Crabs, Shrimp, Isopods, Amphipods, Barnacles

Crustaceans

The classification of these marine animals is complex, they encompass Crabs, Shrimps, Isopods, Amphipods, Barnacles and many many more.  The phylum Arthopoda (jointed legs) comprises more than 900,000 living species, making up more then three-quarters of all known species.


Alaskan Hermit Crab

Alaskan Hermit Crab

 
Alaskan Hermit Crab
Pagurus ochotensis
Alternate Name: Formerly Pagurus
alaskensis
Size: Carapace to 1 3/4 (5 cm) long
Range: Pribilof Islands, Alaska to Point Arena, California
Habitat: Mud or sand bottom, inter tidal to 1,275 ft (388m)
Description: Green – yellow eyes.  Granular claws and legs with iridescent sheen.
Comments: Similar to the black-eyed hermit, other than the eyes.  THis large hermit
also occupies the shells of Lewis’s moon snails.  The common name “Alaskan hermit”
has been retained from the earlier Latin species name alaskensis.  Confusion can
occur when geographical references are used for Latin or common names.


Bering Hermit Crab

Bering Hermit Crab
Bering Hermit Crab

 

Bering Hermit Crab

Bering Hermit Crab:
Pagurus berginganus
Size: Carapace to 1″ (2.5 cm) long
Range: Bering Sea and Aleutian Islands to Monterey, California
Habitat: In rocky areas, inter-tidal to 1,195′ (364m)
Description: Walking legs pale blue grey with red bands and spots. Brown claws with red bumps and spines.
Comments: Prefers a large, heavy shell. Often found in shell of the frilled dogwinkle some times in hermit crab sponge.



Longhorn Decorator Crab

Northern Kelp Crab
Northern Kelp Crab

Longhorn Decorator Crab: Decorator crab
Chorilia longipes
Size: Carapace to 13/4inchs (4.5 cm) wide
Habitat: On rocks and boulders, shallow subtidal 30 – 3,900 feet ( 9 – 170m)
Description: Spiny, pear-shape carapace with 2 divergent horns. Pale orange, often with banded legs.
Comments: Often decorated and confused with the smaller slender decorator crab.


Rough Patch Shrimp

Rough Patch Shrimp
Rough Patch Shrimp, taken at Kelvin’s Grove
Rough Patch Shrimp
Rough Patch Shrimp, taken at Kelvins Grove

Rough Patch Shrimp
Pandalus stenolepis
Size: to 8.3 cm (3.4 in) long
Range: Northern Alaska to Oregon
Habitat: subtidal, 1- 228m (60 -750ft)
Description: Often confused with the dock shrimp but the rough patch shrimp has more distinct blue dots on the back and lacks the diagonal markings on the abdomen.


Giant Acorn Barnacles

Giant Acorn Barnacle, taken at Whytecliff Park
Giant Acorn Barnacle, taken at Whytecliff Park
Giant Acorn Barnacle, taken at Whytecliff Park
Giant Acorn Barnacle, taken at Whytecliff Park

Giant Acorn Barnacle
Balanus nubilus
Common Names: giant barnacles, horse barnacles
Size: to 15 cm (6in) across
Range: Alaska to Mexico
Habitat: Intertidal to 91m (300ft)
Description: This barnacle may be solitary or may aggregate, forming huge, reef-like structures.  Its obvious pink cirri (claw-like feeding structures) protrude when the creature feeds.  Many animals may hide in the empty casings after barnacles perish.  Some fish species after the barnacles perish.  Some fish species deposit eggs in these cavities.


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