and squirting it our a funnel.


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