Metacarcinus gracilis Metacarcinus gracilis
                                                       juvenile




Pinnixa littoralis
found in a Tresus capax siphon
Pinnixa littoralis
Holmes, 1894

Gaper Pea Crab

occasionally found, less common
than P. faba in the Northwest,
north Mexico to central Alaska












Citation:  Pacific Northwest Shell Club, www.PNWSC.org
Home > Northwest Shells & Marine Life > PNW Shells & Marine Life Photos > Crustaceans

















Balanus rostratus
Balanus rostratus Hoek, 1883
Rostrate Barnacle
usually only found subtidally;
Washington to north Alaska, Japan


Balanidae
Balanus glandula
Balanus glandula Darwin, 1854
Common Acorn Barnacle
common, north Mexico to north Alaska

Chthamalidae
Chthamalus dalli
Chthamalus dalli Pilsbryi, 1916
Small Acorn Barnacle
common, south California to north Alaska

Balanus nubilus Balanus nubilus
Balanus nubilus Darwin, 1854
Giant Acorn Barnacle
common, north Mexico to south Alaska




Barnacles  

Archaeobalanidae
Semibalanus cariosus Semibalanus cariosus
Semibalanus cariosus (Pallas, 1788)
Thatched Acorn Barnacle
common, south California to north Alaska, Japan

Crustaceans

(Oregon to Southeast Alaska)

Click on photo to enlarge.  Scale line in photo equals 1cm unless otherwise specified.

Notations refer to how often they can be found intertidally by
beachgoers in the Northwest plus their full habitat range.  












Cancer productus Cancer productus Cancer productus Cancer productus
             adult                              male & female                              juveniles are variable in color and pattern
Cancer productus Randall, 1840
Red Rock Crab
common, north Mexico to central Alaska  -  can deliver a nasty pinch!

Crabs - True Crabs  




Scalpellidae
Pollicipes polymerus
Pollicipes polymerus (Sowerby, 1833)
Goose-Neck or Leaf Barnacle
common, north Mexico to south Alaska







Cancridae
Cancer antennarius
Cancer antennarius Stimpson, 1856
Pacific Rock Crab
common on the exposed coast, north Mexico
to north B.C.

















 Hemigrapsus oregonensis
Hemigrapsus oregonensis
(Dana, 1851)

Green Shore Crab
common, north Mexico
 to south Alaska

Grapsidae
Hemigrapsus nudus Hemigrapsus nudus Hemigrapsus nudus
                                                                                   a green form
Hemigrapsus nudus (Dana, 1851)
Purple Shore Crab
common, north Mexico to south Alaska


Epialtidae
Pugettia gracilis Pugettia gracilis Pugettia gracilis
Pugettia gracilis Dana, 1851
Graceful Kelp Crab
common, north Mexico to north Alaska



Oregoniidae
Oregonia gracilis Oregonia gracilis Oregonia gracilis Oregonia gracilis Oregonia gracilis
Oregonia gracilis Dana, 1851
Graceful Decorator Crab
common; central California to north Alaska, Japan

Metacarcinus magister Metacarcinus magister Metacarcinus magister Metacarcinus magister
                                                          a female brooding its eggs                                               juveniles                                        male holding female
Metacarcinus magister (Dana, 1852)
Dungeness Crab
common, north Mexico to north Alaska


Metacarcinus gracilis (Dana, 1852)
Graceful Crab
common, north Mexico to central Alaska
Lepadidae
Lepas anatifera
Lepas anatifera Linnaeus, 1758
Pelagic Goose-Neck Barnacle
lives at sea attached to flotsam,
often found washed ashore







































Pinnotheridae
 Pinnixa faba
 found inside a Tresus capax
Pinnixa faba (Dana, 1851)
Mantle Pea Crab

common - but usually inside the Tresus shell,
south California to south Alaska

Panopeidae
Lophopanopeus bellus Lophopanopeus bellus
                                        a female brooding its eggs
Lophopanopeus bellus (Stimpson, 1860)
Black-Clawed Crab
common, south California to south Alaska

Cheiragonidae
Telmessus cheiragonus Telmessus cheiragonus Telmessus cheiragonus
                                                                                             male holding female
Telmessus cheiragonus
(Tilesius, 1812)

Helmet Crab
occasionally found; central California to
 north
Alaska, also Siberia, Japan & Korea


Porcelain Crabs






Pugettia producta
Pugettia producta (Randall, 1840)
Northern Kelp Crab
common, north Mexico to south Alaska










Lithode Crabs



Lopholithodes mandtii
juvenile
Lopholithodes mandtii (Brandt, 1849)
Puget Sound King Crab
uncommon and subtidal,
central California to
south Alaska
This is a protected species.

















Pinnixa sp.
Pinnixa comparison
These are two male Pinnixa.
Note that the longest segment
of the third walking leg is fatter
on the P. littoralis than on the
much larger P. faba.

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Idoteidae
Idotea resecata
Pentidotea resecata (Stimpson, 1857)
Eelgrass Isopod
common, north Mexico to central Alaska




This page last revised: 6-24-2017



Hermit Crabs


Paguridae
Elassochirus tenuimanus Elassochirus tenuimanus
        in a Neptunea lyrata           in a Fusitriton oregonensis
Elassochirus tenuimanus (Dana, 1851)
Widehand Hermit Crab
infrequently found, north Washington to north Alaska







Phyllolithodes papillosus
found subtidally
Phyllolithodes papillosus Brandt, 1848
Heart Crab
occasionally found, usually subtidal
southern California to the Aleutians


Cryptolithodes typicus
Cryptolithodes typicus Brandt, 1848
Butterfly Crab
occasionally found, usually subtidal
southern California to Aleutian Islands, AK


Pagurus granosimanus Pagurus granosimanus
using a crab claw for a shell     currently without a shell
Pagurus granosimanus

(Stimpson, 1858)
Grainyhand Hermit Crab
common, northern Mexico to central Alaska
This speciman on the left is using the claw of a
Pagurus hirsutiusculus for its home. This species usually prefers a tiny shell for its home.






Lithodidae
Cryptolithodes sitchensis
Cryptolithodes sitchensis Brandt, 1853
Umbrella Crab
occasionally found, prefers more open coast and usually subtidal, south California to south Alaska























Pagurus hirsutiusculus Pagurus hirsutiusculus
 in a Boreotrophon clathratus      all juveniles       in a Haminoea vesicula
Pagurus hirsutiusculus (Dana, 1851)
Hairy Hermit
common, south California to north Alaska
This species prefers a large shell that seems too big to manage.





Pagurus holmi Pagurus holmi
      in a Littorina scutulata
Pagurus holmi
Ng & McLaughlin, 2009

uncommon, known only from Puget Sound
This species was discovered by members of
the PNWSC during a field trip in May 2008.


 Isopods


Pagurus armatus Pagurus armatus
Pagurus armatus (Dana, 1851)
Blackeyed Hermit Crab
infrequently found, south California to north Alaska

Paralithodes camtschaticus
juvenile found at very low tide in Alaska
Paralithodes camtschaticus
(Tilesius, 1815)
Red King Crab or Alaska King Crab
subtidal, north BC to north Alaska,
Japan & Siberia

Oedignathus inermis
Oedignathus inermis (Stimpson, 1860)
Granular Claw Crab
occasionally found; central California to
central
Alaska, also Japan, Korea and Siberia

 







Hippolytidae
Heptacarpus brevirostris Heptacarpus brevirostris
Heptacarpus brevirostris (Dana, 1852)
Stout Shrimp
very common, south California to north Alaska

Shrimp












































Pentidotea stenops
Pentidotea stenops  (Benedict, 1898)
Seaweed Isopod
common, north Mexico to south Alaska






















Pandalidae
Pandalus danae
Pandalus danae Stimpson, 1857
Dock Shrimp
common, south California to Alaska


Crangonidae
Crangon nigricauda Crangon nigricauda
                                                                            female with eggs
Crangon nigricauda Stimpson, 1856
Blacktail Shrimp
common, north Mexico to central Alaska

























Porcellanidae
Petrolisthes cinctipes Petrolisthes cinctipes
Petrolisthes eriomerus Stimpson, 1871
Flattop  Crab
occasionally found, south California to south Alaska