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Species index
Species Index
Emerald Diving
Explore the coastal and inland waters of
Washington and BC
Freckled Pale Sea Lemon
Diaulula lentiginosa
Typical size: 6-10” length
ID: Dorid shape.  Large pale yellow body with large dark and light brown patches of varying density. Small to medium sized tubercles cover entire body.  Thick branchial plume on rear.
Image Location:  Lawrence Point, Orcas Island, SJI

Comments:  This is one of the largest nudibranch species in Washington water.  My best luck finding this large sea slug is throughout Hood Canal and the San Juan Island.
Sea Lemon
Peltodoris nobilis
Typical size: 3-8” length
ID: Yellow or pale yellow dorid shaped body.  Branchial plume is white.  Body covered with flat yellow tubercles.  Dark patches on body do not extend to tubercles.
Comments: I note sea lemon dorids more than any other nudibranch in our state.  Sea lemon dorids can grow quite large and be almost as wide as they are long.  The reef on the east side of Blakely Rock is a great place to find large specimens.



Shaggy Mouse Nudibranch
Aeoldia loui
Typical size: 1-3” length
ID: Two distinct rows of dense cerata.  White/crθme colored body, often with purple or grey on top (but not always).  Cerata start in front of rhinophores.
Comments:  I rarely note the well camouflaged shaggy mouse nudibranch. When I do note this species, it is typically on a rock or attached to eel-grass.  I have had my best luck finding this species at KVI Tower Reef in Puget Sound, which is where I found this specimen.

Spotted Aglajid
Aglaja ocelligera

Typical size: 1-2”  length
ID: Elongated, smooth, and rounded dark body with small white and/or yellow spots.
Comments:  I only note the spotted aglajid on soft substrates when broadleaf kelp is present.  The soft substrate above the reef at KVI Tower seems to be a favorite location for this nudibranch, at least during summer months when high concentrations of kelp are present.

White Dendronotid
Dendronotus albus
Typical size: 2-4” length
ID:  Elongated, translucent white body.  Up to seven sets of gill tufts tipped with white and/or orange.  White stripe runs from the fourth pair of gill tufts to the tail.  White or  purple body.
Comments:
A common species, I most often note the white dendronotid clinging to hydroids in the San Juan Island area.  This species used to be differentiate from Dendrontus diversicolour, but recent research has resulted in the convergence of these two species.


Verrucose Aeolid
Flabellina verrucosa
Typical size: 1-2” length
ID:  Red cerata tipped in white arranged in several clumps on either side of the body.  Long smooth rhinophores. 
Comments: 
rarely note this species of nudibranch.  This species looks like a red flabillina with a bad haircut, and long, extended rhinophores.  Diet consists of hydroids and possibly other invertebrates.   


Yellow Dorid
Acanthodoris  lutea
Typical size: 1” length
ID: Bright yellow/orange color, white branchial plume, distinctive brown tipped rhinophores, and light yellow specks.
Comments: Another nudibranch I rarely note, although this species appears to flourish (at least at certain times of the year) at Elephant Wall in Hood Canal, which is where this image was taken.  Reportedly, this nudibranch emits a strong odor that resembles sandalwood.

Striped Nudibranch
Armina californica
Typical size: 3-6”  length
ID: Elongated brown body with horizontal white stripes.  White margin around foot.  Club-like rhinophores.
Comments:  I often note this nudibranch in sandy areas with dense seapen congregations, which just happen to be this nudibranchs favorite food.  I have consistently noted this species on the northern section of the shelf above Possession Point Fingers.  Once the striped nudibranch finds a seapen to devour, it will often dig in the sand to attack the subterranean base of soft coral.

Red Nudibranch
Dendronotus rufus
Typical size: 4-10” length
ID: White elongated body.  Purple to red tipped branching cerata.
Comments:   I rarely note red nudibranchs.  My best luck for sighting this spectacular species is at Possession Point Fingers during summer months where I sometimes find these nudibranchs patrolling the underside of ledges.  The specimen was found in Blakely Harbor  patrolling an old wooden wreck.


Red Flabellina
Himatina trophina based
Typical size: 2-3” length
ID: Dense rows of red and/or pink cerata tipped in white on either side of body.  Relatively short rhinophores have very subtle ridges.
Comments: During certain times of year, I note dense concentrations of red flabellina on soft substrates.  I have encountered high concentrations at Alki Beach and Three Tree Point.  Image taken at Three Tree Point.
San Diego Dorid - NOT
Diaulula odonoghuei
Typical size: 2-4” length
ID: Dorid shaped smooth white body with dense small black  patches  extending to the mantle. White branchial plume.
Comments: This species is sometimes called a San Diego dorid, but it really is a different species that has not been given a couple name.   I note these dorids on hard and soft substrates.   They often patrol the vegetation along the guide lines throughout Edmonds Underwater Park. 


Pomegranate_Nudibranch
Red Nudibranch
San Diego Dorid
Sea Lemon
Shaggy Mouse Nudibranch
Spotted Aglajid
Striped Nudibranch
Verrucose Aeolid
White Dendronotid
White Lined Dirona
Yellow_Dorid
Shaggy Mouse Nudibranch
Aeolidia papillosa
Typical size: 1-3” length
ID: Two distinct rows of dense cerata.  White/crθme colored body, often with purple or grey on top (but not always).  Cerata start in front of rhinophores.
Comments:  Note how different this example of a shaggy mouse nudibranch is compared to the one above, showing how different physical characteristics can be even within the same species.  I found this and dozens of similar nudibranchs feeding on anemones at KVI Tower Reef in 9 feet of water.

Shaggy Mouse Nudibranch
White Lined Dirona
Dirona albolineata
Typical size: 2-5” length
ID: Semi-translucent white or lavender colored body with triangular shaped cerata edged in bright white.
Comments:  This amazing looking nudibranch is commonly sighted by divers in Northwest waters.  It seems at home on soft and hard substrates.  Although typically predominately white, this nudibranchs diet can effect body color.  Photograph taken at Three Tree Point in Central Puget Sound.
Bi-colored Nudibranch
Janolus fuscus
Typical size: 1-2” length
ID: Translucent white body. Densely packed pointed cerata with maroon center and tipped w/yellow & white. 
Image location:
God's Pocket, Hurst island BC
Comments:
  Although fairly common, this striking nudibranch is always a favorite find.  I regularly spot large specimens at Three Tree Point in spring on broadleaf kelp from shallow depths to over 90 feet deep. Don't confuse this nudibranch with the much less common frosty-tipped nudibranch.

Cockerell’s Dorid
Laila cockerelli
Typical size: 0.75-1” length
ID: White body. Dorid shape with distinctive orange tipped papilla.  Rhinophores tipped in red.  
Image location: Strawberry Island, SJI
Comments: The Cockerell's dorid is a super cool looking nudibranch with its bright white body,  bulbous bright orange papilla, rhinophors, and sometimes spots.  These is not an overly common nudibranch, but I note them fairly regularly at Keystone Jetty and at various sites through out the San Juans.  They seem to like current.

Dall’s Dendronotid
Dendronotus dalli
Typical size: 3-5” length
ID: White or pinkish-white body with six or seven rows of white tipped gill tufts that are heavily branched and tipped in bright white.
Comments:  I usually note this nudibranch around invertebrate rich rocky reef areas in the San Juan Islands.  Like the lion and giant nudibranch, this nudibranch is capable of swimming.  This species is easily confused with the white dendronotid.  Photo taken at Long Island in the San Juan Islands.
Giant White Dorid
Doris odhneri
Typical size
: 2-8” length
Distinctive markings:  Dorid shaped white body with no color markings.  Medium sized tubercles over entire body.  White rhinophores and branchial plume on rear.
Comments:  I frequently note this nudibranch in large numbers at certain sites in the San Juan Islands. This picture was taken at Lawrence Point on Orcas Island.  I have noted this species in a pale yellow color in the Hood Canal area.

Hudson Dorid
Acanthodoris hudsoni
Typical size: 1-2” length
ID:  White dorid shaped body covered in small white papillae tipped with yellow. Yellow margin. Long, prominent rhinophores.  Rhinophores and gill plume are white.
Comments:  A very common species that I have noted throughout all Washington waters around rocky reef areas and broadleaf kelp beds.  it is often confused with the Nainimo dorid which boasts rust colored rhinophores and branchial plume.

Golden Dirona
Dirona aurantia
Typical size: 2-8” length
Distinctive markings:  Dorid shaped white body with no color markings.  Medium sized tubercles over entire body.  White rhinophores and branchial plume on rear.
Comments:  I frequently note this nudibranch in large numbers at certain sites in the San Juan Islands. This picture was taken at Lawrence Point on Orcas Island.  I have noted this species in a pale yellow color in the Hood Canal area.

Lion Nudibranch
Melibe leonina
Typical size: 3-8” length
ID: Translucent white or yellowish brown body, sometimes with white spots.  Large frontal hood that can be extended to trap food drifting in the current.  Cerata are disk shaped. 
Comments: I only note the lion nudibranch in summer and fall amidst eel-grass and broadleaf kelp beds at depths above 40 fsw.  This species swims by undulating its body as it drifts in the current.   Also referred to as a hooded nudibranch.

Monterey Dorid
Doris montereyensis
Typical size:  2-6” length
ID: Dorid shaped yellow body.  Yellow branchial plume and rhinophores.  Black spots on body that can extend onto tubercles.
Comments:  I commonly note this nudibranch on soft substrates.  This species is easily mistaken for a sea lemon nudibranch (Anisodoris nobilis) which has a white branchial plume and is usually a paler yellow.  I often find this species with sand on its dorsum.

Nanaimo Dorid
Acanthodoris nanaimoensis
Typical size: 1-3” length
Distinctive markings: White dorid shaped body covered with small papillae tipped in yellow. Branchial plume and rhinophores tipped in rust.
Comments: I commonly note the Nanaimo dorid around rocky reef areas.  This nudibranch is often mistaken for a Hudson's dorid which lacks the rust coloration on the rhinophores are branchial plume.  Nanaimo dorids are believed to primarily feed on bryozoans and ascidians.


Opalescent Nudibranch
Hermissenda crassicornis
Typical size: 0.5-3” length
ID: Densely packed long, narrow cerata tipped in orange.  Distinctive orange stripe on head.  Body color varies from light blue to white.
Comments:
One of the most picturesque of the nudibranch species in northwest waters.  I usually note very small specimens in our waters (less than 1 inch). The amount of orange color on the cerata can vary greatly.   This nudibranch feeds on hydroid, ascidians, and other invertebrates.


Orange Spotted Nudibranch
Triopha modesta
Typical size: 3-8”  length
ID: Elongaged white body with orange tipped gill tufts and rhinophores.
Comments: 
One of the most common nudibranch species  encountered when diving rocky reefs.  This robust nudibranch is also sometimes referred to as a clown nudibranch.   This species is reported to feed on various bryozoans.  Photo taken at Pile Point on the south side of San Juan Island.

Orange Peel Nudibranch
Tochuina gigantea
Typical size: 6-10” length
ID: Thick orange body with white margin and large tubercles tipped in white.  White "fringe"(gills) lines the top of the body. 
Comments: This nudibranch is one of the largest and most distincitive in Washington waters.  Unfortunately, it is also one of the rarest.  I only occasionally note this species in the Cape Flattery area on rocky reefs where sea strawberries (a favorite prey item) are present.  Photographed at Tatoosh Canyon near Cape Flattery.


Freckeled Pale Sea Lemon
Bi-colored Nudibranch
Cockerell's Dorid
Hudson Dorid
Dall's Dendronotid
Giant_White_Dorid
Golden Dirona
Lion Nudibranch
Monterey Dorid
Nanaimo Dorid
Opalescent Nudibranch
Orange Peel Nudibranch
Orange Spotted Nudibranch
Dendronotus_kamchaticus
Dendronotus kamchaticus
Dendonotus kamchaticus
Typical size: 1" length
ID: White highlighted branchial plumes, medium density. 
Image location: Lawson Bluff, Sucia Island, SJI
Comments:
This species is part of the reason I love diving.  It's not in many (any?) books!  According to nudibranch expert  Karin Fletcher, this species identified as a separate species in 2015 in Russia.  In appearance, it looks like a cross between Dentronotus albus and Dendronotus dalli

Click here for nudibranch related terms and facts
Heath's Dorid
Geitordoris heathi
Typical size: 23” length
Distinctive markings:  White or yellow dorid shaped body with tiny yellow brown or black specs.  Branchial plume on rear.
Comments:  I don't note this nudibranch often, but when I do it is usually in the San Juan Islands or Cape Flattery area.  This specimen was photographed at Cone Island in the Sa Juan Islands.

Heaths Dorid
Cooper’s Dorid
Aldisa cooperi
Typical size: 1-1.5” length
ID: Solid yellow-orange body with small black spots on the centerline of the dorsum.
Image location:  Tatoosh Canyon, Cape Flattery
Comments:   I have only noted this species once, but I suspect I could find this species if I targeted it.  Close inspection of encrusting sponges, which dominate parts of the Cape Flattery area, is a good place to start the search.  The tiny black dots are tell-tale for this species.  Sorry  - these two have camera shy branchial plumes.
Coopers Dorid
Pilose Doris
Acanthodoris atrogriseata
Typical size: 1-2”  length
ID: Small triangular papillae.  Long rhinophores that bend slightly  backwards.  White, brown, or gold body.
Comments: 
I only noted this nudibranch occasionally, most likely due to its small stature.  It seems to prefer habitat that is more exposed, like Tatoosh Canyon in the Cape Flattery area and Browning Wall in BC.  This nudibranch is usually only about an inch in len
gth, but this specimens was closer to  two inches. 
Pilose Doris
Bushy-Back Nudibranch
Dendonotus frondosus
Typical size: 1” length
ID: Dendrontid shape with defined spiral rhinophore tips.  Usually brown in color.
Image location: KVI Tower, Puget Sound
Comments:  This is a miniature version of the nudibranch below - the specimen below a much more robust copy found up north in BC.  I only occasionally note this nudibranch although they are not uncommon, most likely because they often look like a growth on broadleaf kelp and go undetected.
Bushy-Backed Nudibranch
Giant_Nudibranch
Giant Nudibranch
Dendronotus iris
Typical size: 4-10” length
ID: White or red dendronotid body with long, branching gill tufts. Large size
Image Location:  Pulali Point Wall, Hood Canal

Comments: One of the coolest PNW nudibranchs, this Dendronotus specializes in hunting tube-dwelling anemone and will rear  up and "dive" into the center of the anemone to attack. It is also a pelagic species and can "swim" by undulating its body.  Look for it where tube-dwelling anomies flourish on soft substrates.
California Berthella
Berthella californica
Typical size: 2-3” length
ID: White or orange rounded body with speckles.  No branchial plume.  Highlighted margin.  Two tubular shaped rhinophores. 
Image location: Flagpole, Hood Canal
Comments: These are very distinctive nudibranch with it's bright spots and two very close together tubular rhinophores.  Although not overly common, they are not rare.  I note them most often at Hood canal dive sites, and less often in the SJI and Neah Bay area.

California Berthella
Giant Nudibranch - juvenile
Giant Nudibranch - Juvenile
Dendronotus iris
Typical size: 2-3” length
ID: White or red dendronotid body with long, branching gill tufts. Large size
Comments: I have only once noted a juvenile Dendronotus iris.  The photograph was taken near the public beach access at Three Tree Point in 15 feet of water.  Ironically, I have never seen an adult version of this nudibranch at this site.   Note the tri-colored gill tufts.

Pink Nudibranch
Tritonia tetraquerta
Typical size: 5-8”  length
ID: Thick, pink, "square" body with frontal veil trimmed in white.  White fringe (gills) along top edges of body.
Comments: 
I only rarely find this species.  When I do find pink nudibranchs, it is always amidst orange seapens on sandy substrates.  Populations of this species have significantly declined over the last 10-15 years for
unknown reason.   Photographed at Alki Reef in Central Puget Sound.  Note the orange seapen.
Pink Nudibranch
Bushy-Back Nudibranch
Dendonotus frondosus
Typical size: 3” length
ID: Dendrontid shape with defined spiral rhinophore tips.  Usually brown in color.
Image Location: Quatsino, NW Vancouver Island
Comments:  Things often grow bigger up north, and that is the case with this particular nudibranch which  I imaged during a circumnavigation of Vancouver Island.  The  Canadian version of the nudibranch makes it's US relative (pictured above) look like it needs to find a few good meals.  Look in hydroid fields for this nudibranch.
Bushy-Backed Nudibranch
Red Flabellina
Pomegranate Aeolid
Cuthona punicea
Typical size: 1”  length
ID: Smooth rhinophores, lavender coloration to rhinophores with white markings.
Comments: 
This tiny nudibranch is exclusively associated with raspberry hydroids, which are currently only known to exist in the northeast Vancouver Island area.  Photograph taken near Pearse Island in the Johnstone Strait.

Three Lined Aeolid
Three Lined Aeolid
Orienthella trilineata
Typical size: 2”  length
ID: Three white lines run along the top of the body.  Red-colored cerate concentrated in isolated clumps.
Comments:  A rarely noted nudibranch that looks very similar to several others, including the red flabellina and verrucose aeolid.  I had to go to Browning Pass to find this specimen cruising the colorful invertebrates.

Modest Cadlina
Cadlina
Cadlina sp.
Typical size: up to 1.75” length
ID: Dorid shape, distinctive bright spots (yellowish-white) along margin that extend to rhinophores. 
Image location: Long Island Wall, SJI
Comments:  Another nudibranch I just don't note too often.  In fact Karin, can't positive ID this nudibranch from this image (hence it is listed as Cadlina sp.).  The bright white spots help differentiate it from the yellow margin nudibranch.  Unfortunately, this nudibranch wouldn't cooperate for a pic with it's branchial plume extended. 

Barnacle-Eating_Nudibranch
Barnacle-Eating Nudibranch
Onchidoris bilamellata
Typical size:  less than 1” length
ID: Rounded papillia on back, short rhinophores. Coloration can vary, but usually brown/yellow.
Image location: KVI Tower, Puget Sound
Comments: I don't note these nudibranchs often, but they are fairly common.  Their coloration their coloration and size allows them to blend in perfectly amongst a cluster of barnacles.  This little guy was trans versing broadleaf kelp in search of greener - or whiter - pastures and was, which made spotting it easy.
Stubby Nudibranch
Stubby Dendronotus
Dendronotus subramosus
Typical size: up to 1.5" length
ID:  Stubby body (lack of an extended exterior beyond the gills).  Tufted gills along back.  Typically found amongst its quarry as pictured here:  the ostrich plume hydroid
Comments:  I rarely note this nudibranch.  This specimen is unusually large at about 1.5" as it forages on ostrich plume hydoids.  Photographed at Pile Point on south San Juan Island.

Burrowing Aeolid
Cumaotus sp.
Typical size: 0.5"
ID: Translucent white body. Long, thin cerata tipped in white. 
Image location: Alki Beach, Puget Sound
Comments:
  This little bugger can be really hard to find.  Not only is it small, but it buries itself in the sand making burrowing aeolid recon dives essentially a "Mission Impossible".  I have only seen this nudibranch once, and it surfaced just long enough for a pic, then disappeared back in the sand.

Frosty-Tipped Nudibranch
Frosty-Tipped Nudibranch
Janolus gelidus
Typical size: 1-2” length
ID: Very similar to the bi-colored nudibranch, but missing the yellow coloration on the end of the cerata.  This species looks more opaque as well.
Image Location:  Redondo Beach, Puget Sound

Comments:  This cool little nudibranch is relatively scarce - II had more than 1000 Puget Sound dives before noting this species in the Salish Sea,   Then on this dive, I encountered 6 all in the same area.   I suspect  like many nudibranchs, they may be seasonal.
Acanthodoris_brunnea
Acanthodoris brunnea
Acanthodoris brunnea
Typical size: 0.5”  length
ID: Long cerata combines with bright white flecking throughout the body.
Image location: Redondo Beach, Puget Sound
Comments: That is a nudibranch?  Really?  Well, not really.  In reality it is two nudibranchs positioned mantle to mantle - and perhaps getting freaky with each other.  I have only noted this species once as they are tiny, not to mention my eyesight isn't what it used to be.

Tricolored_Nudibranch
Tri-color Nudibranch
Polycera tricolor
Typical size: 1”  length
ID: Striking yellow, black, and white color combination can;t really be mistaken for anything else.
Comments:  Although I have heard reports this nudibranch exists in parts of Calfornia, it is only found in Barkley Sound in the PNW.  Imagery taken in Rainy Bay in Barkley Sound, BC, Canada.

White_Adalaria
Knoutsodonta jannae
Knoutsodonta jannae
Typical size: upto 0.75” length
ID:  Bumps on the back are longer and club-shaped.  Lives in broads on broadleaf kelp.
Comments: This is another of the tiny white nudibranchs found in the PNW.  I only note this species on broadleaf kelp, often invested with kelp bryozoan.  Typically, if I can find one, I can find at least several others in relatively close proximity.  Photographed at Redondo Beach, Puget Sound.


Yellow Margin Nudibranch
Cadlina luteomarginata
Typical size: 2-3” length
ID: White body covered with prominent white tubercles tipped in yellow. Yellow margin around foot. White branchial plume.
Comments: Noted throughout Washington water on soft and hard substrates.  Compared to other nudibranch, the this species maintains a very flat profile.  Possession Poinf Fingers is a great place to find and observe the yellow margin nudibranch.  This is another species that is quick to retract its branchial plume when approached.


Yellow Margin Dorid
Red_Sponge_Nudibranch
Red Sponge Nudibranch
Rostanga pulchra
Typical size: 0.5” length
ID: Distinctive rhinophores!  Orange-red color, no spots.
Comments:  This is a tiny nudibranch that is typically found around red sponges, which it consumes.  Because it is the same color as the sponge, it can be very difficult to spot.  The image of this specimen was captured at Blakely Harbor Fingers, where there are no red sponges, so it obviously has a broader diet than it's name suggests.


Taylors_Sea_Hare
Taylor's Sea Hare
Phyllaplysia taylori
Typical size: 0.5-2”  length
ID: Flat bright green body with white and black stripes running lengthwise.
Comments:  It is hard to mistake this nudibranch for another species - except eelgrass.  The toughest part is spotting this cool looking nudibranch is it blends in perfectly with eelgrass blades.  Photographed in 15 feet of water at Alki Beach in Puget Sound.
San_Diego_Dorid2
San Diego Dorid
Diaulula sandiegensis
Typical size: 2-5” length
ID: Dorid shaped smooth white body with small black  patches or loops along the back. White branchial plume.
Comments: I find this species typically on hard substrates.  Until recently, this was considered the same species as Diaulula odonoghuei.  My experience is this species can grow much larger than Diaulula odonoghuei.


Doto_columbiana
Doto columbiana
Doto columbiana
Typical size: 0.5” length
ID: Very small, beaded branchial plumes. Black extends down the sides, not just on the back, and there is little to no white speckles/frosting on the rhinophores
Image location: Lawrence Point, Orcas Island, SJI
Comments:  Dotos often look like tiny bits of fuzz stuck on  hydroids.  Renowned nudibranch expert Karin Fletcher suspects this species is Doto columbiana, but with out examining any associated egg masses it is hard for certain.  Doto ID can be hard!
Diamond Back Nudibranch
Diamond Back Nudibranch
Tritonia festiva
Typical size: 2-5” length
ID: Elongated translucent white body.  Prominent  frontal veil.  Gill tufts aligned in rows along side of body.
Image location: Lawrence Point, Orcas Island, SJI

Comments: This is a super-cool looking nudibranch that has a wide variation of pattern on it back.  With it's flamboyant rows of gill tufts and elaborate back design - it just looks like a party animal.  These nudibranchs are often very common thought current swept rocky reefs in the SJI, although I seem them in Puget Sound as well.
A big "thank you" to Karin Fletcher for helping me keep this section current.  The scientific names of many of these nudibranchs seem to change very quickly.   Karin's insight into nudibranchs is unparalleled.  Thank you Karin!
Doto kya
Doto kya
Typical size: 0.5” length
ID:  Frosted and sheathed rhinoporesl, typivcslly no black specs on the back (although this specimen exhibits black spots).
Image location: Lawrence Point, Orcas Island, SJI

Comments:  Karin Fletcher believes this is Doto kya due to the rhinophore configuration, however Doto kya should not have black spots on the body.  I told you Doto ID is difficult at best as the distinguishing traits are not always distinguishing. 
Doto_kya
Porcupine_Dorid
Porcupine Dorid
Diaphorodoris lirulatocauda
Typical size: 0.5”  length
ID: Long, smooth rhinophore with white frosting, "spikey" cereta along body,.
Comments: 
Another tiny white dorid that will easily go unnoticed during a dive unless.  It helps this one is on a contrasting background.  This species is very similar to the pilose dorid, but with shorter rhinophores and a more opaque body.  Photographed in the San Juan Islands.