Description: The carapace of this small
hermit crab is smooth (without dorsal spines), the lateral parts are covered
with soft setat, and only part of it is calcified. Eyescales have
no deep median furrow, and their base is not covered by the carapace.
Leg 4 is subchelate. Abdomen coiled, right cheliped is nearly as
long as the walking legs and its carpus is longer than wide. The
left cheliped is smaller than right but similar in structure. Both
chelipeds are greenish-brown and gray, often with orange tips. The
merus of both chelipeds is brown and gray with a dull white or yellowish
distal band. The merus of the chelipeds often have orange-tipped
spines. Dactyls of legs 2-3 not twisted. The carpus of the
right (but not left) second pereopod (first walking leg) is serrated.
Dorsal surface of propodus of left chela with neither a prominent ridge
or crest nor a concavity. Ventral surface of merus of right cheliped
with 1or 2 prominent tubercles. Chelae with irregular rows of stout
spines along with long tufted setae. Antenna 2 reddish brown without
white spots. Has a white band at the articulation of dactyl and propodus
on legs 2 & 3. Carapace length to 1 cm. Carapace is light
gray and cream with lengthwise purple stripes, each of which has light
dots. The abdomen is purple and gray.
Pagurus caurinus Hart, 1971
Common name(s): Greenmark hermit
|Synonyms: Pagurus setosus
|Pagurus caurinus (underwater)
|(Photo by: Aaron Baldwin)
How to Distinguish from Similar Species: P.
hirsutiusculus also has 1 prominent tubercle on the ventral surface
of the merus of the right cheliped and white (or bluish) bands between
the propodus and dactyl on legs 2-3 but the tubercle is often obscure plus
the chelae have closely spaced tubercles & granules instead of spines.
Its second antennae are green with white spots. Pagurus hemphilli
has orange-red antenna 2 and no white band between the propodus and dactyl
of legs 2-3.
Geographical Range: Port Gravina,
Alaska to Los Angeles (rare in California)
Depth Range: Mostly subtidal to 126
m, occasionally intertidal in cold waters on outer coast.
or sandy, exposed or sheltered
Biology/Natural History: This species
is common in the Puget Sound region but most are so small they are assumed
to be juveniles of other species such as P.
1952 (as P. setosus)
General Notes and Observations: Locations, abundances,
Authors and Editors of Page:
Dave Cowles (2006): Created original page